GF Signet 8750-2 Manual - User Manual

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pH/ORP

10.20 pH

25.0

Relay 1

Relay 2

ENTER

‡ SIGNET

8750-2 pH/ORP Transmitter

ENGLISH

Specifications

General

Compatible electrodes: +GF+ SIGNET Twist-Lock 3-2720 pH/ORP

Preamplifier/3-271X Electrodes

Accuracy:

0.03 pH,

2 mV's ORP

Enclosure:
•

Rating:

NEMA 4X/IP65 front

•

Case:

PBT

•

Panel case gasket: Neoprene

•

Window:

Polyurethane coated polycarbonate

•

Keypad:

Sealed 4-key silicone rubber

•

Weight:

Approx. 325g (12 oz.)

Display:
•

Alphanumeric 2 x 16 LCD

•

Contrast: User selected, 5 levels

•

Update rate: 1 second

Electrical

Power: 12 to 24 VDC

10%, regulated, 220 mA max.

Sensor input range:
•

pH: 0.00 to 14.00 pH

•

Temp. (pH only) 3K Balco, -25 to 120

C (-13 to 248

•

ORP: -1000 to +2000 mV, isolated
(10K

Ω

I.D. resistance T+, T-)

Current output:
•

4 to 20 mA, isolated, fully adjustable and reversible

•

Max loop impedance:

Ω

max. @ 12 V

325

Ω

max. @ 18 V

600

Ω

max. @ 24 V

•

Update rate: 0.5 seconds

•

Accuracy:

0.03 mA @ 25

C, 24 V

Relay outputs (2 sets mechanical SPDT contacts):
•

Maximum voltage rating: 5 A @ 30 VDC, or 5 A @ 250 VAC
resistive load

•

Hi or Lo programmable with adjustable hysteresis

•

Pulse programmable (maximum 400 pulses/minute)

Environmental

•

Operating temperature:

-10 to 70

C (14 to 158

•

Storage temperature:

-15 to 80

C (5 to 176

•

Relative humidity:

0 to 95%, non-condensing

•

Maximum altitude:

2000 m (6562 ft)

•

Insulation category:

•

Pollution degree:

Standards and Approvals

•

CSA, CE, UL listed

•

Immunity:

EN50082-2

•

Emissions:

EN55011 Class B

•

Manufactured under ISO 9001 and ISO 14001

3-8750.090-2

D-4/03 English

CAUTION!

•

Remove power to unit before wiring input and
output connections.

•

Follow instructions carefully to avoid personal injury.

Installation

ProcessPro transmitters are available in two styles: panel mount and field mount. The panel mount is supplied with the necessary
hardware to install the transmitter. This manual includes complete panel mounting instructions.
Field mounting requires a separate mounting kit. The 3-8050 Universal kit enables the transmitter to be installed virtually
anywhere. Detailed instructions for field installation options are included with the 3-8050 Universal kit.

1.1 Panel Installation

The panel mount transmitter is designed for installation using a 1/4 DIN Punch. For manual panel cutout, an adhesive
template is provided as an installation guide. Recommended clearance on all sides between instruments is 1 inch.

Place gasket on instrument, and install in panel.

Slide mounting bracket over back of instrument until quick-clips snap into latches on side of instrument.

To remove, secure instrument temporarily with tape from front or grip from rear of instrument. DO NOT RELEASE.
Press quick-clips outward and remove.

Contents

1. Installation
2. Specifications
3. Electrical Connections
4. Menu Functions

106 mm (4.2 in.)

42 mm

(1.7 in.)

64 mm

(2.5 in.)

SIDE VIEW

92 mm
(3.6 in.)

97 mm

(3.8 in.)

56 mm
(2.2 in.)

41 mm
(1.6 in.

)

Optional
Rear
Cover

Field Mount

Panel Mount

FRONT VIEW

96 mm

(3.8 in.)

96 mm
(3.8 in.)

quick-clips

gasket

panel

terminals

mounting

bracket

latch

Out

put

Out

put

Sys

tem

Loo

p -

Sys

tem

Loo

p +

Sen

sr G

(SH

IELD

)

Sen

sr IN

(RE

Sen

sr V

(BLA

CK)

SIDE VIEW

Field Mount &

Panel Mount

Panel Mount
Installation Detail

82 mm
(3.23 in.)

8050

page 2 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

System Pwr

Loop -

System Pwr

Loop +

AUX

Power -

AUX

Power +

Earth

GND

Sensr Gnd

(SHIELD)

V-

(BLACK)

V+

(RED)

Temp -

(WHITE)

Temp +

(GREEN)

Iso. GND

(BLUE)

mV Input

(BROWN)

Relay 2

(NO)

Relay 2

(COM)

Relay 2

(NC)

Relay 1

(NO)

Relay 1

(COM)

Relay 1

(NC)

Electrical Connections

Caution:

Failure to fully open terminal jaws before removing wire may permanently damage instrument.

Wiring Procedure

Remove 0.5 - 0.625 in. (13-16 mm) of insulation from wire end.

Press the orange terminal lever downward with a small screwdriver to open terminal jaws.

Insert exposed (non-insulated) wire end in terminal hole until it bottoms out.

Release orange terminal lever to secure wire in place. Gently pull on each wire to ensure a good connection.

Wiring Removal Procedure

Press the orange terminal lever downward with a small screwdriver to open terminal jaws.

When fully open, remove wire from terminal.

Wiring Tips:

•

Do not route sensor cable in conduit containing AC power wiring. Electrical noise may interfere with sensor signal.

•

Routing sensor cable in grounded metal conduit will help prevent electrical noise and mechanical damage.

•

Seal cable entry points to prevent moisture damage.

•

Only one wire should be inserted into a terminal. Splice double wires outside the terminal.

Terminals 15-18: Sensor connections

15-16 are mV (pH or ORP) input from the electrode.
17-18 are temperature input from the pH electrode or
10K

Ω

identifying resistor from the ORP electrode.

Terminals 11-14: Preamplifier power and grounds

11-12 are DC voltages from the 8750 to power the

preamplifier.

13-14 are ground terminals for the sensor and for

earth ground

Terminals 1 and 2: AUXILIARY power

Provides power for relay operation.

Terminals 5-10: Relay Outputs

Two sets mechanical SPDT contacts,
programmable (see CALIBRATE menu) as:

• High or Low with adjustable hysteresis
• proportional pulse based on pH or ORP
• May be disabled (Off) if not used.

Terminals 3 and 4: Loop Power

12-24 VDC

10% system power

and current loop output.

Max. loop impedance:

Ω

max. @ 12 V

325

Ω

max. @ 18 V

600

Ω

max. @ 24 V

page 3 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

3.2 System Power/Loop Connections

Stand-alone application, no current loop used

Transmitter

Terminals

Power

Supply

12–24 VDC

Connection to a PLC with built-in power supply

Internal

PLC Connection

Connection to a PLC/Recorder, separate supply

Example: Two transmitters connected to PLC/Recorder with separate power supply

–

PLC or Recorder

Loop Input

4-20 mA

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

Transmitter

Terminals

Power

Supply

12–24 VDC

–

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

+
–

AUX power required for all 8850 systems

PLC or Recorder

Channel 1
4-20 mA in

Channel 2
4-20 mA in

+
–

–

Transmitter 1

Terminals

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

Transmitter 2

Terminals

PLC Terminals

Loop Input

4-20 mA

Transmitter

Terminals

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

+
–

Power

Supply

12–24 VDC

–
+

Power

Supply

12–24 VDC

–

18
17
16
15
14
13
12
11

White (Temp)
Green (Temp)
Blue (ISO GND)
Brown (mV input)

Silver (Shield)
Black (V-)
Red (V+)

Preamp:

+GF+ SIGNET 2720

pH Electrodes

+GF+ SIGNET 2714, 2714-HF
+GF+ SIGNET 2716

ORP Electrodes:

+GF+ SIGNET 2715
+GF+ SIGNET 2717

* (connection of terminal 14 to Earth GND

may reduce electrical interference)

Terminals

3.1 Sensor Input Connections

Transmitter

≤ 400 ft. (122 m)

pH/ORP

page 4 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

VIEW menu

•

During normal operation, ProcessPro displays the VIEW menu.

•

When using the CALIBRATE or OPTIONS menus, ProcessPro will return to the VIEW menu if no activity
occurs for 10 minutes.

•

To select the item you want displayed, press the UP or DOWN arrow keys. The items will scroll in a
continuous loop. Changing the display selection does not interrupt system operations.

•

No key code is necessary to change display selection.

•

Output settings cannot be edited from the VIEW menu.

Hysteresis

Time

Low Setpoint

Process

Relay energized

Relay relaxed

Hysteresis

Time

High Setpoint

Process

pH/ORP

10.20 pH

25.0

Relay 1

Relay 2

ENTER

•

Proportional Pulsing

The relay output will generate a 100 mS pulse at the rate defined
by settings in the CALIBRATE menu (see page 6)

In the example below:
•

The output will be 0 pulses/min. at pH values less than 5.0.

•

The output will be 50 pulses/min. at 7.5 pH.

•

The output will be 100 pulses/min. at pH values above 10 pH.

3.3 Open Collector Output

The relay outputs can be programmed to respond when the pH/
ORP value moves above or below a setpoint, or it can be used to
generate a pulse that is proportional to the pH/ORP value.
The relays can be disabled if not in use.

•

Low

Relay triggers when the pH/ORP

s less than the setpoint.

The relay will relax when the pH/ORP moves above the setpoint
plus the hysteresis value.

•

High

Relay triggers when the pH/ORPis greater than the setpoint.
The relay will relax when the pH/ORP drops below the setpoint
plus the hysteresis value.

Rela

y Output Rate:

0 to 100 Pulses/min.

endpoint

Pulse rate

0 pulses

100 pulses

Starting point

7.00

12.6

Monitor the Temperature input from the sensor.
This is the Permanent display.

All of the VIEW displays below are temporary. The permanent display will return after ten minutes.

Input:

307 mV

Loop Output:

14.16 mA

Last CAL:

06-30-00

EASY
CAL:

Monitor the millivolt input from the electrode. Use this display to determine the
relative condition of your electrode during periodic calibration.
(7 pH buffer = 0 mV,

50 mV)

Monitor the 4-20 mA Loop output.

Monitor date for scheduled maintenance or date of last calibration.

Easy Cal is the fastest and simplest periodic calibration method. Requires
4 pH, 7 pH and 10 pH. (Any two)

View Menu for pH

Display

Description

page 5 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

Notes on Steps 5 and 6:

• All output functions remain active during editing.
• Only the flashing element can be edited.
• RIGHT ARROW key advances the flashing element in a continuous loop.
• Edited value is effective immediately after pressing ENTER key.
• If no key is pressed for 10 minutes unit will restore the last saved value and return to step 3.
• Step 6 (pressing ENTER key) always returns you to Step 3.
• Repeat steps 3-6 until all editing is completed.

Notes on Step 2:

If no key is pressed for 5 minutes while display is showing "Enter
Key Code", the display will return to the VIEW menu.

Notes on Steps 3 and 4:

• Refer to pages 6 and 7 for complete listing of menu items and their use.
• From the Step 3 display, pressing the UP and DOWN keys simultaneously will
return the display to the VIEW menu.
• If no key is pressed for 10 minutes, display will also return to the VIEW menu.

ProcessPro Editing Procedure:

Step 1.

Press and hold ENTER key:

• 2 seconds to select the CALIBRATE menu
• 5 seconds to select the OPTIONS menu.

Step 2.

The Key Code is UP-UP-UP-DOWN keys in sequence.

• After entering the Key Code, the display will show the first item in the selected menu.

Step 3.

Scroll menu with UP or DOWN arrow keys.

Step 4.

Press RIGHT ARROW key to select menu item to be edited.

• The first display element will begin flashing.

Step 5.

Press UP or DOWN keys to edit the flashing element.

• RIGHT ARROW key advances the flashing element.

Step 6.

Press ENTER key to save the new setting and return to Step 3.

OPTIONS

CALIBRATE

VIEW

Press &
hold for
access:

ENTER

Step 5

Step 6

Notes on Step 1:

• The View Menu is normally displayed.
• The CALIBRATE and OPTIONS menus require a KEY CODE.

Step 4

First item in
CALIBRATE menu

Step 3

Step 3: Finished Editing?

Press the UP and DOWN keys simultaneously after
saving the last setting to return to normal operation.

Press the UP and DOWN keys simultaneously
while any element is flashing. This will recall the
last saved value of the item being edited and
return you to Step 3.

Step 5: Made an Error?

CALIBRATE: ----

Enter Key Code

CALIBRATE: *---

Enter Key Code

CALIBRATE: **--

Enter Key Code

CALIBRATE: ***-

Enter Key Code

Temperature >

Set:

10.0 pH >

Relay1 Setpnt:

Temperature >

Set:

Relay1 Setpnt:

0.00 pH

Relay1 Setpnt:

0.00 pH

ENTER

Relay1 Setpnt:

.00 pH

Relay1 Setpnt:

.00 pH

Relay1 Setpnt:

Saving

Relay1 Setpnt:

9.00 pH >

page 6 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

Provides a maximum 25ºC offset to match temperature measurement to external reference.

Applies a linear offset to the pH measurement. The ideal value is the average pH of your
application. (A sample of your application at process temperature is recommended.)

Applies a slope to the pH measurement. The slope value and the standard value must be
at least 2 pH units apart. The ideal values are the minimum and maximum values of your
process.

Select the minimum and maximum values for the 4-20 mA Current loop output.

Select pH or Temperature as the source for this relay.

Select the mode of operation for this relay: High, Low or proportional Pulse.
The signal may be disabled if not in use.

In Low or High Mode, the relay will be activated when the pH reaches this value.

In Low or High mode, the relay will be deactivated at Setpoint

Hysteresis, depending on

High or Low Setpoint selection. (See details on page 4.)

If Relay 1 is in PULSE mode, set the start and end point of the range and also set the
maximum pulse rate. (The maximum PULSE rate setting is 400 pulses per minute.)

The combined Relay1 Range and Relay1 Pulse rate settings shown here indicate:
"Start pulsing when the pH value is 4 and increase the pulse rate up to the maximum of
120 pulses per minute when the pH value reaches 8"

Use this “note pad” to record important dates, such as annual recertification or scheduled
maintenance.

Set:

Temperature

Set:

Standard

Set:

Slope

Loop Range: pH

0.00

→

14.00

Relay1 Source:

Relay1 Mode:

Off

Relay1 Setpnt:

4.00 pH

Relay1 Hys:

0.51 pH

Relay1 Range:

4.00

→

8.00

Relay1 PlsRate:

120 Pulses/min

Last CAL:

06-30-01

Calibrate Menu for pH

Display

(Factory settings shown)

Description

page 7 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

Adjust the LCD contrast for best viewing. A setting of 1 is lower contrast, 5 is higher.
Select lower contrast if the display is in warmer ambient surroundings.

OFF provides the most instantaneous output response to changes in input value.
LOW averaging = 4 seconds, HIGH averaging = 8 seconds of input signal.

Select temperature units: ºC or ºF.

Adjust the minimum and maximum current output. The display value represents the
precise current output.
Adjustment limits:
• 3.80 mA < 4.00 mA > 5.00 mA
• 19.00 mA < 20.00 mA > 21.00 ma
Use this setting to match the 8750 loop output to any external device.

Press UP or DOWN keys to manually order any output current value from 3.6 mA to
21.00 mA to test current loop output.

Press UP or DOWN keys to manually toggle the state of the relay output.

Contrast:

Averaging:

Off

Temp Display:

Loop Adjust:

4.00 mA

Loop Adjust:

20.00 mA

Test Loop:

Test Relay 1:

Test Relay 2:

Options Menu for pH

Display

(Factory settings shown)

Description

EASY CAL Procedure - pH

•

This procedure simplifies system calibration using standard 4.0, 7.0, 10.0 pH buffers only. If these pH buffers are not available,
calibrate the system via the CALIBRATE menu, using the STANDARD and SLOPE settings.

•

Access the CALIBRATE menu and set sensor temperature before performing EASY CAL for new electrode installations.

•

Access EASY CAL menu from the view menu.

Theoretical mV values
pH @ 25

+296

+237

+177

+118

+59

-59

-118

-177

-237

-296

To Calibrate:

Response:

To Accept:

Place electrode tip in
first pH buffer
pH 7.0 = 0 mV
pH 4.0 = 177
pH 10 = -177
Limit ± 50 mV

Allow for stabilization

to accept

Place electrode tip
in second pH buffer.

Allow for stabilization

Press to accept
second buffer calibration.

ENTER

* 7.00 pH

-005 mV

* 6.90 pH

-005 mV

* 3.93 pH

+179 mV

30 seconds*

Press UP, UP, UP, DOWN buttons in sequence to enter menu,

XXXX will appear during code entry.

EASY CAL: ----
Enter Key Code

Place Sensor in

pH Buffer #1

Place Sensor in

pH Buffer #2

* 6.90 pH

-005 mV

* 3.93 pH

+179 mV

* 4.00 pH

+179 mV

_ _ _ _

To exit menus and return to
VIEW press UP and DOWN
button at the same time

Display returns to VIEW
Menu in 10 minutes or
when ENTER is pressed

Good Easy Cal
Press <ENTER>

page 8 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

Applies a linear offset to the ORP measurement. If you are using a single-point calibration,
use this function. The ideal value is the average pH of your application. (A sample of your
application at process temperature is recommended.)

Applies a slope to the ORP measurement. This function should only be used in a two-point
calibration. The slope value and the standard value must be at least 2 pH units apart. The
ideal values are the minimum and maximum values of your application.

Select the minimum and maximum ORP values for the 4-20 mA Current loop output.
Maximum settings are -1000 mV to +2000 mV.

Select the mode of operation for this relay: High, Low or proportional Pulse.
The signal may also be disabled if not in use.

In Low or High Mode, the relay will be activated when the ORP reaches this value.

In Low or High mode, the relay will be deactivated at Setpoint

Hysteresis, depending on

High or Low Setpoint selection. (See details on page 4.)

If Relay 1 is in PULSE mode, set the start and end point of the range and also set the
maximum pulse rate. (The maximum PULSE rate setting is 400 pulses per minute.)

The combined Relay1 Range and Relay1 Pulse rate settings shown here indicate:
"Start pulsing when the ORP value is -500 and increase the pulse rate up to the maximum
of 120 pulses per minute when the ORP value reaches +500"

Use this “note pad” to record important dates, such as annual recertification or scheduled
maintenance.

Calibrate Menu for ORP

Display

(Factory settings shown)

Description

Set:

Standard

Set:

Slope

Loop Range: mV

-1000 > +1000

Relay1 Mode:

Off

Relay1 Setpnt:

-500 mV

Relay1 Hys:

10 mV

Relay1 Range: mV

-500

→

+500

Relay1 PlsRate:

120 pulses/min

Last Cal:

06-30-01

page 9 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

Contrast:

Averaging:

Off

Loop Adjust:

4.00 mA

Loop Adjust:

20.00 mA

Test Loop:

Test Relay 1:

Test Relay 2:

Adjust the LCD contrast for best viewing. A setting of 1 is lower contrast, 5 is higher.
Select lower contrast if the display is in warmer ambient surroundings.

OFF provides the most instantaneous output response to changes in input value.
LOW averaging = 4 seconds, HIGH averaging produces more stable display and
output response.

Press UP or DOWN keys to manually order any output current value from 3.6 mA to
21.00 mA to test current loop output.

Press UP or DOWN keys to manually toggle the state of the relay.

Options Menu for ORP

Display

(Factory settings shown)

Description

EASY CAL Procedure - ORP

•

This procedure simplifies system calibration using standard 4.0 pH and 7.0 pH buffers

saturated with Quinhydrone

. To calibrate

using any other ORP buffer solutions, use the Standard and Slope functions in the CALIBRATE menu.

•

Access EASY CAL menu from the view menu.

* For best results, gently stir the

submerged electrode for approximately 5
seconds during the stabilization period.
Large temperature differences from
process fluids to buffers may require
longer stabilization time.

Technical notes:

The difference between the actual mV and
value shown is a good indication of the
condition of the electrode.
Differences in excess of 50 mV may
indicate a need to service the electrode.

To Calibrate:

Response:

To Accept:

Place electrode tip

in first pH buffer;

pH 7.0

≈

87 mV

pH 4.0

≈

264 mV

Allow for stabilization

to accept

Place electrode tip
in second (different)
pH buffer.

pH 4.0

≈

264 mV

pH 7.0

≈

87 mV

Allow for stabilization

Press to accept
second buffer calibration.

ENTER

* ORP: + 84 mV
Input: + 82 mV

30 seconds*

Press UP, UP, UP, DOWN buttons in sequence to enter menu,

will appear during code entry.

EASY CAL: ----
Enter Key Code

Place Sensor in

ORP Buffer #1

Place Sensor in

ORP Buffer #2

* ORP: + 84 mV
Input: + 82 mV

* ORP: + 87 mV
Input: + 82 mV

* ORP: +262 mV
Input: +260 mV

* ORP: +264 mV
Input: +260 mV

To exit menus and return to

VIEW press UP and DOWN

button at the same time

Display returns to VIEW

Menu in 10 minutes or

when ENTER is pressed

Good Easy Cal
Press <ENTER>

page 10 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

The mV value from the sensor when placed in a 7 pH buffer represents the sensor offset. Signet recommends servicing/replacing the

sensor when the offset exceeds 50 mV.

The 3-2759 pH/ORP system tester allows simple system troubleshooting.

Use pH 4, 7, 10 buffers.

Clean probe and retry EASY CAL.

Use Manual calibration for Standard and
Slope if mV offset exceeds 50 mV.

Place sensor in correct buffer solution.

Use fresh buffer.

Use pH values at least 2 pH units apart.

Clean pH sensor; replace if necessary.

Use fresh buffer.

Use pH values at least 2 pH units apart.

Clean pH sensor; replace if necessary

Use fresh buffer.

Check all wiring, contacts in preamplifier.

Verify sensor is securely installed.

Replace electrode pH sensor.

Recalibrate system.

Replace pH sensor.

Replace preamplifier.

Check all wiring, contacts in preamplifier.

Verify sensor is securely installed.

Replace pH sensor.

Required 4, 7 or 10 buffers not being
used.

Sensor is depleted too severely to use
EasyCal.

Sensor was not moved from buffer #1 to
buffer #2.

pH Standard value within 2 pH units of
Slope value.

pH Sensor efficiency is inadequate.

pH Slope value within 2 pH units of
Standard value.

pH Sensor efficiency is inadequate.

No temperature or mV signal from
sensor detected.

No connection between pH sensor and
preamplifier.

mV input is less than 0 pH or greater than
15 pH.

No temperature or mV signal from
sensor detected.

No connection between pH sensor
and preamplifier.

During EasyCal:

"Out of Range
Use Manual CAL"

During EasyCal:

"Same Buffer"

During CALIBRATE Std:
"Standard too close to Slope!"

During CALIBRATE Slope:
"Slope too close to Standard!"

During CALIBRATE:

"Out of Range
Check Sensor"

During normal operation:

Constant "15.00 pH"

constant "0.00 pH"

with good temp value

During normal operation:

"Check Sensor?"

Suggested Solutions

Troubleshooting - pH

Display Condition

Possible causes

page 11 of 12

8750-2 pH/ORP Transmitter

‡ SIGNET

Use pH 4, 7 buffers saturated with
quinhydrone.

Clean probe and retry EASY CAL.

Use Manual calibration for Standard and
Slope if mV offset exceeds 50 mV.

Place sensor in correct buffer solution.

Use fresh buffer.

Use ORP values at least 120 mV apart.

Clean ORP sensor; replace if necessary.

Use fresh buffer.

Use ORP values at least 120 mV apart.

Clean ORP sensor; replace if necessary

Use fresh buffer.

Check all wiring, contacts in preamplifier.

Verify sensor is securely installed.

Replace ORP sensor.

Recalibrate system.

Replace pH sensor.

Replace preamplifier.

Check all wiring, contacts in preamplifier.

Verify sensor is securely installed.

Replace ORP sensor.

Required 4, 7 buffers with
quinhydrone not being used.

Sensor is depleted too severely to
use EasyCal.

Sensor was not moved from buffer #1 to
buffer #2.

ORP Standard value within 120 mV
of Slope value.

ORP Sensor efficiency is inadequate.

ORP Slope value within 120 mV of
Standard value.

ORP Sensor efficiency is inadequate.

No mV signal or sensor id from
sensor detected.

No connection between ORP sensor
and preamplifier.

mV input is less than -999 or greater
than +1999.

No temperature or mV signal from
sensor detected.

No connection between ORP sensor
and preamplifier.

During EasyCal:

"Out of Range
Use Manual CAL"

During EasyCal:

"Same Buffer"

During CALIBRATE Std:
"Standard too close to Slope!"

During CALIBRATE Slope:
"Slope too close to Standard!"

During CALIBRATE:

"Out of Range
Check Sensor"

During normal operation:

Constant "-1000"

constant ""+2000"

During normal operation:

"Check Sensor?"

Troubleshooting - ORP

Display Condition

Possible causes

Suggested Solutions

‡ SIGNET

Signet Scientific Company, 3401 Aerojet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. (626) 571-2770 • Fax (626) 573-2057
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): (800) 854-4090

GEORGE FISCHER ‡ Piping Systems

3-8750.090-2/(D-4/03) English

Printed in U.S.A. on recycled paper

Ordering Information

Mfr. Part No.

Code

Description

3-8750-1

159 000 053

pH/ORP transmitter Field mount

3-8750-1P

159 000 054

pH/ORP transmitter Panel mount

3-8750-2

159 000 055

pH/ORP transmitter Field mount with relays

3-8750-2P

159 000 056

pH/ORP transmitter Panel mount with relays

3-8750-3

159 000 057

pH/ORP transmitter Field mount with single input/dual output

3-8750-3P

159 000 058

pH/ORP transmitter Panel mount with single input/dual output

Accessories

Mfr. Part No.

Code

Description

3-2714

198 844 300

Twist-Lock Flat pH electrode

3-2714-HF

198 844 305

Twist-Lock Flat pH hydrofluoric acid resistant electrode (<2%)

3-2716

198 844 302

Twist-Lock Bulb pH electrode

3-2716-DI

198 844 306

Twist-Lock Bulb pH electrode for process liquids (< I00

3-2715

198 844 301

Twist-Lock Flat ORP Electrode

3-2717

198 844 303

Twist-Lock Bulb ORP Electrode

3-2720

198 864 602

Twist-Lock Preamplifier,

in. NPT

3-2720-2

198 864 603

Twist-Lock Preamplifier, ISO 7/1-R 3/4

P31542

198 801 630

Red sensor cap for in-line installations

P31542-3

159 000 464

Blue sensor cap for in-line installations

3-2759

159 000 762

pH/ORP system tested (includes bypass adapter)

3-2759.393

159 000 765

2720 Adapter Cable

P31515-0P200

159 000 630

PVC Pipe Adapter

P31515-0C200

159 000 631

CPVC Pipe Adapter

P31515-0V200

159 000 459

PVDF Pipe Adapter

1220-0021

198 801 186

O-ring, FPM (standard)

1224-0021

198 820 006

O-ring, EPR

1228-0021

198 820 007

O-ring, Kalrez

3-8050

159 000 184

Universal mounting kit

3-8050.395

159 000 186

Splashproof rear cover

3-8050.396

159 000 617

RC Filter kit (for relay use)

3-8052

159 000 188

3/4” Integral mounting kit

3-8052-1

159 000 755

3/4" NPT mount junction box

3-0000.596

159 000 641

Heavy duty wall mount bracket

3-0700.390

198 864 403

pH buffer kit

3-8050.392

159 000 640

Model 200 retrofit adapter

3-5000.598

198 840 225

Surface mount bracket

3-5000.399

198 840 224

5 x 5 inch adapter plate for +GF+ Signet retrofit

3-9000.392

159 000 368

Liquid-tight connector kit, 3 sets, 1/2 in. NPT

3-9000.392-1

159 000 839

Liquid-tight connector kit, 1 set, 1/2 in. NPT

3-9000.392-2

159 000 841

Liquid-tight connector kit, 1 set, PG 13.5

7300-7524

159 000 687

24 VDC Power Supply 7.5 W, 300mA

7300-1524

159 000 688

24 VDC Power Supply 15 W, 600mA

7300-3024

159 000 689

24 VDC Power Supply 30 W, 1.3 A

7300-5024

159 000 690

24 VDC Power Supply 50 W, 2.1 A

7300-1024

159 000 691

24 VDC Power Supply 100 W, 4.2 A

3-3719-11

159 000 804

pH/ORP Wet-Tap, 1

in. NPT

3-3719-21

159 000 805

pH/ORP Wet-Tap, 2 in. NPT

3-3719-12

159 000 806

pH/ORP Wet-Tap, ISO 7/1-R 1.5

3-3719-22

159 000 807

Wet-Tap Assembly, ISO 7/1-R 2

3-2716-WT

159 000 809

Twist-Lock pH Electrode (use with 3719 Wet-Tap)

3-2717-WT

159 000 811

Twist-Lock ORP Electrode (use with 3719 Wet-Tap)

2007-0225

159 000 812

PP Clamp-on Saddle, 2.5 in. x 1

in. (ASTM, NPT)

2007-0230

159 000 813

PP Clamp-on Saddle, 3 in. x 1

in. (ASTM, NPT

2007-0240

159 000 814

PP Clamp-on Saddle, 4 in. x 1

in. (ASTM, NPT)

2007-0260

159 000 815

PP Clamp-on Saddle, 6 in. x 2 in. (ASTM, NPT)

2007-0280

159 000 816

PP Clamp-on Saddle, 8 in. x 2 in. (ASTM, NPT)

2007-0210

159 000 817

PP Clamp-on Saddle, 10 in. x 2 in. (ASTM, NPT)

2007-0212

159 000 818

PP Clamp-on Saddle, 12 in. x 2 in. (ASTM, NPT)

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