GF Signet 8750-2, 8750-3 User Manual

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Page 1

‡ SIGNET

8750-2 pH/ORP Transmitter

ENGLISH

3-8750.090-2

CAUTION!

• Remove power to unit before wiring input and output connections.

• Follow instructions carefully to avoid personal injury.

D-4/03 English

Contents

1. Installation

2. Specifications

3. Electrical Connections

Relay 1

4. Menu Functions

1. 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

1. 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.

2. Place gasket on instrument, and install in panel.

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

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

96 mm

(3.8 in.)

FRONT VIEW

Field Mount &

Panel Mount

96 mm (3.8 in.)

42 mm (1.7 in.)

8050

64 mm (2.5 in.)

106 mm (4.2 in.)

SIDE VIEW

Field Mount

82 mm (3.23 in.)

41 mm

)

(1.6 in.

SIDE VIEW

Panel Mount

Optional Rear Cover

56 mm (2.2 in.)

97 mm

(3.8 in.)

92 mm (3.6 in.)

gasket

latch

Panel Mount Installation Detail

panel

terminals

m e t

s y

o o L

m e t

s y S

o o L

s n e

)

A L

B (

t u p

t u

d n

G r s

)

L E I

H S (

I r s

n e

) D

E R (

u p

quick-clips

pH/ORP

10.20 pH

25.0°C

mounting

bracket

Relay 2

ENTER

2. 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°F)

• ORP: -1000 to +2000 mV, isolated

(10KΩ I.D. resistance T+, T-) Current output:

•4 to 20 mA, isolated, fully adjustable and reversible

• Max loop impedance: 50 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°F)

• Storage temperature: -15 to 80°C (5 to 176°F)

• Relative humidity: 0 to 95%, non-condensing

• Maximum altitude: 2000 m (6562 ft)

• Insulation category: II

• Pollution degree: 2

Standards and Approvals

• CSA, CE, UL listed

• Immunity: EN50082-2

• Emissions: EN55011 Class B

• Manufactured under ISO 9001 and ISO 14001

Page 2

3. Electrical Connections

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

Wiring Procedure

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

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

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

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

Wiring Removal Procedure

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

2. 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 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 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 10KΩ identifying resistor from the ORP electrode.

2 1

Terminals 3 and 4: Loop Power

12-24 VDC ±10% system power

and current loop output.

Max. loop impedance:

50 Ω max. @ 12 V 325 Ω max. @ 18 V 600 Ω max. @ 24 V

Terminals 1 and 2: AUXILIARY power

Provides power for relay operation.

System Pwr Loop -

System Pwr Loop +

AUX Power -

AUX Power +

Temp -

(WHITE)

Temp +

(GREEN)

Iso. GND (BLUE)

Relay 2

(NO)

Relay 2

(COM)

Relay 2

(NC)

Relay 1

(NO)

Relay 1

(COM)

Relay 1

(NC)

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

mV Input (BROWN)

Earth GND

Sensr Gnd (SHIELD)

V(BLACK)

V+ (RED)

page 2 of 12

8750-2 pH/ORP Transmitter‡ SIGNET

Page 3

3.1 Sensor Input Connections

Terminals

* (connection of terminal 14 to Earth GND

White (Temp)

Green (Temp)

Blue (ISO GND)

Brown (mV input)

15 14

Silver (Shield)

Black (V-)

Red (V+)

may reduce electrical interference)

3.2 System Power/Loop Connections

Stand-alone application, no current loop used

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

Preamp:

+GF+ SIGNET 2720

pH Electrodes

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

ORP Electrodes:

+GF+ SIGNET 2715 +GF+ SIGNET 2717



Transmitter

Terminals

4 3

3 2

2 1

– +

Transmitter

pH/ORP

≤ 400 ft. (122 m)

Power

Supply

12–24 VDC

Connection to a PLC/Recorder, separate supply

PLC or Recorder

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

Transmitter

Terminals

4 3

3 2

2 1

Loop Input

–

– +

12–24 VDC

4-20 mA

Power

Supply

Connection to a PLC with built-in power supply

Transmitter

Terminals

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

AUX power required for all 8850 systems

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

PLC or Recorder

Channel 1 4-20 mA in

–

– +

Channel 2 4-20 mA in

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

Transmitter 1

Terminals

4 3 2 1

4 3

3 2

2 1

Transmitter 2

Terminals

Internal

Connection

PLC

System Pwr Loop –

System Pwr Loop +

AUX Power –

AUX Power +

PLC Terminals

Loop Input

4-20 mA

– –

Power

Supply

12–24 VDC

– +

12–24 VDC

Power

Supply

page 3 of 128750-2 pH/ORP Transmitter ‡ SIGNET

Page 4

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 is 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.

Process

• 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.

100 pulses

Hysteresis

Low Setpoint

Relay Output Rate:

0 to 100 Pulses/min.

0 pulses

Relay energized

Time

Starting point

Relay relaxed

Process

High Setpoint

Hysteresis

Time

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.

Pulse rate

endpoint

Relay 1

pH/ORP

10.20 pH

25.0°C

Relay 2

ENTER

View Menu for pH

Display Description

7.00 pH

12.6ºC

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: >

page 4 of 12

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

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)

8750-2 pH/ORP Transmitter‡ SIGNET

Page 5

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.

Notes on Step 1:

• The View Menu is normally displayed.

• The CALIBRATE and OPTIONS menus require a KEY CODE.

Press & hold for access:

VIEW

ENTER

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.

2s 5s

CALIBRATE

OPTIONS

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.

Step 3: Finished Editing?

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

CALIBRATE: ----

Enter Key Code

CALIBRATE: *---

Enter Key Code

CALIBRATE: **--

Enter Key Code

CALIBRATE: ***-

Enter Key Code

Temperature >

Relay1 Setpnt:

10.0 pH >

Set:

Step 3

First item in CALIBRATE menu

Step 4

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.

Step 5: Made an Error?

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.

Relay1 Setpnt:

0.00 pH

Relay1 Setpnt:

0.00 pH

Relay1 Setpnt:

.00 pH

Step 6

Relay1 Setpnt:

9.00 pH >

Step 5

Relay1 Setpnt:

.00 pH

Relay1 Setpnt:

Saving

page 5 of 128750-2 pH/ORP Transmitter ‡ SIGNET

ENTER

Page 6

Calibrate Menu for pH

Display

(Factory settings shown)

Set:

Temperature >

Description

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

Set:

Standard >

Set:

Slope >

Loop Range: pH

→→

0.00

→ 14.00 >

→→

Relay1 Source:

pH >

Relay1 Mode:

Off >

Relay1 Setpnt:

4.00 pH >

Relay1 Hys:

0.51 pH >

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.)

Relay1 Range:

4.00

→→

→ 8.00 >

→→

Relay1 PlsRate:

120 Pulses/min >

Last CAL:

06-30-01 >

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.

page 6 of 12

8750-2 pH/ORP Transmitter‡ SIGNET

Page 7

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.

EASY CAL: ---Enter Key Code

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

_ _ _ _

XXXX will appear during code entry.

To Calibrate:

Place Sensor in

pH Buffer #1

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

Place Sensor in

pH Buffer #2

Place electrode tip in second pH buffer.

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

Response:

* 6.90 pH

-005 mV

Allow for stabilization

30 seconds*

* 3.93 pH

+179 mV

Allow for stabilization

30 seconds*

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

To Accept:

* 6.90 pH

-005 mV

ENTER

to accept

* 7.00 pH

-005 mV

* 3.93 pH

+179 mV

ENTER

Press to accept second buffer calibration.

* 4.00 pH

+179 mV

Good Easy Cal Press <ENTER>

Theoretical mV values pH @ 25°CmV

2 +296 3 +237 4 +177 5 +118 6 +59 7+0 8 -59

9 -118 10 -177 11 -237 12 -296

Options Menu for pH

Display

(Factory settings shown)

Contrast:

Averaging:

Off >

Temp Display:

Loop Adjust:

4.00 mA

Loop Adjust:

20.00 mA >

Test Loop:

Description

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.

Test Relay 1:

Test Relay 2:

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

page 7 of 128750-2 pH/ORP Transmitter ‡ SIGNET

Page 8

Calibrate Menu for ORP

Display

(Factory settings shown)

Set:

Standard >

Description

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.)

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 >

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"

Last Cal:

06-30-01 >

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

page 8 of 12

8750-2 pH/ORP Transmitter‡ SIGNET

Page 9

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.

EASY CAL: ---Enter Key Code

To Calibrate:

Place Sensor in

ORP Buffer #1

Place electrode tip in first pH buffer;

pH 7.0 ≈ 87 mV pH 4.0 ≈ 264 mV

Place Sensor in

ORP Buffer #2

Place electrode tip in second (different) pH buffer.

pH 4.0 ≈ 264 mV pH 7.0 ≈ 87 mV

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

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

will appear during code entry.

Response:

* ORP: + 84 mV Input: + 82 mV

Allow for stabilization to accept

30 seconds*

* ORP: +262 mV Input: +260 mV

Allow for stabilization

30 seconds*

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

* ORP: + 84 mV Input: + 82 mV

* ORP: +262 mV Input: +260 mV

Press to accept second buffer calibration.

* ORP: +264 mV Input: +260 mV

To Accept:

ENTER

* ORP: + 87 mV Input: + 82 mV

ENTER

Good Easy Cal Press <ENTER>

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.

Options Menu for ORP

Display

(Factory settings shown)

Contrast:

Averaging:

Off >

Loop Adjust:

4.00 mA >

Loop Adjust:

20.00 mA >

Test Loop:

Description

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.

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.

Test Relay 1:

Test Relay 2:

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

page 9 of 128750-2 pH/ORP Transmitter ‡ SIGNET

Page 10

Troubleshooting - pH

Display Condition Possible causes

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"

1. Required 4, 7 or 10 buffers not being used.

2. Sensor is depleted too severely to use EasyCal.

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

1. pH Standard value within 2 pH units of Slope value.

2. pH Sensor efficiency is inadequate.

1. pH Slope value within 2 pH units of Standard value.

2. pH Sensor efficiency is inadequate.

1. No temperature or mV signal from sensor detected.

2. No connection between pH sensor and preamplifier.

Suggested Solutions

1. Use pH 4, 7, 10 buffers.

2. Clean probe and retry EASY CAL.

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

1. Place sensor in correct buffer solution.

2. Use fresh buffer.

1. Use pH values at least 2 pH units apart.

2. Clean pH sensor; replace if necessary.

3. Use fresh buffer.

1. Use pH values at least 2 pH units apart.

2. Clean pH sensor; replace if necessary

3. Use fresh buffer.

1. Check all wiring, contacts in preamplifier.

2. Verify sensor is securely installed.

3. Replace electrode pH sensor.

During normal operation:

Constant "15.00 pH"

constant "0.00 pH"

with good temp value

During normal operation:

"Check Sensor?"

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.

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

1. No temperature or mV signal from sensor detected.

2. No connection between pH sensor and preamplifier.

1. Recalibrate system.

2. Replace pH sensor.

3. Replace preamplifier.

1. Check all wiring, contacts in preamplifier.

2. Verify sensor is securely installed.

3. Replace pH sensor.

page 10 of 12

8750-2 pH/ORP Transmitter‡ SIGNET

Page 11

Troubleshooting - ORP

Display Condition Possible causes Suggested Solutions

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"

1. Required 4, 7 buffers with quinhydrone not being used.

2. Sensor is depleted too severely to use EasyCal.

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

1. ORP Standard value within 120 mV of Slope value.

2. ORP Sensor efficiency is inadequate.

1. ORP Slope value within 120 mV of Standard value.

2. ORP Sensor efficiency is inadequate.

1. No mV signal or sensor id from sensor detected.

2. No connection between ORP sensor and preamplifier.

1. Use pH 4, 7 buffers saturated with quinhydrone.

2. Clean probe and retry EASY CAL.

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

1. Place sensor in correct buffer solution.

2. Use fresh buffer.

1. Use ORP values at least 120 mV apart.

2. Clean ORP sensor; replace if necessary.

3. Use fresh buffer.

1. Use ORP values at least 120 mV apart.

2. Clean ORP sensor; replace if necessary

3. Use fresh buffer.

1. Check all wiring, contacts in preamplifier.

2. Verify sensor is securely installed.

3. Replace ORP sensor.

During normal operation:

Constant "-1000"

constant ""+2000"

During normal operation:

"Check Sensor?"

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

1. No temperature or mV signal from sensor detected.

2. No connection between ORP sensor and preamplifier.

1. Recalibrate system.

2. Replace pH sensor.

3. Replace preamplifier.

1. Check all wiring, contacts in preamplifier.

2. Verify sensor is securely installed.

3. Replace ORP sensor.

page 11 of 128750-2 pH/ORP Transmitter ‡ SIGNET

Page 12

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 µs) 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, 1/4 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, 11/2 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 11/2 in. (ASTM, NPT) 2007-0230 159 000 813 PP Clamp-on Saddle, 3 in. x 11/2 in. (ASTM, NPT 2007-0240 159 000 814 PP Clamp-on Saddle, 4 in. x 11/2 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)

‡ 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