Omega PHTX-271 User guide

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Page 1

pH/ORP

User’s Guide

10.20 pH

25.0C

ENTER

Shop online at

omega.com

e-mail: [email protected]

For latest product manuals:

www.omegamanual.info

PHTX-127 SERIES

pH/ORP Transmitter

Page 2

omega.com [email protected]

Servicing North America:

U.S.A. Omega Engineering, Inc. Headquarters: Toll-Free: 1-800-826-6342 (USA & Canada only)

Customer Service: 1-800-622-2378 (USA & Canada only) Engineering Service: 1-800-872-9436 (USA & Canada only) Tel: (203) 359-1660 Fax: (203) 359-7700 e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves

the right to alter specifications without notice.

Page 3

Omega PHTX-271 Series pH/ORP Transmitter

pH/ORP

10.20 pH

25.0C

ENTER

CAUTION!

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

• Follow instructions carefully to avoid personal injury.

Contents

1. Installation

2. Speciﬁ cations

3. Electrical Connections

4. Menu Functions

Installation

PHTX-271 series transmitters are available in two styles: panel mount and ﬁ eld 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 FP90-UM Universal kit enables the transmitter to be installed virtually anywhere. Detailed instructions for ﬁ eld installation options are included with the FP90-UM Universal kit.

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.)

82 mm (3.23 in.)

Optional Rear Cover

92 mm (3.6 in.)

gasket

mounting

bracket

96 mm

(3.8 in.)

FRONT VIEW

Field &

Panel Mount

106 mm

(4.18 in.)

SIDE VIEW

Field Mount with

Universal Kit

Speciﬁ cations

General

Compatible electrodes: PH-2720-PA Preampliﬁ er and

Accuracy: ± 0.03 pH, ± 2 mV 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 ±5%, regulated, 21 mA

Sensor input range:

• pH: 0.00 to 14.00 pH

• Temp. 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

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

PHE/ORE series electrodes

max.

and reversible

56 mm

)

97 mm

(3.8 in.)

(2.2 in.)

Panel Mount Installation Detail

quick-clips

41 mm (1.6 in.

Panel Mount with

NEMA-4X rear cover

Open-collector output: Isolated, 50 mA sink or source, 30

VDC max. pull-up voltage

• Programmable for:

• High or Low with adjustable hysteresis

• Proportional pulse (400 pulses per minute maximum)

Relay outputs (2 sets mechanical SPDT contacts):

• High or Low programmable with adjustable hysteresis

• Pulse programmable (maximum 400 pulses/minute)

• Max. voltage rating: 5 A @ 30 VDC, or 5 A @ 250 VAC, resistive load

Environmental

• Operating temp.: -10 to 70 °C (14 to 158 °F)

• Storage temp.: -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

• Safety: EN61010

• Manufactured under ISO 9001 and ISO 14001

1Omega PHTX-271 Series pH/ORP Transmitter

Page 4

Electrical Connections

Preamplifier PH-2720-PA

pH Electrodes PHE series

ORP Electrodes ORE series

  

    

White (Temp) Green (Temp) lue (ISO GD) rown (m input)

Silver (Shield) lac (-) Red ()



      



PHTX-271-1

Terminals

PHTX-271-2

Terminals

Connecting this terminal to Earth GD may reduce electrical interference

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.

Sensor Input Connections

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.

• The maximum cable length from sensor to the pH transmitter

is 400 ft. (122 m).

pH/ORP

10.20 pH

25.0C

ENTER

≤ 400 ft. (122 m)



2 Omega PHTX-271 Series pH/ORP Transmitter

Page 5

PHTX-271-1 System Power/Loop Connections

Stan-ane appiatin n rrent p se

Trnsmitter

2 1

Ss Pr p -

Ss Pr p 

Power Sppy

C 12 - 2 

Per Spp

nnetin t a P it it-in per spp

PLC

Per Spp rn

Per Spp

p npt -2 m

nterna P

nnetin

nnetin t a P/Rerer separate spp

p npt -2 m in

C 12 - 2 

Per Spp

ampe T transmitter nnete t P/Rerer it separate per spp

Trnsmitter 2

2 1

C 12 - 2 

Per Spp

Trnsmitter 1

2 1

Trnsmitter

2 1

Ss Pr p -

Ss Pr p 

Trnsmitter

2 1

Ss Pr p -

Ss Pr p 

Ss Pr p -

Ss Pr p 

Ss Pr p -

Ss Pr p 

PLC or ecorer

anne 1 -2 m in

anne 2 -2 m in

Terminas

PLC or ecorer



Internal open-collector

output circuit

Output --

Output +

Isolation

15Ω

PHTX-271-1 Rear Terminals

Terminals 1 and 2: 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

System Pwr

Loop -

System Pwr

Loop +

Terminals 3 and 4: Open-collector Output

• A transistor output, programmable in CALIBRATE menu as:

• High or Low with adjustable hysteresis

• Proportional pulse up to 400 pulses per minute

• May be disabled (Off) if not used.

Output -

Output +

Temp -

(WHITE)

Temp +

(GREEN)

Iso. GND (BLUE)

mV Input (BROWN)

Earth

GND

Sensr Gnd

(SHIELD)

V-

(BLACK)

V+ (RED)

Terminals 9-12: Sensor connections

• 9-10 are mV (pH or ORP) input from the electrode.

• 11-12 are Temperature input from the electrode

Terminals 5-8: Preampliﬁ er power and grounds

• 5-6 are DC voltages from the transmitter to power the preampliﬁ er.

• 7-8 are ground terminals for the sensor and for earth ground.

3Omega PHTX-271 Series pH/ORP Transmitter

Page 6

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)

Stand-alone application, no current loop used

Transmitter

4 3 2 1

Sys. Pwr. Loop -

Sys. Pwr. Loop 

AX Power -

AX Power 

Power upply  12 - 24 

Power Supply

Connection to a PLC with built-in power supply

PL

Power Supply round

Power Supply

Loop Input 4-20 mA

Internal PLC Connection

Connection to a PLC/Recorder, separate supply

PL or Reorder

Loop Input 4-20 mA in

 12 - 24 

Power Supply

Example: Two transmitters connected to PLC/Recorder

with separate power supply

Transmitter 2

4 3 2 1

 12 - 24 

Power Supply

Transmitter 1

4 3 2 1

Transmitter

4 3 2 1

Sys. Pwr. Loop -

Sys. Pwr. Loop 

AX Power -

AX Power 

Transmitter

4 3 2 1

Sys. Pwr. Loop -

Sys. Pwr. Loop 

AX Power -

AX Power 

Sys. Pwr. Loop -

Sys. Pwr. Loop 

AX Power -

AX Power 

Sys. Pwr. Loop -

Sys. Pwr. Loop 

AX Power -

AX Power 

PL or Reorder

Channel 1 4-20 mA in

Channel 2 4-20 mA in

Terminals



PHTX-271-2 System Power/Loop Connections

PHTX-271-2 Rear Terminals

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.

Terminals 5-10: Relay Outputs

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

• High or Low with adjustable hysteresis

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

4 Omega PHTX-271 Series pH/ORP Transmitter

Terminals 1 and 2: AUXILIARY power

Provides power for relay operation.

• proportional pulse based on pH or ORP

• May be disabled (Off) if not used.

Terminals 11-14: Preampliﬁ er Power and Ground

• 11-12 are DC voltages from the transmitter to power the preampliﬁ er.

• 13-14 are ground terminals for the sensor and for earth ground.

Page 7

Open Collector and Relay Outputs

Open collector or Relay Output

PlsRate: 0 to 100 Pulses/min.

Endpoint

Pulse rate

0 pulses

100 pulses

Starting point

Open Collector or Relay Output

pH/ORP

10.20 pH

25.0C

ENTER

The Open Collector and relay outputs can be used as a switch that responds when the process value moves above or below a setpoint, or they can be used to generate a pulsing signal with a rate proportional to the process value.

• Low: Relay is on when process variable is less than the setpoint. The relay turns off when the process moves above the setpoint plus the hysteresis value.

• High: Relay is on when process variable is greater than the setpoint. The relay turns off when the process moves below the setpoint plus the hysteresis value.

Process

Hysteresis

Low Setpoint

Time

Relay energized

Relay de-energized

• Proportional Pulsing The output will generate a 100 mS pulse at the rate deﬁ ned 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.

Process

High Setpoint

Hysteresis

Time

VIEW Menu

• During normal operation, the transmitter displays the VIEW menu.

• When using the CALIBRATE or OPTIONS menus, the transmitter 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.

View Menu for PHTX-271 Series

Display Description

7.00 pH

12.6 °C

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

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

Input:

307 mV

Loop Output:

14.16 mA

Last CAL:

6-30-00 >

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.

Display 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).

5Omega PHTX-271 Series pH/ORP Transmitter

Page 8

Output Setpnt:

10.00 pH

Output Setpnt:

00.00 pH

ENTER

Output Setpnt:

.00 pH

Output Setpnt:

.00 pH

Output Setpnt:

Saving

Output Setpnt:

9.00 pH >

PHTX-271 Editing Procedure:

CALIBRATE: ----

Enter Key Code

CALIBRATE: *---

Enter Key Code

CALIBRATE: **--

Enter Key Code

CALIBRATE: ***-

Enter Key Code

Temperature >

Set:

10.0 pH >

Output Setpnt:

Temperature >

Set:

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 ﬁ rst 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 ﬁ rst display element will begin ﬂ ashing.

Step 5. Press UP or DOWN keys to edit the ﬂ ashing element.

• RIGHT ARROW key advances the ﬂ ashing 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.

First item in CALIBRATE menu

Step 3

Step 4

Notes on Steps 5 and 6:

• All output functions remain active during editing.

• Only the ﬂ ashing element can be edited.

• RIGHT ARROW key advances the ﬂ ashing 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.

6 Omega PHTX-271 Series pH/ORP Transmitter

Step 5: Made an Error?

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

Step 6

Step 5

Page 9

Calibrate Menu for PHTX-271-1 pH

Display

(Factory settings

shown)

Description

Set:

Temperature >

Set:

Standard

Slope

Loop Range: pH

0.00

Low

4.00 pH

0.50 pH

4.00

120 pls/min

6-30-00 >

→ 14.00 >

Output Source:

Output Mode:

Output Setpnt:

Output Hys:

Output Range: pH

Output PlsRate:

Last CAL:

Set:

→ 8.00 >

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

Applies a linear offset to the pH 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 pH 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 process.

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

Select pH or Temperature as the source for the Open Collector Output.

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

In Low or High Mode, the Open Collector output will turn on when the pH reaches this value.

In Low or High mode, the Open Collector output will turn off at Setpoint ± Hysteresis, depending on High or Low Setpoint selection. (See details on page 4.)

In Pulse mode, set the pH values for zero and for maximum pulse rate.

In Pulse mode, set the maximum pulse rate, up to 400 pulses per minute.

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

Options Menu for PHTX-271-1 pH

Display

(Factory settings

shown)

Contrast:

Off

Output Active:

Low

Temp Display:

°C

Loop Adjust:

4.00 mA Loop Adjust:

20.00 mA

Averaging:

Test Loop:

Test Output

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.

Active HIGH: This setting is used to turn a device (pump, valve) ON at the setpoint. Active LOW: This setting is used to turn a device (pump, valve) OFF at the setpoint.

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 PHTX-271 loop current 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 open collector output.

Description

7Omega PHTX-271 Series pH/ORP Transmitter

Page 10

Calibrate Menu for PHTX-271-1 ORP

Display

(Factory settings

shown)

Description

Set:

Standard

Slope

Loop Range: mV

-1000

Off

-500 mV

10 mV

-500

120 Pls/min

6-30-00 >

→ +1000 >

Output Mode:

Output Setpnt:

Output Hys:

Output Range: mV

Output PlsRate:

Last CAL:

Set:

→ +500 >

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. The ORP SLOPE is used for two-point calibration along with the ORP STANDARD. If you applied the min value of your process to the ORP STANDARD, then apply the max value to the ORP SLOPE. Else, apply the min value to the ORP SLOPE. The slope value and the standard value must be at least 30 mV apart.

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 desired mode of operation for the Open Collector output: High, Low or proportional Pulse. The signal may also be disabled if not in use.

In Low or High Mode, the Open Collector output will be deactivated when the ORP reaches this value.

In Low or High mode, the Open Collector output will be deactivated at Setpoint ± Hysteresis, depending on High or Low Setpoint selection. (See details on page 4.)

In Pulse mode, set the ORP values for zero and for maximum pulse rate.

In Pulse mode, set the maximum pulse rate, up to 400 pulses per minute.

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

Options Menu for PHTX-271-1 ORP

Display

(Factory settings

shown)

Contrast:

3 >

Averaging:

Off

Output1 Active:

Low

Temp Display:

°C

Loop 1 Adjust:

4.00 mA

Loop 1 Adjust:

20.00 mA

Test Loop1:

Test Output1

All Loop1 and Output1 functions will repeat for Loop2 and Output2.

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.

Active HIGH: This setting is used to turn a device (pump, valve) ON at the setpoint. Active LOW: This setting is used to turn a device (pump, valve) OFF at the setpoint.

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 PHTX-271 loop current 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 open collector output.

Description

8 Omega PHTX-271 Series pH/ORP Transmitter

Page 11

Calibrate Menu for PHTX-271-2 pH

Display

(Factory settings

shown)

Description

Set:

Temperature >

Set:

Standard

Slope

Loop Range: pH

0.00

Off

4.00 pH

0.51 pH

Relay1 Range: pH

4.00

120 Pls/min

6-30-00 >

→ 14.00 >

Relay1 Source:

Relay1 Mode:

Relay1 Setpnt:

Relay1 Hys:

Relay1 PlsRate:

Last CAL:

Set:

→ 8.00 >

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

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 the relay output: High, Low or proportional Pulse. The signal may be disabled if not in use.

In Low or High Mode, the relay output will turn on when the pH reaches this value.

In Low or High mode, the relay output will turn off at Setpoint ± Hysteresis, depending on High or Low Setpoint selection. (See details on page 4.)

In Pulse mode, set the pH values for zero and for maximum pulse rate.

In Pulse mode, set the maximum pulse rate, up to 400 pulses per minute.

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

All Relay1 functions will repeat for Relay2.

Options Menu for PHTX-271-2 pH

Display

(Factory settings

shown)

Contrast:

3 >

Averaging:

Off

Temp Display:

°C

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 = 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 PHTX-271 loop current 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 open collector output.

Description

All Relay1 functions will repeat for Relay2.

9Omega PHTX-271 Series pH/ORP Transmitter

Page 12

Calibrate Menu for PHTX-271-2 ORP

Display

(Factory settings

shown)

Description

Set:

Standard >

Set:

Slope

Loop Range: mV

-1000 Relay1 Mode:

Off

Relay1 Setpnt:

-500 mV

Relay1 Hys:

10 mV

Relay1 Range: mV

-500

Relay1 PlsRate:

120 Pls/min

Last CAL:

6-30-00 >

All Relay1 functions will repeat for Relay2.

→ +1000 >

→ +500 >

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 desired mode of operation for the Open Collector output: High, Low or proportional Pulse. The signal may also be disabled if not in use.

In Low or High Mode, the Open Collector output will be deactivated when the ORP reaches this value.

In Low or High mode, the Open Collector output will be deactivated at Setpoint ± Hysteresis, depending on High or Low Setpoint selection. (See details on page 4.)

In Pulse mode, set the ORP values for zero and for maximum pulse rate.

In Pulse mode, set the maximum pulse rate, up to 400 pulses per minute.

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

Options Menu for PHTX-271-2 ORP

Display

(Factory settings

shown)

Contrast:

Off

Loop Adjust:

4.00 mA Loop Adjust:

20.00 mA

Averaging:

Test Loop:

Test Relay 1

Test Relay 2

All Relay1 functions will repeat for Relay2.

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.

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 PHTX-271 loop current 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.

Description

10 Omega PHTX-271 Series pH/ORP Transmitter

Page 13

EASY CAL Procedure - pH

• This procedure simpliﬁ es system calibration using standard 4.0, 7.0, 10.0 pH buffers. If these pH buffer values 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>

For best results, gently stir the submerged electrode for approximately 5 seconds during the stabilization period.

Large temperature differences from process ﬂ uids to buffers may require longer stabilization time.

Theoretical mV values pH @ 25°C mV 2 +296 3 +237 4 +177 5 +118 6 +59 7 +0 8 -59 9 -118 10 -177 11 -237 12 -296

EASY CAL Procedure - ORP

• This procedure simpliﬁ es system calibration. Requires a prepared quinhydrone solution: Saturate 50 mL of pH 4.0 and 7.0 buffers with 1/8 g 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

To Accept:

* ORP: + 84 mV Input: + 82 mV

ENTER

* ORP: + 87 mV Input: + 82 mV

30 seconds*

* ORP: +262 mV Input: +260 mV

Allow for stabilization

30 seconds*

* ORP: +262 mV Input: +260 mV

Press to accept second buffer calibration.

* ORP: +264 mV Input: +260 mV

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

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 ﬂ uids 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.

11Omega PHTX-271 Series pH/ORP Transmitter

Page 14

Troubleshooting - pH

Display Condition Possible Cause Suggested Solution

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?"

1. Required 4, 7 or 10 pH 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 efﬁ ciency is inadequate.

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

2. pH Sensor efﬁ ciency is inadequate.

1. No temperature or mV signal from sensor detected.

2. No connection between pH sensor and preampliﬁ er.

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 preampliﬁ er.

1. Use pH 4, 7, 10 pH 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 preampliﬁ er.

2. Verify sensor is securely installed.

3. Replace pH sensor.

1. Recalibrate system.

2. Replace pH sensor

3. Replace preampliﬁ er.

1. Check all wiring, contacts in preampliﬁ er.

2. Verify sensor is securely installed.

3. Replace pH sensor.

The mV value from the sensor when placed in a 7 pH buffer represents the sensor offset. It is recommended that the sensor be serviced or replaced when the offset exceeds 50 mV.

Troubleshooting - ORP

Display Condition Possible Cause Suggested Solution

1. Use pH 4 and 7 pH buffers properly 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 preampliﬁ er.

2. Verify sensor is securely installed.

3. Replace ORP sensor.

1. Recalibrate system.

2. Replace ORP sensor.

3. Replace preampliﬁ er.

1. Check all wiring, contacts in preampliﬁ er.

2. Verify sensor is securely installed.

3. Replace ORP sensor.

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"

with good temp value

During normal operation:

"Check Sensor?"

1. Required 4 and 7 pH 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 efﬁ ciency is inadequate.

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

2. ORP Sensor efﬁ ciency is inadequate.

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

2. No connection between ORP sensor and preampliﬁ er.

Input is beyond the measurement range of the PHTX-271: Less than

-999 mV or greater than +1999 mV.

1. No mV signal from sensor detected.

2. No connection between ORP sensor and preampliﬁ er.

12 Omega PHTX-271 Series pH/ORP Transmitter

Page 15

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS, please have the following information available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems

relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.

reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.

FOR NON-WARRANTY REPAIRS, OMEGA for current repair charges. Have the following information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems relative to the product.

consult

Page 16

Where Do I Find Everything I Need for

Process Measurement and Control?

OMEGA…Of Course!

Shop online at omega.com

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