Omega Products PHTX-271-3 Installation Manual

ISO 9002

CERTIFIED

CORPORATE QUALITY

MANCHESTER, UK

pH/ORP

10.20 pH

25.0 °C

User’s Guide

Shop online at

ENTER

www.omega.com

e-mail: [e-mail]

ISO 9001

CERTIFIED

CORPORATE QUALITY

STAMFORD, CT

PHTX-271 Series

pH/ORP Transmitter

omega.com

omega.com

TM

®

OMEGAnet® Online Service Internet e-mail

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dy 1868, 733 01 Karvin. 8

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constantly pursuing certi cation of its products to the European New Approach Directives. OMEGA will add the
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The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter speci cations without notice.
WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

Omega PHTX-271 Series pH/ORP Transmitter

pH/ORP

10.20 pH

25.0 °C

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 ¼ 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
PHE/ORE series electrodes
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 max.
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 and reversible

• Max loop impedance: 50 Ω max. @ 12 V
325 Ω max. @ 18 V
600 Ω max. @ 24 V

56 mm

41 mm

(2.2 in.)

(1.6 in.

)

97 mm
(3.8 in.)

Panel Mount with

NEMA 4X rear cover

Panel Mount
Installation Detail

quick-clips

• Update rate: 0.5 seconds

• Accuracy: ±0.03 mA @ 25°C, 24 V
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):

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

• High or Low 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

• CE

• Immunity: EN50082-2

• Emissions: EN55011

• Safety: EN61010

• Manufactured under ISO 9001 and ISO 14001

1 of 24

Electrical Connections

12
11
10

9
8
7
6
5

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

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

Preamplifier:
PH-2720-PA

pH Electrodes:
PHE series

ORP Electrodes:
ORE series

(Connecting this terminal to Earth GND

may reduce electrical interference)

18
17
16
15
14
13
12
11

16
15
14
13
12
11
10

9

***

*

PHTX-271-1

Terminals

PHTX-271-3

Terminals

PHTX-271-2

Terminals

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

25.0 °C

2

1

ENTER

≤ 400 ft. (122 m)

ENTER

2 of 24

PHTX-271-1 System Power/Loop Connections

Internal open-collector

output circuit

Output --

Output +

Isolation

15Ω

S

D

Stand-alone application, no current loop used

Transmitter

Terminals

System Pwr Loop -

System Pwr Loop +

2

4
1

3

­+

Power

Supply

12-24 VDC

Connection to a PLC/Recorder, separate supply

PLC or Recorder

System Pwr Loop -

System Pwr Loop +

Transmitter

Terminals

2

4
1

3

+

-

-

12-24 VDC

+

Loop Input

4-20 mA

Power

Supply

Connection to a PLC with built-in power supply

Transmitter

Terminals

System Pwr Loop -

System Pwr Loop +

Two transmitters connected to PLC/Recorder
with separate power supply

Transmitter 1

Ter min al s

System Pwr Loop -

System Pwr Loop +

2

4
1

3

Internal

PLC

Connection

2

4

1

3

+

-

­+

­+

+

-

+

-

Channel 1
4-20 mA in

Channel 2
4-20 mA in

Power

Supply

12-24 VDC

PLC Terminals

Loop Input

4-20 mA

Power

Supply

12-24 VDC

PLC or Recorder

Transmitter 2

Terminals

2

System Pwr Loop -

4
1

System Pwr Loop +

3

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

2

Loop -

System Pwr

1

Loop +

4

3

Output -

Output +

Temp -

12

(WHITE)

11

10

9

8

7

6

5

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.

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.

3 of 24

PHTX-271-2 System Power/Loop Connections

p

p

Stand-alone application, no current loop used

Transmitter

Terminals

System Pwr Loop -

System Pwr Loop +

AUX Power -

AUX Power +

4

4
3

3
2

2
1

1

­+

Connection to a PLC with built-in power supply

System Pwr Loop -

System Pwr Loop +

AUX Power -

AUX Power +

Transmitter

Terminals

4

4

3

3

2

2

1

1

PLC

Internal

Connection

PLC Terminals

+

-

­+

Power

Supply

12-24 VDC

Loop Input

4-20 mA

Power

Supply

12-24 VDC

Connection to a PLC/Recorder, separate supply

PLC or Recorder

Transmitter

Terminals

System Pwr Loop -

System Pwr Loop +

AUX Power -

AUX Power +

Two transmitters connected to PLC/Recorder
with separate power supply

System Pwr Loop -

System Pwr Loop +

AUX Power -

AUX Power +

4

4

3

3

2

2

1

1

Transmitter 1

Terminals

4

3

2

1

+

-

­+

-

12-24 VDC

+

+

-

­+

Channel 1
4-20 mA in

Channel 2
4-20 mA in

Power

Supply

Loop Input

4-20 mA

Power
Supply

12-24 VDC

PLC or Recorder

Transmitter 2

Terminals

4

System Pwr Loo

4

3

System Pwr Loo

3

2

AUX Power -

2

1

AUX Power +

1

PHTX-271-2 Rear Terminals

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

System Pwr

4

Loop -

System Pwr

3

Loop +

AUX

2

Power -

AUX
Power +

1

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 or10KΩ identifying resistor
from the ORP electrode.

18

17

16

Relay 2

10

9

8

7

6

5

(NO)

Relay 2
(COM)

Relay 2
(NC)

Relay 1
(NO)

Relay 1
(COM)

Relay 1
(NC)

15

14

13

12

11

Temp ­(WHITE)

Temp +
(GREEN)

Iso. GND
(BLUE)

mV Input
(BROWN)

Earth
GND

Sensr Gnd
(SHIELD)

V­(BLACK)

V+
(RED)

4 of 24

Terminals 1 and 2: AUXILIARY power

Provides power for relay operation.

Terminals 11-14: Preamplifi er power and grounds

• 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

PHTX-271-3 Rear Terminals

Terminals 1-4: 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 13-16: Sensor connections
13-14 are mV (pH or ORP) input from the electrode.

15-16 are Temperature input from the pH electrode or

10K Ω id resistor from ORP electrode

Output 2-

8

16

15

14

13

Temp ­(WHITE)

Temp +
(GREEN)

Iso. GND
(BLUE)

mV Input
(BROWN)

4

3

2

1

Internal open-collector

output circuit

15W

S

Isolation

D

PHTX-271-3 System Power/Loop Connections

Stand-alone application, no current loop used

Loop 2 -

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

Transmitter Terminals

Outputs

1

2

_

+

NC

4

NC

3

2

1

_

+

Power

Supply

12-24 VDC

Loop 2 -

Loop 2 +

System Pwr
Loop 1 -

System Pwr
Loop 1 +

7

6

5

Output 2+

Output 1-

Output 1+

Terminals 5-8: Open-collector Outputs
Two transistor outputs, 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.

Connection to a PLC with built-in power supply

Loop 2 -

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

12

11

10

9

Terminals 9-12: Preamplifi er
power and grounds

• 9-10 are DC voltages from the

8750 to power the preamplifi er.

• 11-12 are ground terminals for
the sensor and for earth ground.

Transmitter

Ter mina ls

4

3

2

1

Internal

PLC Connection

PLC Terminals

+

_

+

_

+

_

Earth
GND

Sensr Gnd
(SHIELD)

V­(BLACK)

V+
(RED)

Channel 2

4-20 mA

Channel 1

4-20 mA

Power

Supply

12-24 VDC

Connection to a PLC/Recorder separate supply

PLC or Recorder

+

Channel 2

Transmitter

Ter mina ls

Loop 2 -

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

4

3

2

1

_

+

_

_

+

4-20 mA

Channel 1

4-20 mA

Power

Supply

12-24 VDC

The current loop is a passive circuit.
12-24 VDC must be provided from an external source.

Two transmitters connected to
PLC/Recorder
with separate power supply

Transmitter 1

Ter min als

Loop 2 -

4

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

3
2

1

PLC or Recorder

+

Channel 1

_

4-20 mA

+

Channel 2

_

4-20 mA

+

Channel 3

_

4-20 mA

+

Channel 4

_

4-20 mA

Power

_

Supply

+

12-24 VDC

Transmitter 2

Ter min als

4

3

2

1

Loop 2 -

Loop 2 +

System Power Loop 1 -

System Power Loop 1 +

5 of 24

Open Collector and Relay Outputs

Hysteresis

Time

Low Setpoint

Process

Hysteresis

Output active

Output inactive

High Setpoint

Process

10

5

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

25.0 °C

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:

Output triggers when process variable is less than the setpoint.
The output will relax when the process moves above the setpoint
plus the hysteresis value.

• High:

Output triggers when process variable is greater than the
setpoint. The output will relax when the process moves below the
setpoint plus the hysteresis value.

• 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.

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

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)

6 of 24

7.00 pH

12.6 °C

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:
6-30-00 >

EASY
CAL: >

PHTX-271 Editing Procedure:

OPTIONS

CALIBRATE

VIEW

2s 5s

Press &
hold for
access:

ENTER

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.

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.

CALIBRATE: ----

Enter Key Code

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.

CALIBRATE: *---

Enter Key Code

CALIBRATE: **--

Enter Key Code

CALIBRATE: ***-

Enter Key Code

Set:

Temperature >

Temperature >

First item in
CALIBRATE menu

Set:

Step 3

Step 3: Finished Editing?

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

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.

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.

Output Setpnt:

10.0 pH >

Output Setpnt:

10.00 pH

Output Setpnt:

00.00 pH

Output Setpnt:

0.00 pH

0

Step 6

Output Setpnt:

9.00 pH >

Step 5

Output Setpnt:

9

.00 pH

0

Output Setpnt:

Saving

Step 4

ENTER

7 of 24