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Loop Powered Indicating pH/ORP Meter & Transmitter

pH/ORP Meter & Transmitter
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Item# PHTX-100

In stock

Lead Time (If not in stock): 14 weeks
pH/ORP Meter & Transmitter PHTX-100 PHTX-100
  • Loop Powered 4 to 20 mA
  • Non-Volatile Memory for Configurations and Calibration Data
  • Output Current Indicator for Out-of-Range and Hold Conditions
  • Large Segmented Display Indicates ph or mV and Temperature

PHTX-100 Model Options

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Measurement Type
Supply Power
Output Type

The PHTX-100 pH/mV transmitter is a loop-powered 4 to 20 mA transmitter with a wide range of useful features and programmable options. Five buffer choices are available in two-point calibration mode. The 4 to 20 mA output is saleable in pH or mV units and has 500V input to output isolation. Temperature is always displayed and is selectable in ºC or ºF. All stored parameters and calibration data are retained in the non-volatile memory during transmitter power down or power loss. A useful probe clean reminder icon flashes when it is time to clean the probe. Probe cleaning interval is user programmable from 1 to 250 days.

The PHTX-100 can be used for wall mounting, panel mounting, pipe mounting and DIN-rail mounting. Cable grips for inlet/outlet to box are included as well as all mounting hardware. The case meets NEMA 4X (IP65) ratings for water resistance.

Measuring Range (pH): 0.00 to 14.00 pH, 0.01 pH resolution, ±0.01 accuracy
Measuring Range: (ORP/mV) -1999 to 1999 mV, 1 mV resolution, ±2 mV accuracy
Temperature Range: -20 to 110°C (-4 to 230°F) 0.1°C/°F resolution
Current Output Range: 2.00 to 24 mA, 0.01 mA resolution, ±0.005 mA accuracy, 500V input/output isolation
Enclosure: NEMA 4X (IP65), ABS case with pushbutton control pad
Dimensions: 99.1 H x 99.1 W x 74.7 mm D (3.9 x 3.9 x 2.9")
Weight: 0.45 kg (1 lb) approx.
Mounting Options: Wall, panel, DIN rail and pipe
Conduit Openings: 2 each 3/8 NPT openings (cord grips included)
Ambient Temperature: Transmitter service, 0 to 60°C (32 to 140°F)
Ambient Humidity: 0 to 95%, non-condensing
Location: Designed for non-hazardous areas
Temperature Input: 2-wire Pt1000 RTD with automatic compensation
Maximum Sensor-to-Transmitter: 9.1 m (30') distance
Power Requirement: 12 to 24 Vdc, maximum 600Ω load
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Rated 1 out of 5 by from The Ph Meter is not working It is not working, we are not getting accurate measures of the pH system so we are currently pH measuring with another system.
Date published: 2021-05-04
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1) Does this come with a probe or is it just the meter? 2) What probes wiring does it connect to ( BNC connection)? 3) Can we recalibrate through the display or do we have to open the box to manually recalibrate?

Asked by: Tessa
1) pH probes are sold separately. 2) ADAPTOR-BNCF-SL and PHE-7351-15. 3) You have to open the back of the transmitter to connect the pH probe. You calibrate the system through the display interface.
Answered by: ASE HPO
Date published: 2020-02-13

What is the current draw of PHTX-100 (i.e. for circuit breaker sizing)?

Asked by: altabie
Thank you for your inqury about the pH transmitter. Using Ohm's Law to calucate the current draw an email had been sent since it contains a chart with different loads and voltages.
Answered by: Application Engineer JC
Date published: 2023-06-02

How do I get NIST traceable calibration record with this purchase?

Asked by: Hailey
Thanks for connecting with Omega. The PHTX-100 does not have the option for a NIST traceable certificate. We do not have any pH transmitters with this option. We have calibration solutions that are NIST traceable though. Please contact our Tech Support or email for further assistance. Thanks!
Answered by: Jane
Date published: 2019-05-28

Is the temp probe contained in the Ph probe ? Is there a 4/20mA output for the Ph AND the temperature ?

Asked by: dbean
Thank you for your inquiry on the PHTX-100 pH transmitter. There is no temperature probe sold separately, it is from the pH probe when purchase that will need a 2-wire Pt100 RTD for Automatic Temperature Compensation.
Answered by: JC ENGR
Date published: 2020-10-02
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