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HACH COMPANY was established in 1947, in Ames, Iowa, USA. For more than 60 years, Hach has been the world market leader for Analytical Instrumentation for Complete Water Analysis, providing solutions for lab, process and field.

In 2002, GLI, a leading US manufacturer of process electro-chemistry analytical instruments, became part of the Hach Company family.

Water analysis has to be right. Our customers deserve complete, reliable solutions that they can be fully  confident in. Hach is your answer. We make water analysis simpler

2-Wire Analogue Transmitter


2-Wire Analogue Transmitter


The Hach si792P pH/ORP 2-wire Transmitter is full-featured and intuitive to operate. Combined with Hach world-class differential pH/ORP technology, the system provides the most accurate and reliable data available for monitoring pH/ORP. Rugged construction is designed for Class I, Division 2 (C I, D 2) or Class I, Division 1 (C I, D 1) applications. Digital communication capabilities are available.

  • The Right Sensors
  • Multiple Communication Protocols
  • Area Rate to Suit Your Needs
  • Easy-to-use Intuitive Interface
  • Sensor Diagnostics


Accuracy:< 0.02 pH units plus sensor error; TC: 0.002 pH/K
Accuracy: Current Output:< 0.3 % of current value + 0.05 mA
Accuracy 2:< 1 mV plus sensor error; TC: 0.1 mV/K
Communication:HART: digital communication by FSK modulation of loop current, reading of device identification, measured values, status and messages, reading and writing of parameters,
Communication 2:start of product calibration, signaling of configuration changes according to FDA 21 CFR Part 11
Communication Capabilities:HART
Current Input:Glass Electrode: < glass electrode
Current Input 2:reference electrode
Current Output:4 to 20 mA floating (3.80–22.00 mA specifiable)
Dimensions Metric (H x W X D):144 mm x 144 mm x 105 mm
Display Range:-2 to 16 pH
Display Range 2:-1999 to 1999 mV
Enclosure Rating:IP65
Input Resistance:Glass Electrode: > 0.5 x1012 
Input Resistance 2:Reference Electrode: > 1 x 1010 
Material:PBT (polybutylene terephthalate)
Measuring Principle:Two wire transmitter
Memory Backup:> 10 years Parameters and calibration data (EEPROM)
Operating Temperature Range:-20 to 55 °C NTC 300 Ω
Output span ORP:200 to 3000 mV
Output span pH:2 to 18 pH
pH/ORP input:For combination or differential pH/ORP sensors (glass/reference electrode input according to IEC 746 part 1, at nominal operating conditions)
Power Requirements (Voltage):14 - 30 V DC
Protection Class:C1D1, Atex
Resolution temperature:0.1
Sensocheck:Sensocheck automatic monitoring of
glass and reference electrode (can be
disabled). delay: 30 seconds
Sensor monitor:Direct display of measured values from
sensor for validation (electrode
Storage Conditions:-20 to 70 °C (-4 to 158 °F)
Strain Reliefs:2 knockouts for ½ inch NPT or rigid metallic conduit, 3 knockouts for M20 x 1.5
Temperature Compensation:Linear –19.99 to 19.99%/K
(25 °C reference temperature)
Temperature Input:Pt100/Pt1000/NTC 300 Ω (selectable), 2-wire connection
Weight:2.2 lbs. (1 kg)


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