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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

GLI 2-Wire Transmitter


GLI 2-Wire Transmitter


The economical PRO-P3 Transmitter is easy to use with its menu-guided user interface. The NEMA 4X enclosure can be panel, wall, pipe, or integral sensor mounted. The interface is identical to GLI's 33-series analyzers. Versatile 2, 3, or 4-wire hookup capability. Isolated 4-20 mA output. The transmitter is also passcode protected.

  • Menu-guided Operation
  • Isolated 0/4 - 20 mA Analog Output
  • Multiple Language Capability
  • Passcode-protected Access
  • Versatile Hookup Capability


Accuracy:± 0.1 % of span, at 25 °C
Calibration Method:2-point Buffer (for pH only)
1-point Sample (for pH or ORP)
Communication:4-20mA Output
Communication Capabilities:4-20mA Output
Current Output:0/4 to 20 mA with 0.004 mA (12-bit) resolution (during calibration, the analog output is automatically held at the last measured value and, upon completion, returned to its active state)
Display:2-line by 16 character backlit LCD
Enclosure Rating:NEMA 4X
Load:Maximum permissible load dependent on power supply voltage, transmitter hookup arrangement, and wire resistance
Material:Enclosure: Polycarbonate
Measuring Range ORP:-2100 to 2100 mV
Measuring Range pH:Selectable Ranges:
2.0 to 14.0 pH and 2.00 to 14.00 pH
Measuring Range Temperature:-20 to 200 °C
Mounting:Panel, wall, pipe, or integral sensor mounting
Operating Temperature Range:-20 to 60 °C at 0 to 95% RH (non-condensing)
Power Requirements (Voltage):14 - 30 V DC
Relative Humidity:0 to 95 % non-condensing
Repeatability:± 0.05 % of span, at 25 °C
Response Time T90:1 to 60 s with output filter setting of zero
Special Notes:The measured pH (or ORP) and temperature can be displayed separately or together on one screen. Both analog output values are
shown together on one screen
Storage Conditions:-30 °C to 70 °C
Temperature Compensation:-10 to 110 °C automatic with selection for NTC 300 Ω, Pt1000 or Pt100 or manually fixed at a user-entered temperature; additional selectable temperature correction factors (ammonia, morpholine or user-set pH/°C linear slope)
Temperature Drift:± 0.02 % of span per °C (zero and span), at 25 °C
Weight:0.62 lbs. (0.280 kg)


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