EC Analog Controller with Direct Input from Potentiometric Probe - HI943500

In stock
HI943500 are panel-mounted conductivity controllers designed for simplicity of use in a wide range of industrial process applications. Four different models are available with different measurement ranges, to satisfy any application requirements.
  • Automatic temperature compensation ensures fast, accurately compensated readings even during sudden temperature fluctuations.
  • Four different models are available with different measurement ranges.
  • Displays values on the easy to read LCD with backlighting.

No Need for a Transmitter

These controllers allow the direct connection of a potentiometric conductivity probe (HI 7638) with a cable up to 20 meters long, without using any transmitter.

Self-testing Diagnostics

Designed with built-in diagnostic functions to enable the user to check and troubleshoot the instrument. The checks performed are through the front panel keys and can be used to isolate the cause of malfunction.

Visual Indicator

The LED on the front panel indicates the operating status of the controller.

Automatic Temperature Compensation

The automatic temperature compensation (ATC) is performed directly by the HI 7638 probe with built-in temperature sensor.

Friendly Interface

The instruments are designed with a standard DIN panel mount with membrane keypads on the front, a large LCD and with auto-diagnostic functions

Robust Design

A removable, transparent splash-proof cover protects the front panel




EC Range 

HI943500A: 0.0 to 199.9 mS/cm 
HI943500B: 0.00 to 19.99 mS/cm 
HI943500C: 0 to 1999 µS/cm 
HI943500D: 0.0 to 199.9 µS/cm 

EC Resolution 

HI943500A: 0.1 mS/cm 
HI943500B: 0.01 mS/cm 
HI943500C: 1 µS/cm 
HI943500D: 0.1 µS/cm 

EC Accuracy (@20°C/68°F) 

±2% F.S 

Temperature Compensation 

automatic, 0 to 60°C (32 to 140°F), with β=2%/°C 


manual, two point, through offset and slope trimmers 

Recorder Output 

4 to 20 mA (isolated) 

Setpoint Relay 

Isolated, 2A, Max. 240V, resistive 


HI7635 for in-line applications or HI7638 for tank (not included) 

Power Supply 

115 or 230 Vac ±10% (user selectable); 50/60 Hz 

Alarm Relay 

load, 1,000,000 strokes 


-10 to 50°C (14 to 122°F); RH 95% 

Enclosure/ Case Material 

DIN 43 700, 144x72 mm (5.7x2.8"), black anodized aluminum; front and back with shockproof ABS plastic, and transparent cover 


141 x 69 mm (5.6 x 2.7") 


1 kg (2.2 lb.)