Both electrode and transmitter compatible inputs accepted

Selectable manual ON, OFF and automatic dosing control with indicator
Built-in auto-diagnostic function for offset and slope
Both 4-20 and 0-20 mA output user selectable, all in one instrument
Backlit LCD
Transparent splash-proof cover included
Operational mode LED indicators

HI 8931 is a panel mounted conductivity controller designed for simplicity of use. For in-line applications, use the HI 7635 probe, while for tanks the HI 7638 with external threads is recommended. These probes are provided with a built-in NTC sensor for temperature compensated conductivity measurements.

HI 8931 also features a direct connection up to 20 m (67′), without needing to amplify the signal to the conductivity probe.

Using the HI 8931 in conjunction with a 4-20 mA output transmitter (HI 8936 or HI 8936L series) will assure a strong, interference free signal at distances up to 300 meters (1000′).

Order Information:
The HI 8931 series is supplied with mounting brackets and instructions.

Product Manuals

Manual: Download

Specification :

Range		0 to 1999 µS/cm
Resolution		1 µS/cm
Accuracy @ 20°C		±2% F.S. (excluding probe error)
Input from Transmitter		HI 8936C / CL
Temperature Compensation		automatic, 0 to 60°C with ß=2%/°C; see also transmitter HI 8936
Inputs		DIN (probe) or 4-20 mA (transmitter)
Conductivity Probe		HI 7635 for in-line applications or HI 3001D for flow-thru (not included)
Calibration		manual, two point, through offset and slope trimmers
Recorder Output		0 to 20 mA or 4 to 20 mA (isolated)
Setpoint and Alarm Relay		1, Isolated, 2A, max. 240V, resistive load, 1,000,000 strokes
Setpoint Range		0 to 1999 µS/cm
Alarm Range		0 µS and 1000 µS
Dosing Control		OFF/AUTO/ON with selection switch
Over Dosing Control		adjustable, from 5 min to 60 min with knob or disable by wire strap – on rear panel
Backlight		continuous on
Power Supply		115 VAC ±10% or 230 VAC ±10%; 50/60 Hz
Enclosure		flame retardant ABS body and front panel; transparent splash-proof front cover
Environment		-10 to 50°C (14 to 122°F); RH max 95% non-condensing
Panel Cutout		141 x 69 mm (5.6 x 2.7″)
Weight		1 kg (2.2 lbs.)