Product information "HI8931CN Conductivity Controller (1 uS/cm resolution) with Input from Probe or Transmitter"
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
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').
The HI 8931 series is supplied with mounting brackets and instructions.
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
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)
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.)