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.
| Range | 0.0 to 199.9 mS/cm | |
| Resolution | 0.1 mS/cm | |
| Accuracy @ 20 °C | ±2% F.S. (excluding probe error) | |
| Input from Transmitter | HI 8936A / AL | |
| 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 | 0.0 to 199.9 mS/cm | |
| Alarm Range | 0.0 mS and 100.0 mS | |
| 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.) |
| Range | 0.0 to 199.9 mS/cm | |
| Resolution | 0.1 mS/cm | |
| Accuracy @ 20 °C | ±2% F.S. (excluding probe error) | |
| Input from Transmitter | HI 8936A / AL | |
| 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 | 0.0 to 199.9 mS/cm | |
| Alarm Range | 0.0 mS and 100.0 mS | |
| 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.) |
| HI 7033L | 84 µS/cm EC Solution, 500 mL Bottle |
| HI 7031L | 1413 µS/cm EC Solution, 500 mL Bottle |
| HI 7030L | 12880 µS/cm EC Solution, 500 mL Bottle |
| HI 7034L | 80000 µS/cm EC Solution, 500 mL Bottle |
| HI 7035L | 111800 µS/cm EC Solution, 500 mL Bottle |
| HI 7039L | 5000 µS/cm EC Solution, 500 mL Bottle |
| HI 3001D | Flow-thru Conductivity Probe with DIN Connection and 3 m cable |
