The Thornton 200CR manual provides installation, operation, calibration, and maintenance instructions for the conductivity/resistivity instrument.
The 200CR Conductivity/Resistivity Instrument is a process‑control device that measures solution properties such as conductivity, resistivity, temperature, and total dissolved solids. The manual covers safety information, installation options (panel, wall, or pipe mounting), electrical connections, and configuration of relays, analog outputs, and communication interfaces.
Operational guidance includes menu navigation, sensor installation, measurement selection, setpoint programming, and troubleshooting. Service sections describe fuse replacement, spare parts, and detailed technical illustrations, while the specifications chapter lists performance, environmental, and electrical parameters.
| Conductivity range (0.1 Constant Sensor) | 0.02 µS/cm to 600 µS/cm |
|---|---|
| Resistivity range (0.1 Constant Sensor) | 0.0017 MΩ·cm to 50 MΩ·cm |
| Temperature range (operating) | -10 °C to 55 °C |
| Measurement update rate | once per second |
| Relays | 2 SPDT relays (optional 2 solid‑state AC relays) |
| Analog output signals | Two optional 4‑20 mA outputs |
| Power input options | 115 VAC, 230 VAC, or +24 VDC |
| Display | 1‑line × 16‑character backlit LCD |
| Weight | 1.9 lb (0.9 kg) |
The 200CR can operate from 115 VAC, 230 VAC, or a +24 VDC supply, with jumpers used to select the desired voltage.
All measurement parameters are updated once per second.
The instrument is rated for operation between –10 °C and 55 °C.