The HI 8666 RH/°C TRANSMITTER is an instrument with sensor and measurement functions used for measuring relative humidity and temperature. It features high accuracy, ease of operation, and maintenance. Please read the manual carefully for correct operation and maintenance.
The HI 8666 is a compact transmitter designed for on-site, continuous monitoring of relative humidity and temperature in critical or controlled environments. It features a removable sintered cap to protect the sensor and outputs a 4-20 mA analog signal powered by separate external voltage sources. The device is compliant with EMC directives and requires specific handling to avoid damage from electrostatic discharges or high voltages.
| Range RH | 0% (4 mA) to 100% (20 mA) |
|---|---|
| Range Temperature | -20°C (4 mA) to 60°C (20 mA) |
| Accuracy RH | 2% (5 to 95% RH) |
| Accuracy Temperature | 1% FS |
| Response Time | 6 seconds without sintered filter; 60 seconds with filter |
| Output Signal | 4 to 20 mA |
| Environment | 0 to 60°C (32 to 140°F) |
It is generally recommended to have the RH transmitter recalibrated at least once a year.
The reading should be 5.78 mA, representing the theoretical chamber value of 11.1% RH.
The multimeter reading should be 16.06 mA, representing the theoretical chamber value of 75.4% RH.
The calibration kit needs approximately 4 hours for stabilization.