Partlow MRC 7700 Relative Humidity Circular Chart Recorder

• Direct reading of % RH eliminates the need for look up tables and lengthy calculations.
• Wet bulb/ Dry bulb sensing allows for the device’s use in elevated ambient conditions and/or dirty installations.
• Compensates for changes in barometric pressure and differences in temperature which increases accuracy and reduces operator interface time.
• RS-485 communications option.
• Security lockout of keypad prevents unauthorized or accidental changes.
• Available as a single or dual pen recorder, recording controller, or recording profile controller.
• 24V DC transmitter power supply for use with mA DC input provides additional flexibility.
• UL, CE, and CSA approvals ensures standards of quality and performance.

The MRC 7700 Relative Humidity Recorder / Controller / Profiler records, controls, and profiles relative humidity and/or temperature using dry bulb/wet bulb temperatures, from a variety of inputs, on a circular chart. The calculation of R/H and compensation for barometric pressure changes and temperature differences using a special algorithm increases accuracy and saves time. Using the wet-bulb/dry-bulb sensing rather than a humidity sensor, the recorder operates efficiently and accurately even in elevated ambient temperatures and dirty environments that normally harm humidity sensors.

The MRC 7700 Relative Humidity Recorder / Controller / Profiler also offers many valuable features: auto transfer, position proportioning output, remote setpoint, remote run/hold, auto/manual operation, setpoint lock-out, output limiting, ten-inch circular chart, displays for each process value, no DIP switches, full parameter programming with large tactile keys, up to six-events, relay outputs or SSR drivers, two alarms per channel (process/deviation/deviation band reverse or direct), eight profiles with six ramp/soak segments each, and process value retransmission. In addition, it has a security enable mode system feature which protects all parameters and data from unauthorized changes. Each version may be specified with an RS-485 communications option for easy access to process variables via your computer.