Circular Chart Relative Humidity Recorders Partlow MRC 7700

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With the MRC 7700 Circular Chart Relative Humidity Recorders, Controllers, Profilers automatic calculation feature the need to use charts, graphs, and arithmetic to manually figure relative humidity is eliminated. Moreover, it compensates for barometric pressure changes and differences in temperature.

The MRC 7700 Circular Chart Relative Humidity Recorders, Controllers, Profilers 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 Circular Chart Relative Humidity Recorders, Controllers, Profilers also offer 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, the MRC 7700 Circular Chart Relative Humidity Recorders, Controllers, Profilers have 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.

Standard features

  • Selectable process value display for each pen: wet bulb, dry bulb, or RH.

  • Compensation for barometric pressure changes

  • 4 Digit display per pen

  • Universal Isolated sensor input: thermocouple, RTD, mA, mV, or V

  • Chart speed from 0.1 to 999.9 hours

  • Disposable fiber tipped pens: red, green

Optional capabilities

  • 2 Programmable alarms per pen

  • Up to 8 relay type outputs

  • Up to four 4-20mA outputs

  • Process value retransmission

  • RS-485 Communications

  • 24V Transmitter power supply

  • Door lock

  • Water-tight enclosure

Optional controller capabilities

  • On-off, time proportioning, or current proportioning

  • Single or dual control output

  • Position proportioning for use with slidewire feedback

  • Relay, SSRD, or mA outputs

  • Remote setpoint input

Optional profiler capabilities

  • Profile one or two pens

  • 8 Profiles, each with 6 ramps and 6 soaks

  • Up to 6 event relay outputs

  • Remote Run/Hold

Key Specifications

  • Measurement accuracy: +/- 0.25%

  • Recording accuracy: +/- 0.5%

  • RH calculation accuracy: typically +/- 1%

  • 1 Scan per second

  • 5A SPST or SPDT Relay outputs

  • 13.19" H x 15.13" W x 3.63" D

  • 115 or 230 (optional) VAC powered

  • 3 Year warranty

Agency Approvals

  • UL Listed

  • CSA Certified

  • CE Compliance (optional)

MRC 7700 Brochure

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Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


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