` MRC 7700 Circular Chart Recorder


MRC 7700 Circular Chart Recorder

10" circular chart recorder for relative humidity and temperature applications

This product is no longer available. Please contact us today
at 800-567-8686 for alternative solutions.

Can We Help You?


Our product experts are here to help you find the right solution for your application!

The 10" microprocessor-based Partlow MRC 7700 circular chart recorder is capable of measuring, displaying, recording, and controlling relative humidity and/or temperature using Dry Bulb and Wet Bulb temperatures from a variety of inputs. With its automatic calculation feature, the Partlow MRC 7700 circular chart recorder eliminates the need to use charts, graphs, and arithmetic to manually figure relative humidity.

The Partlow MRC 7700 circular chart recorder uses a special algorithm to calculate relative humidity and compensate for barometric pressure changes and temperature differences, which increases accuracy and saves time. Using the wet-bulb/dry-bulb sensing rather than a humidity sensor, the Partlow MRC 7700 circular chart recorder operates efficiently and accurately even in elevated ambient temperatures and dirty environments that normally harm humidity sensors.

Partlow MRC 7700 circular chart recorders also offer many valuable features including auto transfer, position proportioning output, remote setpoint, remote run/hold, auto/manual operation, and setpoint lock-out. Other features of the Partlow MRC 7700 circular chart recorder include 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, and 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 are also featured on the Partlow MRC 7700 circular chart recorder.

In addition, the Partlow MRC 7700 circular chart recorder 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.

• 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
• RS-485 communications option
• Security lockout of keypad prevents unauthorized or accidental changes
• Available as a dual pen 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
• This model complies with Section 1065 of ARRA-09 requirements

Operating Temperature 32 to 122F (0 to 50C)
Storage Temperature 40 to 149F (40 to 65C)
Humidity 0% to 90% non-condensing R.H
Vibration 0.5 to 100Hz @ 0.2g.
Volts 05 VDC; 15 VDC
DC Milliamps 420mA, 020mA
Relay SPST/SPDT; 115VAC 5.0A Resistive, 1/
8HP, 250VA; 230VAC 2.5A Resistive, 1/8HP,
Chart Accuracy Recording: 0.5% of span. Chart Rotation: 0.5% of rotation time
NEMA 3 Enclosure Optional CE compliance optional
Width 15.13˝ (384mm)
Depth 3.63˝ (92mm)
Height 13.19˝ (335mm)
Weight 20 lbs (9.1kg)
Safety L 1092 File E67237; CSA Spec C22.2 File
LR39885, CE EN61010-1 1993/1995

The Partlow MRC 7700 circular chart recorder's control, recorder, and security functionality are designed specifically for Relative Humidity applications including:
• Process validation and trend analysis
• Relative humidity
Appropriate industries for the Partlow MRC 7700 circular chart recorder include oven, chamber, furnaces, heat treating, food processing, and harsh water environments.

Required for mounting Partlow MRC 7000, MRC 7700 and MRC 7800 series chart recorders to a wall
Normally ships in 1-2 Weeks
$144.00 CAD
Partlow five pack of pens, green or red for chart recorders ARC 4100, MRC 5000, and MRC 7000
Normally ships in 1-2 Weeks
Starting At
$45.00 CAD
Available in many range and time options
Normally ships in 1-2 Weeks
Starting At
$45.00 CAD