DWYEROMEGA / OMEGA CT7100 1-Pen Circular Recorder

The Dwyer/Omega CT7100 is a microprocessor-based circular chart recorder that measures, displays, and records process variables in real time. This single-pen instrument accepts thermocouple, RTD, mVDC, VDC, and mADC inputs with automatic linearization and cold junction compensation. A 10-inch (250 mm) circular chart and 4-digit LED display provide simultaneous recording and instantaneous value indication. Chart rotation speed is programmable from 0.1 to 168.0 hours per revolution, making it suitable for both rapid transient capture and extended trending applications.

Technical Specifications

Chart Size: 10 inches (250 mm) diameter

Input Types: Thermocouple (J, K, T, E, N, R, S, B, C), RTD, mVDC, VDC, mADC

Display: 4-digit LED per pen

Recording Pen: Single-pen configuration; red disposable fiber-tip pen

Chart Rotation Speed: 0.1 to 168.0 hours per revolution in 0.1-hour increments

Pen Response Time: 20 seconds to full-scale deflection

Accuracy: ±0.25% of span @ 25°C (77°F); ±0.5% of span deviation from 25°C; ±1.0% of chart span maximum overall

Display Resolution: Thermocouple/RTD: 0.1 or 1°; mVdc/Vdc: 0.001, 0.01, 0.1, or 1

Process Filter: Programmable averaging from 1 to 20 scans

Operating Temperature: 0°C to 55°C (32°F to 131°F)

Key Features

Signal conditioning includes automatic thermocouple linearization and cold junction compensation

Dual alarm settings per pen; configurable as process high/low, deviation from setpoint, or deviation band with user-selectable hysteresis

Sensor fault detection displays "Hi" or "Lo" for inputs deviating beyond 10% of span

Optional on/off and PID control capabilities with SPST relay, SSR driver, or 4–20 mA DC output (user configurable to 0–20 mA DC)

Optional isolated 24 VDC regulated transmitter power supply for up to two 4–20 mA sensor transducers

Battery-backed memory protection against AC power loss

Enable mode security system prevents unauthorized parameter changes

Self-compensating calibration for ambient temperature variations

Typical Applications Process monitoring and recording across pharmaceutical, chemical, HVAC, food processing, and industrial manufacturing environments where multirange input flexibility and extended chart operation are required.

Compatibility & Integration The CT7100 interfaces with standard thermocouple and RTD sensors. Optional 4–20 mA DC retransmission output enables integration with SCADA systems and data acquisition platforms. Panel mounting accommodates standard enclosure cutouts per manufacturer specifications.