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.