The Omega CT7000 is a microprocessor-based circular chart recorder that measures, displays, records, and controls up to two independent process variables. Built around a 254 mm (10″) circular chart and dual 4-digit LED displays, it accepts thermocouple (J, K, T, E, N, R, S, B, C), RTD, and DC voltage/current inputs. Three front-panel keys enable instrument configuration with user-selectable display resolution and 1 to 20 scan averaging filters.
Technical Specifications
Input Ranges:
• Thermocouple J: 0 to 760°C (0 to 1400°F)
• Thermocouple K: 0 to 1360°C (0 to 2500°F)
• Thermocouple T: -220 to 400°C (-330 to 750°F)
• Thermocouple E: 0 to 750°C (0 to 1400°F)
• Thermocouple N: 0 to 1300°C (0 to 2370°F)
• Thermocouple R: 200 to 1650°C (400 to 3000°F)
• Thermocouple S: 200 to 1650°C (400 to 3000°F)
• Thermocouple B: 200 to 1800°C (400 to 3300°F)
• Thermocouple C: 200 to 2300°C (390 to 4170°F)
• RTD 100 Ω (0.00385 Ω/Ω/°C): -140 to 400°C (-220 to 750°F)
• DC Voltage: 0–25 mV, 0–50 mV, 10–50 mV, 0–5 V, 1–5 V
• DC Current: 4–20 mA
Performance:
• Measurement error (J, K, T, E, N, RTD): ±0.25% of reading + 1° @ 25°C (77°F)
• Measurement error (R, S, B, C thermocouple): ±0.25% of span @ 25°C (77°F)
• mVdc and Vdc error: ±0.25% of scaled span plus 1 least-significant digit
• Ambient temperature error: 0.01% of span per °C deviation from 25°C (77°F)
• Process value output error: ±0.5% of span
• Pen response (full-scale deflection): 20 s
• Pen resolution: 0.15% of chart span
• Recording deadband: 0.3% of chart span
• Self-compensating calibration drift over ambient temperature
Physical:
• Dimensions: 335 mm H × 384 mm W × 92 mm D (13.2″ × 15.1″ × 3.6″)
• Panel cutout: 321 mm H × 343 mm W (12.6″ × 13.5″)
• Weight: 9.1 kg (20 lb) maximum
• Power consumption: 25 VA maximum
– Key Features
Each of the two pens includes dual independently programmable alarms configured as process high/low, deviation from setpoint, or deviation band with adjustable hysteresis. Optional control outputs include SPST relay (115 Vac/230 Vac at 250 VA), SSR driver (open-collector), and 4–20 mA DC or 0–20 mA DC into 650 Ω. PID control parameters include proportional band (1–3000 units), manual reset (−1500 to 1500 units), rate/derivative (0–10 min), and cycle time (1–240 s). Process values can be retransmitted via optional 4–20 mA DC output. Integrated 24 Vdc transmitter power supply delivers up to 40 mA. Digital communications available as an option.
– Typical Applications
Industrial process monitoring and control in thermal management, furnace operation, temperature profiling, and multi-point data logging where dual-variable simultaneous recording and alarm handling are required.
