Supported Applications
The Omega CL541-PLUS is an automated thermocouple calibrator designed for checking, calibrating, and measuring thermocouple instruments and sensors. The device supports compatibility with all process instruments, including smart transmitters, PLCs, DCS, and multichannel recorders.
Engineers use the CL541-PLUS to measure thermocouple sensors in order to troubleshoot connections and detect broken wires or high resistance junctions.
Operating Conditions & Performance
The series supports measurement of Type J, K, T, E thermocouples and millivolts (mV). Output signals are available in °C, °F, and millivolts. The display resolution is 0.1°.
Power is supplied by four 'AA' 1.5V batteries; alkaline batteries are recommended for maximum battery life and performance. Removing the batteries resets values to factory defaults. The unit features a rugged rubber boot housing and includes a backlit display for operation in dark areas.
Configuration Options
The CL541-PLUS series offers configurable output stepping via an adjustable digital potentiometer ('DIAL') for precise temperature setting. Automatic output stepping is available in various increments, with configuration options including step time and auto-off settings accessible through the menu.
• Memory: Stores three preset temperatures for instant recall.
• Connections: Female miniature thermocouple connector (top end of housing) and two banana jacks (top end of housing).
• Housing: Rubber boot enclosure with backlit display.
The device is made in the USA and comes with a 3-year warranty. Approvals include ISO 9001 Certified (Stamford, CT and Manchester, UK) and CE mark (to be added upon certification).
Key Product Differences
The CL541-PLUS is the primary model in this series. The product overview notes that these products are not designed for use in, and should not be used for, human applications.
| Accuracy | ± 0.008 % |
| Accuracy Detail | ± (0.008% of Reading + 0.006 mV) |
| Additional Features 1 | Read & Source Signals |
| Battery Indication | A low battery indication is displayed when the battery voltage drops below the operating level |
| Battery Life | 50 hr |
| Cold Junction Compensation | ± 0.1°F |
| Display Type | LCD |
| Display Type Note | High contrast graphic liquid crystal display, LED backlighting for use in low lit areas |
| Height | 40.64 mm |
| Length | 143 mm |
| Operating Temperature, Min | -25 °C |
| Over-Voltage Protection | Over-voltage protection to 60 Vdc (rated for 30 seconds) |
| Relative Humidity, Max | 0.9 |
| Relative Humidity, Min | 10% |
| Relative Humidity Note | 10% ≤RH ≤90% (0 to 35°C), non-condensing; 10% ≤RH ≤70% (35 to 60°C), non-condensing |
| Series ID | CL541-PLUS-series |
| Supply Voltage | 6 Vdc |
| Thermocouple Type | J, K, T, E |
| Voltage Read | Input Impedance: >10 MΩ Open Thermocouple Threshold: 10,000 Ω nominal Pulse: <10 microamp pulse for 300 milliseconds Normal Mode Rejection: 50/60 Hz, 50 dB Common Mode Rejection: 50/60 Hz, 120 dB |
| Voltage Source | Output Impedance: < 0.3 Ω Source Current: > 20 mA (drives 80 mV into 10 Ω) Noise: ≤4 microvolts p-p for frequencies of 10 Hz or below |
| Weight | 12.1 oz |
| Weight Note | 12.1 oz (including boot and batteries) |
| Width | 76.2 mm |