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MCJ
Miniature Electronic Ice Point
Conversion of voltages from thermocouples to signals referenced at 0°C
Excellent stability of ± 1°C over the entire operating range of 10 to 45°C
Compatible with any standard offset connector or socket
Can be used in reverse mode to check the operation of thermometers and other instruments directly connectable with a thermocouple
Product Overview
- Accuracy ± 1 °C (± 1.8 °F)
- Accuracy Detail 0.5°C from 15 to 30°C; 1°C from 10 to 45°C
- Alloy Material (-) Iron
- Alloy Material (+) Constantan
- Color Options Black
- Height 2.94 in
- Impedance Output 200 Ω
- Length 0.5 in
- Operating Temperature, Max 45 °C
- Operating Temperature, Min 10 °C
- Reference Temperature 0 °C
- Series ID MCJ
- Storage Temperature, Max 75 °C
- Storage Temperature, Min -25 °C
- Storage Temperature Note -25 to 75°C (-13 to 167°F) (without battery)
- Weight 57 g
- Width 1 in
Supported Applications
The Omega MCJ Series Miniature Electronic Ice Point is a cold junction compensator designed to convert thermocouple voltages into 0°C referenced signals. It provides the electrical equivalent of an ice bath reference at 32°F (0°C) for use with digital multimeters (DMMs), voltage recorders, and other electronic devices that require temperature measurement via thermocouples.
The device is also utilized as a precision millivolt source to calibrate thermocouple meters. It supports nine standard thermocouple calibrations: J, K, T, E, R, S, G, C, and D.
Operating Conditions & Performance
The MCJ Series operates within an ambient temperature range of 10 to 45°C. Accuracy specifications are defined by the operating environment:
- Accuracy: 0.5°C from 15 to 30°C; 1°C from 10 to 45°C.
The unit features a reference temperature setting of 0°C (32°F) and maintains high stability, performing better than ±0.2°C at any stabilized temperature over the full 10 to 50°C range for related series configurations. The output impedance is less than 250 Ω standard.
For storage without a battery, the device tolerates temperatures from -25 to 75°C (-13 to 167°F). The compact physical dimensions are 75 H x 25 W x 13 mm D (2.94 x 1 x 0.5"), with a weight of 57 g (< 2 oz).
Configuration Options
The MCJ Series is available in specific thermocouple calibration types, each identified by a distinct color code for quick identification:
- J (Iron/Constantan): Black
- K (Chromega®/Alomega®): Yellow
- T (Copper/Constantan): Blue
- E (Chromega®/Constantan): Violet
- R and S: Green
- C* (W-5% Re/W-26% Re):** Red
- D* (W-3% Re/W-25% Re):** Red/white
The device connects via a standard thermocouple connector or jack and includes female-to-male adaptor pins. It is battery-powered, with replacement batteries available as the MCJ-BATT-B accessory.
Accessories and Replacement Parts
- Battery: MCJ-BATT-B (Replacement battery)
- Retro-fit Kits for Pre-1996 Units:
- MCJ-BATT-R-A: For J, K, T, E calibrations
- MCJ-BATT-R-B: For R, S calibrations
- MCJ-BATT-R-D: For C, D calibrations
Note: Units manufactured prior to April 1995 may require retro-fit kits to replace mercury batteries. MCJs manufactured before 1996 use a different battery and compartment configuration.
Key Product Differences
The primary variation within the series is determined by the thermocouple calibration type (J, K, T, E, R/S, C, D), which dictates the internal compensation logic and color coding. The MCJ Series differs from the related CJ Series in that the MCJ is a miniature electronic ice point specifically designed for portability with dimensions of 75 H x 25 W x 13 mm D.
While the standard reference temperature setting is 0°C (32°F), notes indicate that CJs are available with reference junction temperatures other than 0°C, up to a maximum of 212°F, for an additional cost. The MCJ Series model numbers follow the format MCJ-, such as MCJ-J or MCJ-K.
The device is intended for use with instrumentation having an impedance of 50K ohms or greater to ensure accurate readings.
Show Ratings & Reviews
Rated 2 out of
5
by
Tech10 from
Functional, but two physical aspects need redesign
These are reliable once they're installed, but the rotary switch and the battery well beneath it are very poorly designed - the battery's diameter is much smaller than the well it goes into, which means trying to situate it in the center while screwing the rotary knob onto it is a balancing act; the knob itself is crudely-fashioned, very difficult to turn, and inexact in its positioning. The worst aspect - perhaps because it would be the simplest to design properly - are the fasteners beneath the cover at the base. The screw travel once the threads finally engage is extremely short, which means attempting to connect anything but the tiniest wire gauge is going to get you stripped threads, leaving soldering directly to the holes the only remaining connection method - a whole lot of additional work nobody needs. I would be much happier to pay a little more for a reasonably-robust design. The current design reminds me of a '70s-era children's toy - a real chore to install without destroying, and needlessly delicate in normal usage.
Date published: 2018-08-02
Rated 5 out of
5
by
Jorge M from
very good perfomance of ice point
I bought a miniature electronic ice point a month ago, and then all the measurments in the lab are well controlled
Date published: 2017-08-12