The new Yokogawa 2553A is a DC calibrator combining precision performance and ease of use for the calibration of measuring instruments including analog meters, thermometers, temperature transmitters and data-loggers.
The successor to the 2553 model, it offers higher performance in terms of range and accuracy, additional temperature measurement options, resistance generation, and a choice of communications interfaces as well as being much lighter.
The new unit features high accuracy, high stability, low noise and high resolution. Intuitive operation is aided by the provision of dials for each digit and switch, and a clear display using traditional 7-segment LEDs. The 2553A can be used with existing 2553 programs, allowing its integration in a system containing a mixture of old and new instruments.
The heart of the calibrator is a DC current/voltage generator with five voltage ranges from 10 mV to 30 V, four current ranges from 1 mA to 100 mA, 10 different types of thermocouple (as specified in IEC standards) as well as Pt100 RTDs (resistive temperature detectors) and a 400 Ω resistance generation range.
By setting a temperature value, the 2553A generates thermocouple electromotive power and can therefore be used to calibrate temperature controllers. It also generates temperature-related resistance values for RTD measurements. Settings can be made by resistance value as well as temperature, making it possible to calibrate using the resistance value.
The unit also offers RJC (reference junction compensation) at the output terminals, with a choice of three modes: internal, external and manual.
User defined temperature calibration can be achieved by copying text files including relationship parameters between temperature and voltage or between temperature and resistance, allowing calibration curves to be generated for various types of thermocouple and RTD.
Text files can be easily created by text editor or Excel on a PC. Files can be easily transferred by drag-and-drop operations when the 2553A is connected to a PC via a USB cable, with the PC recognising its internal memory as a mass storage drive.
The 2553A can also be used to calibrate sensor transformers and transmitters for pressure, volume flow and temperature, as well as environmental parameters such as pH, ORP (oxidation reduction potential), conductivity or dissolved oxygen. It can also simulate two-wire transmitters for 4 - 20 mA signals.
The calibrator measures 132 (H) x 213 (W) x 300 (D) mm, and weighs approximately 3 kg. It comes complete with USB, Ethernet and GP-IB communication interfaces.
For more information contact Trevor Grundlingh, Protea Electronics, +27 (0)11 719 5700, [email protected], www.protea.co.za
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