Ceramic measuring elements for more varied measuring media, intelligently combined with efficient microprocessor electronics for increased accuracy, form the basis of the new Keller 41 X pressure transmitter series available from Instrotech. With a digital RS485 interface, the millibar (100 Pa) transmitters can achieve resolutions of up to 1 μbar (0,1 Pa).
The Series 41 X has an electronically-adjustable scale for low pressure measuring ranges from 0-30 mbar (0 to 3 kPa) to 0-300 mbar (0 to 30 kPa), in three stages, and are subject to an extensive calibrating process at Keller AG. The coefficients recorded in this manner are saved in an EEPROM and used for electronic linearisation and sensor characteristic curve compensation relative to temperature influences (400 times a second with the new calculation of a fourth degree polynomial). Each of the three measuring ranges is spread by up to 1/10 of the margin using this sophisticated form of compensation. An overall error band of ±0,1% is typically specified for the temperature compensation range of 10 to 50°C.
The microprocessor evaluates the current pressure signal every 250 ns during operation and, additionally, the temperature signal every four seconds. This ensures an increased measuring dynamic. However, strict digital internal signal processing enables the user to limit the received signal dynamic to between 0,01 Hz and 400 Hz per software command with low pass filters. Prog3O software is provided for this and other device parameters (eg, the pressure range to be applied to the analogue signal).
Conventional analogue output signals, selectively 4 to 20 mA (2-wire) or 0 to 10 V (3-wire), are provided by Keller transmitters via D/A transformers. Sophisticated 16-bit resolution ensures high precision.
The digital structure enables direct linking of two transmitters for measuring filling levels in pressure containers and direct provision of the filling level (differential pressure) as a signal. Up to 128 transmitters can also be connected to a bus system via coupling modules and their measuring values recorded and/or evaluated by a PC. In addition to the Read3O software provided by Keller, drivers are also available for linking to conventional measuring data recording programs.
Standard connection of the lightweight transmitter (approx. 190 g) to the measuring medium is via a G 1/4" external thread, with electrical connection via a 5-pole plug (Binder series 723).
For more information contact Dave Howcroft, Instrotech, +27 (0)11 462 1920, [email protected]
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