Transmitter reduces cost of hazardous area temperature measurement & display

Transmitter reduces cost of hazardous area temperature measurement & display

August 2010

PR 0210

For Immediate Publication

Transmitter reduces cost of hazardous area temperature measurement & display

As part of their new range of HART® loop powered indicating temperature transmitters, BEKA have introduced a field mounting, Ex n certified model with a galvanically isolated Ex ia intrinsically safe sensor input. This combined certification permits the BA474ND transmitter to be installed in Zone 2 or 22 hazardous areas and to be directly connected to a temperature sensor in any gas or dust hazardous Zone, all without the need for Zener barriers or galvanic isolators, thus significantly reducing equipment and installation costs.

Incorporating a 20mm high five digit display plus a 31 segment bargraph, the new BA474ND indicating temperature transmitter provides both a large easy to read local temperature display, together with accurate 4/20mA analogue and HART® digital outputs for direct transmission to non-hazardous areas. The transmitter is housed in a robust IP66 GRP enclosure with an armoured glass window suitable for installation in harsh industrial and offshore environments. A separate terminal compartment with forward facing terminals simplifies installation and maintenance.

ATEX and IECEx Ex nA, nL and tD certification allows the BA474ND indicating temperature transmitter to be installed in Zones 2 gas and 22 dust hazardous areas without the need for Zener barriers or certified isolators. The sensor input has been certified as a separate galvanically isolated Ex ia intrinsically safe circuit with defined input and output safety parameters, allowing direct connection to earthed or floating resistance thermometers, thermocouples, voltage sources and resistance transducers located in Zones 0, 1, 2, 20, 21 and 22.

The HART® Communications Foundation has verified that the BA474ND complies with the latest HART® protocol standard revision 7, including diagnostics that monitor the health of both the transmitter and the sensor. Transmitter configuration may be performed via the HART® digital communication or push buttons located behind a separate sealed cover. When frequent local adjustments are required the transmitter can be supplied with an external membrane keypad.

The transmitter will operate with three or four wire resistance thermometers and with most common types of thermocouple to provide a display in °C, °F or K. Voltage outputs from bridges such as load cells and resistive position transducers may also be directly connected to the transmitter and displayed in engineering units. For applications in poorly illuminated areas, an optional loop powered display backlight is available which does not require additional field wiring.

Transmitter applications are further extended by optional dual alarms that may be used to control Zone 2, 22 or safe area loads such as beacons and sounders. An alarm accept facility is included allowing an alarm to be silenced for a predetermined time.

Accessories include pipe mounting kits and display escutcheons printed with customer specified application and tag information; alternatively for applications requiring a stainless steel tag, the transmitter can be supplied with a custom etched stainless steel legend plate secured to the front of the instrument.

As with all BEKA products, these new transmitters are supplied calibrated to customer requirements free of charge and have a three year guarantee. For customers wishing to evaluate a new BA474ND indicating temperature transmitter, BEKA operate a free three month sale or return evaluation service.

For further information including datasheets, certificates and instruction manuals please visit or phone the BEKA sales office on +44 (0) 1462 438301

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