Enraf 877

Honeywell Enraf 877 Field Indicator | Field Display & Interface

The Honeywell Enraf 877 Field Display & Interface (FDI) is a field indicator, which can be used to indicate the measured level and, if selected, the temperature from its related level gauge. This level gauge can be one of the Honeywell Enraf series servo gauges (model 854 ATG or 854 XTG) or one of the Honeywell Enraf series radar gauges.

Optionally, the indicator can be provided with an RPU board (Relay Processor Unit), which provides the indicator with two hard alarm SPDT output contacts for level alarms.

A transmission line relay on the RPU board provides for the fall back mode. Then the indicator automatically polls the level gauge when the host is out of service.

Honeywell Enraf’s 877 Field Display & Interface Unit (FDI) provides tank inventory information in the fi eld, where it is needed. It is a versatile, EEx-d approved instrument with several interface options, which can even be part of W&M approved applications. The design of the FDI is therefore based on reliable and uninterrupted data supply in all circumstances. The unit can be used in stand alone mode using the Enraf Bi-phase Mark communication protocol for direct connection to any Honeywell Enraf gauge, or any other gauge using this standard communication protocol in tank farms. The unit will interrogate the gauge and display its measured data.