I
NTRODUCTION
The EV-97 is a microprocessor controlled display unit for use with standard 4 to 20 mA signals for unive r s a l
a p p l i c a t i o n. It is self-powered directly from the two-wire current loop. The measured value is displayed on a
4-digit LCD display, with a maximum range of -1999 to +9999 digits.
The EV-97 is designed for connection to any transmitter with a two-wire 4 to 20 mA output signal. The ope-
rating display range can be set up directly without requiring calibration equipment, by simply entering the
maximum and minimum range limits and the decimal point position. These values are entered on three inter-
nal buttons, accessible after removing the front cover. All the programmable parameters are saved on
EEProm, which will store the values for at least 10 years without power.
The EV-97 has a self-diagnostic system which tests for “sensor damage”, “short circuit” and values falling
outside previously set limits. This ensures maximum operational reliability.
Prior to delivery, the EV-97 is tested and calibrated to your instructions. However, make sure you configure
the unit to your specific requirements. Please refer to the section on “Configuration”.
In order to exclude any risk to the operator, the following points should be observed:
a) Immediately switch off the unit in the case of any visible damage or obvious malfunction.
b) Always disconnect the voltage source from the unit before opening it.
c) Standard regulations for opening and safety for electrical light and heavy current equipment have to
be observed, with particular attention having to be paid to national safety regulations (e.g. VDE 0100).
d) When connecting the EV-97 to other transmitters with different wiring (e.g. with GND connected to
protective earth) beware of undesirable voltage potentials.
Attention: When running electric devices, parts of these devices may be highly energised. Unless the
warnings are observed, serious personal injuries or damage to property may result. Skilled person -
nel only should be allowed to work with this unit. For trouble-free and safe operation of the unit, plea -
se ensure professional transport, storage, installation and connection as well as proper operation
and maintenance.
S
AFETY ADVICE
EV-97
O
PERATING
M
ANUAL
08.2006
KELLER
