15
OVERRANGE, UNDERRANGE AND BURN-OUT
INDICATIONS
The instrument shows the OVERRANGE and
UNDERRANGE conditions with the following
indications:
Overrange
Underrange
The sensor leads break can be signalled as:
- for TC input
: OVERRANGE or
UNDERRANGE If required see
Chromalox for set up.
- for RTD input : OVERRANGE
Sensor leads short circuit detection:
On RTD input, a special test is provided to signal
OVERRANGE when input resistance is less than
15 ohm (Short circuit sensor detection).
NOTE
: When:
- The instrument is set for one output only and an
OVERRANGE is detected, the OUT 1 turns OFF
(if reverse action) or ON (if direct action).
- The instrument is set for one output only and an
UNDERRANGE is detected, the OUT 1 turns
ON (if reverse action) or OFF (if direct action).
NOTE:
when an overrange or an underrange is
detected, the alarm operates as if a
maximum or a minimum measurable
value is present.
To eliminate the OUT OF RANGE condition,
proceed as follows:
the next instrument start up.
ERROR MESSAGES
1601-1-0C.p65
5/2/00, 1:45 PM
15