Honeywell 5701 Operating Instructions Manual page 61

MAN0443.P65 Issue 13 Aug 04
05701-M-5001 A02279
CHAPTER 3 CONTROLS AND FACILITIES
3.3.8 ALARMS Push-button
When the ALARMS push-button is operated, the display of the selected
control card provides an indication of that card's level and type (rising
or falling) of each alarm level (A1, A2, A3, STEL, LTEL).
If the Engineering Key is fitted to the Engineering Card, adjustments
can be made to the alarm levels, within pre-defined limits, and additional
test facilities become available. This facility allows each alarm operation
to be checked and, if required, its associated output relay to be
exercised.
3.3.9 SIGNAL Push-button
When the SIGNAL push-button is operated, the display of the selected
control card provides an indication of that cards sensor signal as
follows:
a. 4 - 20mA Control Card - Loop current in mA.
b. Catalytic Control Card
3.3.10 ZERO Push-button
The ZERO push-button can only be used when the Engineering Key is
fitted to the Engineering Card and is used to calibrate the zero point of
the selected control card.
3.3.11 SPAN Push-button
The SPAN push-button can only be used when the Engineering Key is
fitted to the Engineering Card and is used to calibrate the span point of
the selected control card.
3.3.12 1ST SPAN Push-button
The 1ST SPAN push-button can only be used when the Engineering
Key is fitted to the Engineering Card and is used to calibrate the span
point of a new catalytic sensor fitted to a selected catalytic control
card.
This function is used to provide an indication, in conjunction with
subsequent normal span adjustments, of the output sensitivity of a
catalytic sensor and to automatically indicate poisoning or loss of
sensor performance.
3.3.13 CLOCK Push-button
When the CLOCK push-button is operated, the display of the selected
control card provides an indication of the time and date of the rack
clock.
- Catalytic bridge output (sensitivity) in mV.
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5701 Control System