Page
48
Appendix B — Humilab chilled mirror hygrometer
Switches
Display switch.
The
DISPLAY
switch is a three-way switch that
selects:
NEXT
- A momentary position used when viewing or changing
displayed units, output units and scaling.
OPER
- Normal operation.
SELECT
- A momentary position used when viewing or changing
displayed units, output units and scaling.
Display switch operation.
The
DISPLAY
switch is used to change the
units displayed in the main display, view or change units for the
analog output(s). In the Default mode, as shipped from the factory,
the actual analog output scaling can only be modified via the
RS-232 port, to avoid accidentally changing them when changing
displayed units at the front panel. (See
Balance switch.
The
BALANCE
switch is a three-way switch that
selects:
INIT
- A momentary position that initiates a balance cycle, either
PACER
or
AUTO
.
MAN
- No balance cycle unless manually initiated, using
INIT
.
AUTO
- The
PACER/AUTO
cycle occurs automatically at a
pre-selected interval.
on page 54 for details on resetting the balance
interval via RS-232 communication.
Sensor switch.
The
SENSOR
switch is a three-way switch that
selects:
COOL
- A momentary position that initiates maximum cooling of
the chilled mirror sensor in order to verify its depression capability.
OPER
- Normal operation.
HEAT
- An on position that initiates heating of the chilled mirror
sensor in order to clear it of dew or frost and verify proper control
loop operation.
