F-Gas Detector Instructions
4. Operating the transmitter using the key-pad
The control panel (figure 10) of the transmitter is integrated in the front cover. This is
required if zero or span calibration has to be carried out.
The following operating and display functions are available:
Display elements:
STATUS-LED 3-colours (red, yellow, green)
SPAN-LED
LED yellow
ZERO-LED
LED yellow
Operating elements:
UP
button
SPAN
button
ZERO
button
DOWN
button
Figure 10: Display key-pad
The transmitter can be calibrated and several settings can be made using the display key-
pad.
3-colour STATUS-LED indicates the current operating status. Only one of the three colours
is active at any given time. In addition to this, the conditions “off“, ”on“ and ”flashing“ exist.
The SPAN and ZERO LEDs have a special purpose. At any given time, only one of these
two LEDs can be active. The three conditions “off“, ”on“ and ”flashing“ exist here as well.
4.1.
Start-up phase
After the power supply and the selected interfaces have been connected, the transmitter will
begin the start-up phase (
STATUS-LED will flash green
). This will take less than 2 minutes
and this time is used to check all internal components.
During the start-up phase, the analogue value issued shows the minimum value; the
concentration shows ”0“.
Depending on the operating mode selected, the following conditions can occur during the
start-up phase:
In 0-20mA mode
Output current
0mA
. After approx. 2 minutes
, P$
depending on
the pending gas concentration. During the warm-up period, the sensor
signal may still deviate slightly from the exact concentration.
In 4-20mA mode
Output current approx.
2mA
, then a jump to approx.
4mA
. After about
PLQXWHV,P$GHSHQGLQJRQWKHSHQGLQJJDVFRQFHQWUDWLRQ7KH
sensor signal may show values of less than 4mA as it can still deviate
slightly from the exact concentration during the warm-up period.
Once the start-up phase is completed and all the test routines have been carried out with
positive results, the transmitter will change to its regular mode, making the measured gas
concentration available via the interfaces. In case a fault was detected during the start-up
phase, the transmitter will change to the operating mode “faulty” (see 4.3).
SPAN
STATUS
ZERO
