Button Functions In Measuring Mode; Calibration; Replacing The Sensor Head; Fault Messages - Herth+Buss ELPARTS 95980002 Notice D'emploi

2.8

Button functions in measuring mode

The right-hand button has a double function:
1st function level:
Press button until a short acoustic signal can
be heard. Release button
2nd function level:
Keep button pressed for longer until 2 brief
acoustic signals can be heard. Release button.
Upper button:
Switch backlighting for LCD and buttons on and off. The backlighting
always switches on automatically after a delay of 15 seconds:
after the device has been switched on and the heat-up phase
has been completed;
every time a function button is pressed.
The backlighting can be switched on permanently by the upper
button. Two LEDs are designed for illuminating the LCD. One LED
is designed for the keypad.
Right button:
1st function level: Switch the acoustic alarm on and off in
measuring mode
In calibration mode: acknowledgement button
2nd function level: Reset catch mode after the lower explosion
limit has been exceeded
The right-hand button is used to switch the alarm signal on and off.
The current state (alarm signal on or off) can be seen in the display in
the special loudspeaker segment. On the 2nd function level, the catch
mode is reset after the lower explosion limit has been exceeded. CLr
appears on the display for 2 seconds. In calibration mode, the right-
hand button is used to confirm the individual calibration steps.
Left-hand button:
1st function level: Currently set gas type H2 is faded in
2nd function level: Set concentration output to background
concentration (switch between absolute and
relative measurement)
On the 2nd function level, the concentration output is set to the
current concentration. Max. 250 ppm can be suppressed, however.
The special segment SET appears on the display.
Lower button:
Switches the device on and off.
3

Calibration

We recommend having the device monitored and recalibrated once a
year by the manufacturer or specially instructed staff.
4

Replacing the sensor head

Every device has had a certain sensor head assigned for calibration
before delivery. When the sensor head is replaced, e.g. during retro-
fitting with a replacement sensor, re-calibration is required.
5

Fault messages

When the battery voltage is low, the special sign (battery) appears on
the display and the "operation" LED flashes. In this state, the device
can be used for at least another 15 minutes.
The device checks the sensor values for plausibility both in measu-
ring mode and in calibration mode. In addition, the parameter store
is tested for data validity every time the device is switched on. If a
fault is detected, the respective fault code is displayed.
15