USER MANUAL
400DH
MRU GmbH, D-74172 Neckarsulm
9 / 14
4
Interchangeable sensors with technical specs
4.1.
Leak detection on gas installations
The change sensor HC400 is used to locate gas leaks from CH
4
in installations. With
the change sensor HC401 it is also possible to search for C
3
H
8
and with the change
sensor HC402 it is also possible to search for H
2
gas leaks.
After the warm-up time of 30 seconds, the measuring window opens automatically
and the measurement begins.
If necessary, reset the zero point with the F2 key.
Slowly guide the sensor along the points to be tested. If there is a leak, the meas-
ured value changes and the flashing frequency of the red LED in the sensor foot in-
creases with the increase in the measured gas concentration..
Functions in the Context menu:
function
explanation
Signal ON (Key F1)
With this function the signal is switched on.
Signal ON (Key F1)
With this function the signal is switched off.
Zero point (Key F2)
With this function the sensor is zeroed.
Max = 0 (Key F3)
The value Max is set to zero.
Setting
Setting units and Signal thresholds
Printout (Dr)
Printout is generated, a printer is required for this
function.
Meas. menu (ESC)
Exit measuring program
Info
The information (sensor name, page number, firmware
version) about the sensor is displayed here.
Choice ( >>) ( <<)
„Arrows right/left“
HC401:
Switching between CH
4
, C
3
H
8
HC402:
Switching between CH
4
, C
3
H
8
and H
2
Settings:
To trigger signals (signal ON /signal-OFF) for CH
4
, C
3
H
8
and H
2
the desired
signal thresholds must be set separately for each gas in the context menu/settings.
Gas
Adjustable Signal thresholds
CH
4
[ppm]
10 … 500 ppm
CH
4
[%]
0,001 … 0,050 %
CH
4
[% LEL]
0,02 … 1,14 % LEL
C
3
H
8
[ppm]
10 … 500 ppm
C
3
H
8
[%]
0,001 … 0,050 %
C
3
H
8
[% LEL]
0,06 … 2,94 % LEL
H
2
[ppm]
10 … 500 ppm
H
2
[%]
0,001 … 0,050 %
H
2
[% LEL]
0,03 … 1,25 % LEL
Technical Specification:
Sensor HC40X
range
resolution
response time
CH
4
-sensor
0 … 44.000 ppm
1 ppm
< 5 Sec.
C
3
H
8
-sensor
0 … 17.000 ppm
1 ppm
< 5 Sec.
H
2
-sensor
0 … 40.000 ppm
1 ppm
< 5 Sec.
DANGER
Danger due to improper use
Non-compliance with the measurement rules can result in fatal
accidents.
The meter may only be used for advertising purposes to locate
gas leaks in the installation area.
