Herth+Buss SelectH2 Bedienhinweis Seite 7

Operating Instruction
Content
EN
Chapter
1. Introduction
1.1 Applications
1.2 Terms and dimensions
1.3 SelectH symbols
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2. Operation
2.1 Operating controls
2.2 Putting the device into operation
2.3
Heat-up phase sequence
2.3.1 Light-emitting diode chain displays
2.4 Measuring operation
2.5 Functional check before starting work
2.6 Automated switching to other measuring ranges
2.7 Exceeding the LEL and alarm signal
2.8 Button functions in measuring mode
3. Calibration
4. Replacing the sensor head
5. Error messages
5.1 Error codes
6. Charging the battery
7. Device-related requirements in accordance with DVWG G 465-4 and technical data
7.1 General device-related requirement in accordance with DVGW G 465-4
8. Leak detection on the A/C system
8.1 Measuring range [ppm]
8.2 Detecting leaks
8.3
"Feeling around" the pipe using the SelectH
9. Brief instructions
10. Service address
www.herthundbuss.com
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Operating Instruction
1. Introduction
1.1 Applications
The SelectH gas detector is a selective and
2
sensitive hydrogen gas detector. Indication
on the display ranges from 0 ppm up to the
lower explosion limit (LEL) of the gas. The
range is stored in the microprocessor and
can be requested through selective sen-
sors. The SelectH is equipped with a suction
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pump, a GGS 1000 and GGS 6000.
1.2 Terms and dimensions
ppm
Stands for parts per million = number of
parts per million other parts, a customary
value for smallest quantities in gas detec-
tion. 1 ppm is the quantity of 1cm3 gas in
1m3 of air. 1ppm = 0.0001 vol%, therefore
0.1% gas = 1000 ppm.
Lower explosion limit LEL
At certain values in a mixture with air, differ-
ent depending on the type of gas, combusti-
ble gases reach a point at which the influence
of an ignition source results in an explosive
ignition. This is referred to as the lower explo-
sion limit (or sometimes lower flammable
limit "LFL ") and is 4.0 vol% for hydrogen. This
means that relatively small quantities are
enough to create a flammable mixture. The
following figure shows this using a room as
an example. Gradual filling with gas results
in the value of 4.0% being reached quickly.
The range from 0% gas to the LEL is divided
into % of the LEL. 4.0% hydrogen in air cor-
responds to 100% of the LEL.
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The SelectH uses acoustic signals to indi-
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cate that this LEL value is being approached.
LEL: Lower explosion limit
UEL: Upper explosion limit
1.3 SelectH symbols
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Contact the equipment supplier
for details on how to properly
dispose of this product within
specific country, per WEEE re-
quirements.
Technical data:
EN