Calomat 7; Sample Gas Inlet Conditions; Checking The Sample Gas Path For Leaks - Siemens SIPROCESS GA700 Quick Start Manual

Commissioning: Preparation

7.5 CALOMAT 7

7.5 CALOMAT 7
7.5.1

Sample gas inlet conditions

Prevent condensation of the sample gas in the gas path with suitable gas preparation, for
example:
● Connect a cooler or condensate separator upstream of the device.
7.5.2

Checking the sample gas path for leaks

The tightness is checked with air or nitrogen at the operating temperature.
The leak rate is determined in accordance with the pressure drop method. The pressure of
the gas (air or nitrogen) enclosed in the gas line is monitored for a defined period. The size
of the pressure drop is a measure of the tightness of the gas line.
Procedure
1. Connect a pressure gauge (measuring range approx. 200 hPa rel. to 1000 hPa rel.) to the
sample gas outlet with appropriate measurement resolution (0.1 hPa). Absolute pressure
gauges with correspondingly good resolution are also suitable.
2. Connect the sample gas inlet to a compressed air source via a shutoff mechanism. The
shutoff mechanism must demonstrate a leakage rate < 10
3. Pressurize the analyzer module carefully with compressed air until the pressure gauge
reaches approx. 200 hPa.
4. Close the shutoff mechanism and wait about 5 minutes until any existing temperature
compensation processes are completed.
5. Note the displayed pressure value. Wait an additional 5 minutes and note the pressure
again.
6. Calculate the difference between the two pressures.
If the determined pressure difference is < 5 hPa, the sample gas path is adequately tight.
86
hPa*l/s.
-5
Compact Operating Instructions, 06/2017, A5E31805656-05
Quick Start