Name: Siemens SIPROCESS GA700
Brand: Siemens
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4.4.4 Reference gas monitoring

NOTICE

Damage to the micro󹪞ow sensor

The micro󹪞ow sensors can be damaged by aggressive sample gas components. As long as the

reference gas is 󹪞owing, the sample gas is prevented from di󹪜using to the micro󹪞ow sensors

and destroying them.

• Ensure that the micro󹪞ow sensors have no contact to the sample gas. To do this, monitor

the reference gas pressure using an internal (optional) or external pressure switch.

• Ensure that there is a continuous supply of reference gas during operation.

• Interrupt the sample gas supply if the reference gas pressure is too low, and 󹪞ush the sample

gas path with inert gas.

Note

Sample gas pressure increase in󹪞uences the sample gas pressure switch

At the time of delivery of an OXYMAT 7 analyzer module, the internal pressure switch for

reference gas monitoring is preset to approx. 2000 hPa (3000 hPa abs.). Changes in the sample

gas pressure in the analyzer module by more than 150 hPa require a change in the pressure

switch switching point by the same amount. The monitoring functionality of the reference gas

pressure switch is modi󹪝ed as a result.

• For changes to the sample gas pressure, contact the Service.

• Have the pressure switching point of the reference gas pressure switch adjusted by a Siemens

technician or someone trained for this case.

Siemens SIPROCESS GA700 Operating Instructions

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