Input Filter; Water Ingress Protection (Optional) - SARAD RTM 1688-2 Manual

Radon- and thoron-measurement equipment

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RTM 1688-2

Input Filter

The instrument is equipped with a high efficient multi-stage filter to prevent penetration of

daughter products into the measurement chamber. This filter will be protected against

contamination by an additional syringe filter fitted to the air inlet. Do not use the instrument

without that filter and replace it if required (becomes dark if loaded with dust). Take care for

the correct flow direction. Some filters can block the air flow completely when used in wrong

flow direction.

Please never measure radon in soil gases or in water samples without the stainless-steel

container connected to the water inlet protection! This prevents that water could enter into

the high-voltage chamber of the device. The penetration of water into the device can lead to

its failure and, as a result, to very expensive repairs!

SARAD GmbH offers to its customers a special stainless-steel container with floating contact

to prevent the penetration of water into the device when measuring radon in soil gases and

in water samples. For this purpose, a special stainless-steel container (see photo) is connected

to the air suction line of the radon measuring device between the soil air probe or water

sample and the measuring device and also connected with a plug. If water penetrates the

stainless-steel container, the pump and the air intake are automatically switched off, to

prevent the penetration of water into the high-voltage chamber and which results in a failure

of the device. To continue the measurement, pour out the water that has entered in the

stainless-steel container. The plug should be disconnected from the device and the stainless-

steel container should be removed for emptying.

In order to ensure the correct functioning of the water ingress protection system, the

stainless-steel container must be strictly in vertical position during the measurement!

If the device is used to measure radon in air, the supplied loose plug must be inserted instead

of connecting the special stainless-steel container. Otherwise the built-in pump would no

longer suck air.

fig 2: water ingress protection

 SARAD GmbH 2023

Manual_RTM1688-2_EN_24-02-2023.docx

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