Ahlborn ALMEMO 2390-5 Manual de servicio descargar pdf (Pagina 10)

Thermoanemometer

Zero Point Correction:

Generally, a re-adjustment of the zero point is not required. However, during

long term operation or when exposed to heavy shocks during transportation

the zero point can slightly shift.

If the output signal is not equalling 0m/s when the sensor is covered, a zero

point correction should be performed.

1. The sensor must be closed. Wait at least 3min after closing.

2. For approximately 3 to 4 seconds short out pin 1 and pin 5 located at

the socket "LEMO (large)" and then disconnect them again.

3. The detector module is now in the adjustment mode and automatically per-

forms a zero point correction. After a waiting period of approximately 2

minutes the sensor is operational again.

It must be ensured that the ambient temperature remains stable

during the adjustment.

Fuse:

If no output signal is available despite the supply voltage being applied, the

power supply must be interrupted for at least 30 seconds. This allows the (pos-

sibly) triggered PTC fuse to regenerate again.

Cleaning:

Generally, the sensors are maintenance-free. However, the sedimentation of

contamination at the high temperature NTC can lead to errors of measure-

ment.

For cleaning purposes the head part can be thoroughly rinsed in a non-ag-

gressive cleansing solution. Afterwards rinse in distilled water and allow to

completely dry.

Attention!

Do NOT touch the tip of the sensor! NEVER dry the head part

using a hot-air blower or compressed air!

The sensitive measuring cells could be damaged.

3-5-10 ALMEMO

Sensors

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Ahlborn ALMEMO 2390-5 Manual de servicio Pagina 10