6.2. MAINTENANCE METHODS

6.2.1Interior and exterior cleaning

The cabinet interior and exterior should be kept clean and free from deposits.

The exterior surface is easily cleaned with warm soapy water. When cleaning any stainless steel surface do not use any cleaning agent containing chloride or hypochlorite ions as these will cause corrosion.

6.2.2Cleaning of cabinet drain(s)

Either one or two drains are situated centrally in the base of the treatment chamber. Access to the treatment chamber involves the removal of the working chamber base. Remove the front cover and slide out the working chamber base. Any accumulation of contaminants from the test sample can cause the treatment chamber to block. The drain should be checked regularly to ensure that particles are not collecting around it.

6.2.3Inspection and replacement of the wet wick(s)

Access to the sensors and wicks is through the sliding panel in the right hand wall of the working chamber. See fig. 4 for the position of the wet and dry bulb sensors.

The accuracy of all wet and dry bulb systems for the control of relative humidity is totally dependent on the wet wick. The rate of evaporation from the wick determines the cooling of the sensor and hence the temperature differential (wet bulb depression) of the control or recording instrument. Adherence to the following notes is recommended for all serious work at controlled relative humidities.

a)Wick must be clean - handle with care and clean hands - store in a clean place - change regularly (once a month).

b)Wick must cover the entire exposed length of the sensor ie: extend well beyond the sensitive tip and fit tightly to the sensor.

c)Wick must be the correct length to fit over the sensor and well down into the rubber wick reservoir, to prevent the high speed, necessary for correct evaporation, from blowing the wick out of the reservoir.

d)If wicking quality of the material is suspect, test by cutting off 1 cm of dry material and dropping into a cup of distilled water. Sample should wet and sink within 2 seconds.

Often wicking quality can be restored by boiling for a few minutes in clean distilled . water.

Figure 4.

RECORDER

CONTROLLER

DRYRT

WETRT

WETRT

DRYRT

 

/white\

/white

 

Temperature sensor positions (as viewed from inside working chamber)

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Sanyo 550 instruction manual Maintenance Methods, Interior and exterior cleaning, Cleaning of cabinet drains
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550 specifications

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