SADP_Operating_ Instructions_0114
9.0 Additional Information
9.1 Anti-Static Carrying Case
The carrying case supplied with the SADP is manufactured from anti-static material. The SADP unit can
be fully operated within the carrying case. It is recommended that the SADP is left in the carrying case
whenever in the hazardous area.
9.2 Desiccant and Head Seal
The sensor is kept dry when not in use by the desiccant contained in the head assembly. In the Model
SADP this is designed to maintain the sensor at about -75 C dewpoint, many years’ experience has
shown that this maintains the optimum responsiveness of the sensor.
The above readings should be obtained when the instrument has been left with the head in the closed
position for a few hours - e.g. overnight. As the desiccant only has to dry a very small volume of air or
gas after each test, and is completely isolated from the test gas and the room air, it has a life of
approximately 5 years in normal use. After very long service, or in case of accident the desiccant can
easily be replaced as follows:
1. Grasp the black plastic ring (Head Seal), which separates the inner and outer sections of the head
assembly, and unscrew it until it can be removed. Pull the inner section out of the outer section. In
the case the Head Seal requires Replacement slide the old seal off noting the orientation and place
the replacement on a firm bench upside down (threads uppermost. Now insert the head into the
seal, and when it meets the seal push firmly till it passes the seal.
2. Unscrew the plain brass base of the inner section, discard the old desiccant and replace with new.
3. Check that the rubber grommet is intact and in place in the base of the inner section and then re-
assemble the head assembly. Otherwise replace the grommet seal if necessary, applying a trace or
silicon grease and ensuring the seal is in place correctly and the sensor will travel up and down it
without displacement or contamination with silicon grease of the sensor filters
9.3 Batteries and Battery Check
When the battery check position is selected the reading should be in the green sector, or to the
right of it. If the reading is to the left of the green sector (drier), then the batteries should be
replaced.
The instrument is supplied with 6 Varta 2014 R14 batteries. In normal use these will last for one to two
years.
This instrument is only certified Intrinsically Safe to T6 with the use of Varta 2014 batteries as supplied.
The use of other batteries invalidates the certification of the equipment for use in hazardous areas.
To replace the batteries, first remove the instrument from its carrying case. The battery holders will be
found on the instrument back panel, and protected by a metal plate. Remove the plate by removing the
2 special screws with the key provided, take off the cap of each battery carrier, and replace the
batteries with 6 c-size (R14) cells. Always replace all 6 batteries at the same time, and do not leave
completely discharged batteries in the instrument. This must be carried out in the Safe Area.
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