iii.
Push the Hygrostick-Sleeve assembly into the pre-
drilled hole and twist firmly to seal as shown. Ideally,
leave the Hygrostick in the hole for 60 minutes before
taking a reading
iv.
Use the extension lead (supplied in the MMS pouch)
to connect the Hygrostick to the MMS instrument (having
previously removed the protective yellow Hygrostick cap,
if fitted)
v.
Select the Hygrometer Mode of operation (as detailed
in section 3 of the MMS instruction manual)
vi.
Measure the %rh in the hole; this is the ERH value of
the floor slab
2.2 Sub-surface ERH Test Procedure - using Protimeter Humidity
Sleeves
Protimeter Humidity Sleeves are convenient optional accessories for use with Protimeter
Hygrosticks. Clearance holes are drilled at the required POMs and the Humidity
Sleeves are inserted. As each Humidity Sleeve has its own sealing cap, it is not
necessary to plug or cover the drilled holes. Having placed the Humidity Sleeves in the
floor slab (ideally, 24-hours before ERH measurements are to be taken) remove the cap
and follow the procedure as given above from 2.1 ii.
2.3 Surface ERH Test Procedure - using Surface Humidity Box
If it is impractical or undesirable to take sub-surface ERH readings (the best technique
for determining the actual moisture condition of the slab) the Hygrostick can be used
in combination with a Humidity Box placed on the surface. Typically, Humidity Boxes
are used on floors with embedded heating pipe work, or when a contractor is working
to standards that specify surface ERH techniques (e.g. BS 8203:1996).
A Protimeter Humidity Box (Part No. BLD4711) is available as an optional accessory.
It should be used in accordance with applicable standard recommendations, or placed
at the POM for at least 24-hours prior to taking ERH readings.
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