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 TB 55-1900-231-16
2.
Sensing Elements: The sensing elements are installed in close proximity to the humidistats and are
connected to digital Humidity/Temperature meter in the D/H envelope. The information is read on the meter
outside the D/H envelope. The meter has been precalibrated to furnish accurate information of the relative
humidity within the envelope; however, it maybe necessary, after the vessel is reprocessed, to recalibrate the
meter. The procedure manual for calibration of the meter is located in the Technical Manual package in the
crews berthing area.
3.
Activation/Reprocessing of the Humidistats and Sensing Elements: It is advisable to leave the sensing
elements in place during the cyclic activation/inspection phase; however, if it becomes necessary to
disconnect the machines the following procedure will be followed:
(a)
Secure power to the D/H machines and the sensing element recorder.
(b)
Remove the sensing element and humidistat and the cables from the area It is recommended that they
be coiled up as a unit tagged and stored in the supply cage.
CAUTION
Exercise caution when handling the sensing element and humidistats to
protect them from being damaged.
(c)
Reinstall the sensing elements and humidistats in the original location; keeping them well clear of
contact with metal objects.
NOTE
Figure E-1 and E-2 shows the physical location of the D/H machines and
sensing elements.
D.
D/H Readings. Once the barges are in dry storage on the Float on/Float off vessel and the dehumidification
equipment has been installed the dehumidification surveillance will be performed as herein specified.
1.
Set the humidistat to 40 percent.
(a)
The relative humidity (R/H) factor 40 percent (+ or = 5%) should be achieved within three (3) weeks
after the machines are in operation
(b)
Readings will be taken everyday for three (3) weeks. If the R/H factor is not achieved in the prescribed
time additional sealing may be required.
(c)
If after additional sealing is applied and the readings are still not within limits it may be necessary to
adjust or recalibrate the Humidity/Temperature Meter.
NOTE
The instruction manuals for the meter are located in the Technical
Manual Package.
2.
Verification of the relative humidity.
(a)
The actual relative humidity within the D/H zone will be verified at the end of three weeks and during
adjustment of the meter or humidistat by using a sling psychrometer (NSN 6685-00-826-1662) to
physically verify the relative humidity.
E-14
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