TB 9-4220-215-35
SECTION IV
DEPTH GAGES MOUNTED IN RECOMPRESSION CHAMBER
11. Preliminary Instructions
process. Personnel should become familiar with the entire bulletin before beginning the
calibration.
b. Items of equipment used in this procedure are referenced within the text by common
name as listed in table 1.
c. Unless otherwise specified, verify the result of each test and, whenever the test
requirement is not met, take corrective action before continuing with the calibration.
Adjustments required to calibrate the TI are included in this procedure. Additional
maintenance information is contained in the manufacturers' manuals for this TI.
d. Unless otherwise specified, all controls and control settings refer to the TI.
12. Equipment Setup
NOTE
Ensure that pneumatic pressure standard transducers have
been zeroed within the last 8 hours.
NOTE
Depth and pressure gages used with diving equipment are
exposed to the same oxygen or oxygen mixture as divers
breath; therefore, extreme care shall be taken not to
contaminate them during calibration. Diving equipment used
with oxygen or oxygen mixture shall be cleaned free of
flammable material. All equipment utilized in calibration of
diving equipment shall be visually inspected to ensure
cleanliness and adequacy of strength. No oil, grease, sealing
compound, dirt, etc., shall be allowed to enter the depth or
pressure gage. Metal parts can be cleaned with a double wash
with freon TF. Freon TF has a deteriorating effect on rubber;
therefore, do not wash rubber hose or items containing
rubber with freon TF. Rubber hoses can be washed with soap,
NSN 7930-00-282-9699, then rinsed with distilled water.
Allow all equipment to dry prior to making setup. Pipe thread
sealant (teflon tape), NSN 8030-00-889-3534, which is a part of
Secondary Transfer Calibration Standards Set AN/GSM-286,
can be used to seal potentially leaky conditions.
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