SECTION IV CALIBRATION PROCESS FOR DEPTH GAGES MOUNTED IN RECOMPRESSION CHAMBER

TB 9-4220-215-35

SECTION IV

CALIBRATION PROCESS FOR

DEPTH GAGES MOUNTED IN RECOMPRESSION CHAMBER

11. Preliminary Instructions

a. The instructions outlined in paragraphs 11 and 12 are preparatory to the calibration

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.