Table 2. Minimum Specifications of Equipment Required

TB 9-4920-363-24

provide a four-to-one ratio between the standard and TI. Where the four-to-one ratio

cannot be met, the actual accuracy of the equipment selected is shown in parenthesis.

5. Accessories Required. The accessories required for this calibration are common

usage accessories, issued as indicated in paragraph 4 above, and are not listed in this

calibration procedure.

Table 2. Minimum Specifications of Equipment Required

Manufacturer and model

Common name

Minimum use specifications

(part number)

PNEUMATIC PRESSURE

Range: 0 to 120 inH2O

Druck, Model DPI145/R

STANDARD

Accuracy: ±0.1% of FS pressure

(MIS-45842)

Range: 0 to 24.5 psi

0.6 to 75.6 inHg abs

Accuracy: ±0.05 psi,

±0.033 inHg

CALIBRATION PROCESS

6. Preliminary Instructions

a. The instructions outlined in paragraphs 6 and 7 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 2.

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 manufacturer's manual for this TI.

d. Unless otherwise specified, all controls and control settings refer to the TI.

7. Equipment Setup

a. Place TI on a level platform or bench.

b. Remove protective cover from TI.

c. Position TI controls as listed in (1) through (5) below:

(1) VACUUM selector control valve to OFF.

(2) PRESSURE selector control valve to OFF.

(3) VACUUM and PRESSURE INCREASE and DECREASE control valves fully closed.

(4) POWER switch to OFF.