TB 9-4931-228-24
Table 1. Calibration Description
Test instrument parameters
Performance specifications
Vacuum gage (Marsh, Type 2)
Range: 0 to 30 inHg
Accuracy: 2% of FS
Compound gage (Marsh, Type 3)
Range: 0 to 30 inHg vacuum
0 to 60 psi pressure
Accuracy: 2% of FS
Compound gage (multiple gage)
Range: 30 inHg vacuum to 150 psi
Schroeder Brothers Corporation, Model GS-5)
0 to 600 psi
0 to 5000 psi
Accuracy: 5% of FS on each range (gage)
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Sets AN/GSM-286; AN/GSM-287; or AN/GSM-705, and Secondary Reference
Calibration Standards Set NSN 4931-00-621-7878. Alternate items may be used by the
calibrating activity when the equipment listed in table 2 is not available. The items
selected must be verified to perform satisfactorily prior to use and must bear evidence of
current calibration. The equipment must meet or exceed the minimum use specifications
and TI. Where the four-to-one ratio cannot be met, the actual accuracy of the equipment
selected is shown in parenthesis.
paragraph 4 above and are used in this calibration procedure. When necessary, these items
may be substituted by equivalent items, unless specifically prohibited.
Table 2. Minimum Specifications of Equipment Required
Manufacturer and model
Common name
Minimum use specifications
(part number)
DIGITAL PRESSURE
Range: 0 to 60 psi
Druck, Model DPI-515
CONTROLLER
0 to 3000 psi
Accuracy: 0.3 psi
+1.8 psi
HYDRAULIC PRESSURE
Range: 0 to 10,000 psig
DHI, RPM3D-A10000 (13534030)
STANDARD
Accuracy: +1.875% psi
Table 3. Accessories Required
Common name
Description (part number)
HYDRAULIC COMPARATOR
King Nutronics, Model 3712-4-3 (13534038)
LOW-PRESSURE PNEUMATIC HOSE
48" Low-pressure metal flexible hose 1/2" tube ends
(SS-FL8-TA8TA8-48)
MANIFOLD BRACKET
(13643327)
PNEUMATIC HOSE
36" Braided hose assembly with green quick connect
stem (FRANK-QCHOSE-9)
MANIFOLD, AIR LINE
(13608989)
VACUUM PUMP, RECIPROCATING
SH01001UNIV