Ashcroft 1327D - Pressure Gauge Comparator - Manual (Page 6)

Pressure values produced by the pump are able to be
clearly read to within ±0.25% accuracy of the span of the
precision test gauge selected for testing. Certification of
test gauge accuracy traceable to the N.I.S.T., is available
upon request. A hand jack set, three wrenches, spare O-
rings, and special adapter for making connections to pres-
sure outlets that do not accommodate cone pipe seating,
are included with each unit.
Test pump accessories include lower and back connection
offset pipe assemblies, with pipe adapters for
1 ⁄
4
and 1 ⁄
2
NPT connections.
An all metal, double-latched, top handle carrying case is
supplied with the complete tester to hold all fittings and
attachments.
2.2.2 Theory of Operation – 1327D
The operating principle behind the 1327D Test Pump is a
simple form of comparison. Pressure produced by the
pump is equally distributed by the manifold to a test gauge
and to a device being calibrated or checked. The reading
of the test gauge serves as the reference to which other
device readings are compared against.
Selection of the test gauge range is the determining factor
in establishing the precision to which a comparison check
is to be made. Test gauge accuracy is expressed as a per-
centage of its span.
Proper selection of the test gauge range must be made to
minimize the amount of the unit error. If a 5,000 psi
(35,000kPa) range test gauge were used to test devices
whose span values were less than a fourth of the test
gauge range, the unit error of 12.5 psi (87kPa) would be
greater than 1% of the test pressure. Therefore, it is impor-
tant to select a test gauge that has a full scale range equal
to or only slightly in excess of the pressure value to be
measured.
2.2.3 Specifications – 1327D
Accuracy:
1 ⁄
4
% of 1% of test gauge span.
Test Gauges: Ashcroft solid front type 45-1082-02L-XAZ,
4
1 ⁄
2
˝ dial size (120mm case). Bourdon tube materials for
1327D and DH are bronze and Monel. Bourdon tube
materials for 1327DO are bronze and Monel.
Pump: Two stage, lever operated generates 10,000 psi
(70,000kPa) with 28 pounds (12.7kg) of force on lever
handle.
Pump Body: Aluminum, corrosion inhibited and coated
with baked blue epoxy finish.
Shuttle Valve: Stainless steel bypass valve that controls
rate of pressure increase and reduces operator effort
when working at high pressure.
Displacement Valve: A fine pitched threaded valve road
permitting vernier adjustments to fluid volume to provide
precise changes. Limit stops prevent road removal during
normal operation.
Mounting: Four bench mounting holes located in base for
positive mounting to any level surface.
Instrument Connections: Two coned pipe assemblies
provide vertical calibration capability for back and lower
connected gauges. Standard
1 ⁄
4
inch internal NPT and 1 ⁄
2
inch internal NPT fitting adapters are supplied.
Operating Fluid: 1327D – Light grade machine oils, auto-
motive petroleum base SAE 20 oils or other equivalent flu-
ids suitable for use with Buna N O-ring materials. 1.5 pints
required (.7 liters).
1327DH – Most hydraulic oils of phosphate ester base,
brake fluids, skydrol, pydraul etc., suitable for use with
Butyl or Ethylene-Propylene O-ring materials. 1.5 pints
required (.7 liters).
1327DO – Distilled water with compatible corrosion
inhibitor. A .1% solution of sodium dichromate is a suitable
inhibitor. 1.5 pints required (.7 liters).
2.2.4 Certification:
Standard – Master gauges are calibrated on NIST trace-
able standards, no certification documentation provided.
Optional (CD-4) – Individual certified calibration chart
(NIST traceable) for each master gauge.
3.0 SETTING UP THE TESTER
3.1 Inspection
3.1.1 Component Check 1305D
The deadweight tester, as shipped from the factory, con-
tains all of the components necessary for operation except
pump fluid. Depending upon the model and pressure
range selected, the total number of weights, weight boxes
and piston and cylinder assemblies will vary. Refer to
Specifications, Section 2.1, Table 2-1 for model clarifica-
tion.
3.1.2 Component Check 1327D
The portable test pump, as shipped from the factory, con-
tains all of the components necessary for operation except
pump fluid. Depending upon the model and pressure
range selected, the total number and their ranges will vary.
Refer to Specifications , Section 2.2, Table 2-3 for model
clarification.
3.1.3 Claim for Missing or Damaged Goods
In the event it is determined that an item is missing or
damaged, contact Customer Service immediately at the
address indicated in Section 1.0. Damaged merchandise
and the packaging materials must be held for inspection
by authorized Ashcroft Inc. personnel or the responsible
carrier. Disposition of damaged or missing goods will be
determined after inspection has been performed on loca-
tion, or at the discretion of the manufacturer, at the factory.
Inspection may be waived if circumstances, as judged by
the manufacturer, preclude its necessity.
3.2 Installation Type 1305D
3.2.1 Set-up Procedure (See Figure 2-1)
To remove the tester from the case, release the spring clip,
depressing the clip by hand, grasp the pump reservoir and
lift up the back end of the pump assembly.
Having removed the pump assembly from its carrying
case, remove the two plastic shipping plugs.
Select a lower connection (64) or back connection (66) off-
set pipe and connect to inner pump body outlet as shown
in Fig. 2-1.
Remove the reservoir filler plug (35) and fill reservoir with
operating fluid.
3.2.2 Bench Space Required (See Figure 1-1)
Allow a space:
10 inches (25.4 cm) width
27 inches (68.6 cm) depth
22 inches (55.9 cm) height – allows for maximum load of
deadweights
3.2.3 Storage Space Required
One Tester Box:
10
1 ⁄
2
inch (2.6 cm); 22 1 ⁄
2
inch (57 cm) depth; 10 inch (25
cm) height