Dwyer HCHP - Manual (Page 2)

©Copyright 2011 Dwyer Instruments, Inc. Printed in U.S.A. 3/11 FR# R6-443632-00 Rev.1
MAINTENANCE
Upon final installation of the Series HCHP Hydraulic Calibration
Hand Pump, no routine maintenance is required. A periodic
check of system calibration is recommended. The Series HCHP
is not field serviceable and should be returned if repair is needed
(field repair should not be attempted and may void warranty). Be
sure to include a brief description of the problem plus any
relevant application notes. Contact customer service to receive
a return goods authorization number before shipping. GUIDELINES FOR USE:
• Do not exceed 10,000 psi (700 bar) as this is the pumps
maximum pressure.
• Each pump includes a built in pressure release valve to limit
the maximum pressure. This is factory pre-set to 10,000 psi.
• The HCHP pump has 3/8˝ and 1/4˝ BSP ports. In order to use
NPT fittings, the required NPT to BSP Parallel thread adapters
need to be installed (Included BSP to 1/4˝ NPT Parallel
Adapters).
• Do not use of thread sealant paste or tape on the adapters. To
seal the adapters, simply hand tighten and snug up with a
wrench. Do not over-tighten.
• Use with distilled water or mineral based hydraulic oil.
• Bonded washers are required to ensure proper seals.
PUMP OPERATION
1. Remove the filling plug and fill reservoir to the recommended
level with the appropriate fluid and replace plug.
2. Connect hose fittings and calibrators to adapters.
3. Connect master instrument to pump via the top port.
4. Connect instrument under test to flexible hose/gage adapter.
5. To prime the system, twist the knurled knob marked “release”.
Squeeze the handles together and release. Twist the knob
once again. Repeat as necessary until system is fully primed
and low pressure is indicated on either the master or test
instrument. This feature can be changed at any pressure.
6. Operate handle several times to build pressure. Please note,
once pressure starts to rise, pressure can increase very
rapidly. Warning: Do not exceed maximum operating
pressure indicated on the pump label.
7. Careful uses of the release valve and fine control enable a
controlled release of pressure, essential for calibration
purposes.
To adjust the pressure relief valve, release the pressure and turn
the valve counter clockwise 1/16 turn and then proceed to re-
pressurize. Repeat the process if further reduction is necessary.
8. RESERVOIR FLUID LEVEL: If the fluid level in the reservoir
falls considerably during use, a partial vacuum can be created
in the reservoir which may affect the pump performance. To
avoid this, simply allow air to enter the reservoir by partly
unscrewing the filling plug.
9. SEAL REPLACEMENT: Dependent on the frequency of use,
the Main Piston Seal (and others) will need replacing. Call
factory for replacement seal.
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
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