Dwyer Instruments CHP Series Installation And Operating Instructions Manual

Bulletin TE-CHP

Series CHP Pneumatic Hand Pump

Specifications - Installation and Operating Instructions

11-19/32

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WHEN PUMP EXTENDED

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[38.1]

8-21/32

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WHEN PUMP EXTENDED

1/8 NPT PORT

PRESSURE VENTING

The Series CHP Pneumatic Hand Pump is the most
dependable and rugged pump for applications up to 100
psi or 28.8˝ Hg Vacuum. The durable Acetel plastic and
anodized aluminum construction prevents body heat
transfer, resulting in drift-free, accurate readings. The Series
CHP is equipped with oversized check valves in order to
provide smooth and controlled operation. Dual O-Rings on
all pistons ensure the pump to be leak-free. The unit
includes a 2 foot long hose, 1/8˝ female NPT gauge fitting,
and 1/8˝ NPT pipe plug. An optional hose kit is available so
that a tee is not required when connecting a sensor and a
calibrator. The Series CHP is ideal for checking calibration
of pressure or vacuum gauges, switches, or transmitters.

CAUTION

INSURE ALL GAUGES AND INSTRUMENTS TO BE
CALIBRATED ARE DISCONNECTED FROM PROCESS
PRESSURES BEFORE CONNECTING PUMP. THE
MAXIMUM PUMP DESIGN PRESSURE IS 150 PSIG.
CONNECTION TO A PRESSURE SOURCE GREATER
THAN 150 PSIG COULD CAUSE SERIOUS INJURY.

1/8 NPT

VALVE CAP

PIPE PLUG

SHOWN WITH CHIP-KIT INSTALLED

SPECIFICATIONS
Output Range: CHP-P: 0 to 100 psi; CHP-V:0 to -28.8˝

Hg.
Process Connection: Two 1/8˝ female NPT parts, one
with a removable plug.

Materials: Acetel plastic and anodized aluminum.
Pressure Limit: 150 psig.
Temperature Limit: Not to exceed 150°F.
Displaced Volume: Approximately 4 in3.
Dimensions: 9˝ length x 1.5˝ diameter.
Weight: 1.5 lb (680 g).

OPERATION

Pressure Venting Valve Cap:
The small, knurled pressure relief knob relieves pressure
from the pump. Turning the knob counterclockwise allows
the system to vent in increments as small as 0.01˝ of H2O.
Do not over tighten the valve. See Figure 1.

1/4 NPT

GAGE FITTING

Figure 1

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

Variable Volume Chamber:

By holding the pump housing and turning the vernier knob,
the pump can be adjusted to accurate pressure or vacuum
settings. For extremely low pressure calibrations, turn the
vernier knob almost all the way in. The pump can be
adjusted in ranges less than 1˝ H2O.

NOTE: There are two warning rings on the vernier
knob column. The first is a warning and the second is
that you have gone too far. In either event, no loose
parts will fall out.

Pump Housing:

There are two 1/8˝ female NPT ports on the pump housing.
A pressure gauge can be attached to the 1/8˝ NPT port
directly or using the included 2 foot hose and 1/8˝ NPT
fitting. The other port can be plugged or a second gauge
can be connected using the CHP-KIT.

Fittings:

Series CHP Pneumatic Hand Pumps have unique fittings
and tubing. To reattach tubing to any fitting, heat the tubing
end with a heat gun or boiling water to soften it. With a
twisting action, connect the tubing to the fitting.

MAINTENANCE

Upon final installation of the Series CHP Pneumatic Hand
Pump, no routine maintenance is required. A periodic check
of system calibration is recommended. The Series CHP 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.

INSTALLATION

Pump Handle Assembly & Pump Piston:
To switch operation of the pump or pump piston between
vacuum and pressure, refer to Figure 2, “PUMP HANDLE
ASSEMBLY.”

PUMP CLEANING

Once the pump is disassembled, use a clean cotton cloth or
paper towel with Isopropyl Alcohol to clean off any
remaining lubricant residue. If process fluids have
contaminated the pump, please call technical support for
instructions.

Figure 2

©Copyright 2007 Dwyer Instruments, Inc. Printed in U.S.A. 12/07 FR# R6-443599-00

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

Phone: [phone] www.dwyer-inst.com