Dwyer Instruments CHP Operating Manual

Series CHP Pneumatic Hand Pump

11-19/32

[

294.48]

WHEN PUMP EXTENDED

1/4 NPT

G

AGE FITTING

8-21/32

[219.87]

W

HEN PUMP EXTENDED

1

/8 NPT PORT

SHOWN WITH CHIP-KIT INSTAL LED

1

/8 NPT

PIPE PLUG

PRESSURE VENTING

V

ALVE CAP

ø1-1/2

[

38.1]

Specifications - Installation and Operating Instructions

ulletin TE-CHP

B

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.

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.

Figure 1

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]

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

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.

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.”

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.

Figure 2

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.

©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 4/14 FR# R7-443599-00 Rev. 1

DWYER INSTRUMENTS, INC.

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

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]