Dwyer PCHP User Manual

Series PCHP Pneumatic Calibration Hand Pump

1

/4 BSP WITH

1

/4 NPT ADAPTER

1

/8 BSP WITH

1

/8 NPT

A

DAPTER

1/8 NPT
PLUG

SLIDE
BUTTON

1

-1/8

(

28.58)

3-11/64
(80.57)

8-41/64

(219.48)

7-3/32

(180.18)

5

(

127)

TOP PORT

VERNIER KNOB

SIDE PORT

PRESSURE/

VACUUM

SWITCH

VENT KNOB

KNOB GRIP

HANDLE
CUSHION

SPRING

COVER

SPRING
TENSION
ADJUSTER

Specifications - Installation and Operating Instructions

Bulletin TE-PCHP

The Series PCHP Pneumatic Hand Pump comfortably sources pressure

and vacuum to check calibration of gages, switches, transmitters, and
recorders. The contoured cushion handles provide extra comfort while
preventing the pump from sliding. The oversized check valve provides
smooth operation throughout the output range. The dual o-rings on all pis­tons ensure zero leakage.

SPECIFICATIONS
Media: Air and compatible gases only.
Output Ranges: -28˝ Hg to 600 psi (-0.945 to 40 bar).
Process Connection: 1/4˝ NPT/BSP.
Gauge Connection: 1/8˝ NPT/BSP.
Materials: Stainless steel fittings, anodized aluminum housing,

plastic/rubber handles, and nitrile o-rings.

OPERATION

Weight: 2 lbs (0.91 kg).

Volume Control

The pump is equipped with two knobs for fine adjustment of the system
pressure. The vent knob can be used to slowly reduce the system
pressure. The vent knob should be closed prior to pressurizing the
system by turning the knob away from the pump housing. The Vernier
knob can be used to increase or decrease the system at a more
controlled rate. For fast relieve of the pressure, move the
pressure/vacuum pin to the opposite direction.

Over Pressure Protection

For a maximum pressure of 600 psi, the handles should be 3/4˝ apart at
the closest point. To reduce the maximum pressure, adjust the spring
tension via the hex nut at the bottom of the main shaft between the
handles. The closer the handles are to each other, the lower the amount

Fig. 1

Insure all gauges and instruments to be calibrated are dis­connected from process pressures before connecting the
pump. The maximum pump design pressure is 600 psig.
Connection to a pressure sources greater than 600 psig could
cause serious injury.

of pressure that will be able to be generated.

Pressure/Vacuum Selector

The pump can be used to generate pressure or vacuum depending on
the position of the pin located in the pressure/vacuum switch. Press the
pin on the side of the pump housing according to labels for the desired
operation.

Fittings

The pump is equipped with 1/8˝ and 1/4˝ BSP ports. In order to use NPT
fittings, a NPT to BSP Parallel Thread Adapter is required. These
adapters, which are included with the pump, have a bonded washer
attached to the male end of the adapter.

CAUTION! Do not use thread sealant paste or tape to seal the
adapters to the pump. Do not over tighten adapters.

The pump uses a Schrader valve instead of a needle valve. Thus, full
open or closed is several turns from the end of the travel. Over­tightening does not increase the seal.

DWYER INSTRUMENTS, INC.

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

©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 4/14 FR# R7-443631-00 Rev.1

For High Pressure Operation

Prior to pressurizing, back out the Vernier knob until the ring on the
Vernier shaft is showing. Pump to pressurize. Turn the Vernier knob
towards the pump housing and the pressure should easily be able to
reach 600 psi.

MAINTENANCE

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

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