Dwyer TE-BCHP Low Pressure Hand Pump Installation Guide
- June 15, 2024
- Dwyer
Table of Contents
**Dwyer TE-BCHP Low Pressure Hand Pump Installation Guide
**
Series BCHP Low Pressure Hand Pump
Specifications – Installation and Operating Instructions
The Series BCHP Low Pressure Hand Pump is able to generate pressure and
vacuum for adjusting or calibrating pressure gauges, transmitters, or
switches.
The pump is hand operated and has a pneumatic pressure range of -28 in Hg to
870 psi
(-0.95 bar to 60 bar). Dual pressure ports allow two instruments to be
connected to
the pump without additional fittings. The Series BCHP can be used in
laboratories
and production areas. The fine adjustment valve on this pump ensures precise
measurements.
PRODUCT OVERVIEW
- Pressure connector for reference instrument 1/2˝ BSP female rotating
- Fine adjustment knob.
- Pressure relief knob.
- Change-over switch for pressure/ vacuum generation.
- Pressure connector for test instrument 1/4˝ BSP female rotating.
- Pump handle.
SPECIFICATIONS
Media : Air.
Output Ranges: -28 in Hg to 870 psi (-0.95 to 60 bar).
Process Connections: 1/4˝ female BSP.
Gauge Connection: 1/2˝ female BSP.
Materials: Anodized aluminum, brass, and ABS.
Weight: 8.4 lb (3.8 kg).
MOUNTING INSTRUCTIONS
The reference instrument is to be mounted on the top connection of the
pump.
Fastening with the knurled nut by hand is sufficient. An integral O-ring seals
the reference instrument pressure port without the use of teflon tape.
The test instrument is attached to the connection at the end of the hose.
The optional NPT adapter set includes sealing gaskets and different adapters
to best fit the instrument being tested. The tube can also be removed to
attach the test instrument directly to the pump using the same adapter.
NOTICE
Do not use tape sealant to seal the ports, as it may damage the pump.
PRESSURE OPERATION
Step 1 : Check whether the change-over switch (4) has pressure selected.
(See label on neck of the pump) If pressure is not selected, use a small tool
to push the switch to the correct position.
NOTICE
Do not move the change-over switch (4) when the test pump is
under operation.
Step 2 : Make sure the pressure relief knob (3) is not completely closed.
Step 3: Turn the fine adjustment knob (2) counter-clockwise until it
stops.
Then, turn the knob three turns clockwise to ensure the adjustment is adequate
to increase or decrease the pressure.
Step 4 : Turn the pressure relief valve (3) until it closes.
Step 5 : Press down on the pump handle (6) until the approximate pressure
level has been reached.
NOTICE Do not exceed a pressure of NOTICE 650 psi (45 bar)
Step 6: Turn the fine adjustment valve (2) clockwise to increase the
pressure or counter-clockwise to decrease the pressure.
Do this until the required pressure level has been reached on the reference
instrument.
NOTICE
After increasing the pressure, the reading may slightly drop for about 30
seconds, due to thermodynamic effects, the tube connection, and the sealing
gaskets. (If the pressure does not come to a standstill within that time,
check the ports to be sure they are sealed tightly.).
Step 7 : To reduce the pressure in the pump, turn the fine adjustment
valve (2) counterclockwise. If more pressure still needs to be decreased,
carefully turn the pressure relief knob (3).
NOTICE
Only remove the reference or test instrument when the relief valve (3) is
open and no pressure is in the test pump.
VACUUM OPERATION
Step 1 : Check whether the change-over switch (4) has vacuum selected.
(See label on the neck of the pump) If vacuum is not selected, use a small
tool to push it to the correct position.
NOTICE
Do not move the change-over switch (4) when the test pump is under
operation.
Step 2 : Make sure the pressure relief knob (3) is not completely closed.
Step 3 : Turn the fine adjustment knob (2) clockwise until it stops.
Rotate the knob counter clockwise three turns so that the vacuum pressure can
be increased or decreased.
Step 4: Turn the pressure relief knob (3) until it closes
Step 5 : Press down on the pump handle (6) until the approximate vacuum
level has been reached.
NOTICE Do not exceed a vacuum of -26.5 in Hg (-0.9 bar.)
Step 6 : Turn the fine adjustment valve (2) clockwise to decrease the
vacuum or
counter-clockwise to increase the vacuum.
Do this until the required pressure has been reached on the reference
instrument.
NOTICE
After increasing the vacuum, the reading may slightly increase for about 30
seconds, caused by thermodynamic effects, the tube connection, and the sealing
gaskets.
(If the vacuum does not come to a standstill within that time, check the ports
to be sure they are sealed tightly. )
Step 7 : To reduce the vacuum in the pump, turn the fine adjustment valve
(2) counterclockwise.
If additional vacuum pressure needs to be relieved, carefully open the
pressure relief valve (3).
NOTICE
Only remove the reference or test instrument when the relief valve (3) is
open and no vacuum is in the test pump.
FAULT INVESTIGATION
- If the pressure or vacuum cannot be generated correctly or if the set pressure and\vacuum does not stay stable, it may be caused by incorrect positioning or sealing of the gaskets. Be sure any adapters on the test instrument have been sufficiently tightened.
- Before assuming there is a leak in the pump, check if the pressure relief valve (3) is closed and if the change-over switch (4) is correctly positioned.
- Do not apply any force to the operating elements of the calibration test pump and do not connect an external pressure supply to the pump.
MAINTENANCE/REPAIR
Upon final installation of the Series BCHP, no routine maintenance is
required.
The Series BCHP is not field serviceable and should be returned if repair is
needed.
Field repair should not be attempted and may void warranty.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sales” in our catalog and on our website.
Contact customer service to receive a Return Goods Authorization number before
shipping the product back for repair.
Be sure to include a brief description of the problem plus any additional
application notes.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone : 219-879-8000
Fax: 219-872-9057
www.dwyer-inst.com
e-mail:
info@dwyermail.com