Additel 938 User Manual

Warningsand cautions

Operate the pump in the rated pressure range of 15,000 psi (1,000 bar)

and do not exceed the safety pressure of 18,000 psi (1,200 bar).

When the ystem ressure s reater han 10,000 psi you must close the

pre ressurization hut ff alve 7 and then pressurize he system with

sp igt ,

-p s o v （# ） t

the high pressure handle.

Close all valves and handles and tighten the ports when transporting the pump.

Always keep the reservoir cover vent valve #4 open during operation.

）（

Do not over tighten the valves, connectors and handles to avoid damage.

Change media immediately if it is contaminated.

Keep media level between 1/4 and 3/4 of the liquid reservoir filled.

Keep the threads clean and lubricious, and remove any dirt on threads.

Used by trained personnel only.

Additel is not liable for any safety problems or damages caused by misuse

or incorrect operation.

Specification

936/937/938

Hydraulic High Pressure Test Pump User's Manual

[Version number:1407V02]

Views and Hydraulic Schematic

1- Vent valve
2- Over-flow reservoir
3- Quick connector
4- Reservoir cover vent valve
5- Reservoir
6- Liquid drain valve

7- Pre-pressure shut off valve

(Isol ates th e calib ration volume from the

pre-pressure side of the pump)

8- High-pressure and fine pressure

adjustment handle

9- Pre-pressure handle

1 32

6

4

5

9

7

8

Pressure range: 12.5 psi ( 0.85 bar ) vacuum to

15,000 psi ( 1000 bar ) positive pressure

Remark：If local atmosphere pressure is 1 bar, the vacuum can reach to 0.85 bar;

If local atmosphere pressure is P, the vacuum can reach to bar.( P 85% )

Temperature:

（5 ~ 50）℃

Adjustment resolution: 0.015 psi ( 1 mbar )

Safety pressure: <18,000 psi (1,200 bar)

Pressure media:

ADT936: Diethylhexyl Sebacate
ADT938: Deionized water
ADT937 ：Oil,compatible to phosphoric acid ester fluid and Skydrol oil.

Size: Height: 10.43'' ( 265 mm )

Base: 20.71'' ( 526 mm ) x 9.65'' ( 245 mm )

Weight: 35.5 lb ( 16 kg )

Hydraulic Schematic

5

1

9

8

7

Troubleshooting

Problem

It is difficult to generate

pressure with the

pre-pressure

handle (#9)

It is difficult to

pressurize by turning

the high-pressure

handle (#8)

It is difficult to generate

high vacuum

Hard to pressurize
large-volume DUT

Pressure gauges do not

reach to zero

Hard to turn the

valves or handles

Cause

Vent (#1) is not closed

The O-ring in quick connector is missing, misplaced, or broken

Pre-pressure shut off valve (#7) is closed

Not enough media is in the reservoir.

Too much air is in the pump (see purge section of the manual)

Max pressure generation (could be as low as 5,000 psi, 350 bar) is
achieved with the pre-pressure handle (#9)

The pre-pressure shut off valve (#7) is not closed completely

Reference gauge or devices under test (DUTs) are not connected tightly

The O-ring in quick connector is missing, , or broken

The end surface of the DUT connection thread is not smooth

The connector of the DUT is not matched to quick connector

Purge the air from the system (see purge section of the manual)

#4 valve is not open

Because of the large volume of the DUT, it will take additional steps to
fill the volume to pressurize the DUT

#4 valve is not open

Too much force was previously applied

Hard to turn pre-pressure handle (#9) at high pressure

Lack of lubrication on threads

misplaced

Solution

Close vent valve (#1)

Replace with a new O-ring

Open pre-pressure shut off valve (#7). Caution: the pre-pressure side of the pump should not be exposed to
more than 10,000 psi (700 bar).

Fill more media, and keep media level between 1/4 and 3/4 of the liquid reservoir filled

Purge the air from the system (see purge section of the manual)

Close pre-pressure shut off valve and use high-pressure and handle (#8).

Close pre-pressurization shut off valve (#7)

Check finger-tight connectors, re-tight if necessary

Replace with a new O-ring

Use a PTFE washer in finger-tight connector

Use proper adapter

Purge the air from the system (see purge section of the manual)

Open the #4 valve

Step 1: Turn pre-pressure handle (#9) all the way in clockwise, close pre-pressure shut off valve (#7),

open vent valve (#1).
Step 2: Turn pre-pressure handle (#9) all the way counterclockwise, close vent valve (#1).
Step 3: Open pre-pressure shut off valve (#7), pressurize the system.
Step 4: Repeat step 1 to 3.

Open the #4 valve

Do not over tighten

This is normal. Close the pre-pressure shut off valve (#7) and use the high-pressure handle to adjust the
pressure.

Lubricate the threads

Maintenance

Fill media Drain and Clean

Note: In order to properly generate pressure,

the gas must be purged from the pump
(see purge process below).

①open reservoir
cover vent valve (#4)

Basic Operation

Note: Gauge positions are interchangeable. Any open ports should be plugged prior to operation.

DIGITALPRESSURECALIBRATOR

Units

bar

A

0255075100

A

②fill media

64 96

Pressure Gauge

Bar

32

128

160

SW V mA COM 24V

③ Open reservoir cover

vent valve (#4)

④ Unscrew with

hex wrench

⑤Remove the

reservoir(#5)

①Open drain valve (#6)

②Collect media using a container

Connection

SW V mA COM 24VSW V mA COM 24V

A

B

⑤ Vacuum displayed

on the gauge

DIGITALPRESSURECALIBRATOR

Units

b

bar

a
r

A

0255075100

③close

④Turn all the way out

Purge pocess

①Always keep valve(#4)

open during operation

B

②open

③open

④open

Purge process (cont.)

DIGITALPRESSURECALIBRATOR

Units

0255075100

If air is still trapped in the pump,
then repeat the purge process
2 or 3 more t imes un til all t he

b

bar

a
r

A

gas is re moved f rom the s ystem

④Wait for gauge to vent to zero

Bubbles

⑤Turn all the way in

Depressurizing process

DIGITALPRESSURECALIBRATOR

Units

b

bar

a

r

A

0255075100

③depressurizing

64 96

Pressure Gauge

Bar

32

①Always keep valve(#4)

open during operation

128

160

64 96

32

①depressurizing

DIGITALPRESSURECALIBRATOR

0 25 50 75 100

pressure transmitter

b

bar

a
r

A

Zeroing Pressurizing process

64 96

Pressure Gauge

Bar

32

128

160

①always keep valve(#4)

open during operation

dial gauge

C

pressure switch

Units

②open

②open

F G

DIGITALPRESSURECALIBRATOR

Units

①close

0255075100

②Vacuum

Pressure Gauge

Bar

128

160

②open

Vacuum process Vent

If it is difficult to generate vacuum
pressure, then repeat the purging
proce ss to mak e sure al l the gas
is remo ved fro m the sys tem

b

bar

a

r

A

0.6 0.4

Pressure Gauge

Bar

0.8

0.2

0

-1

64 96

Pressure GaugePressure Gauge

Bar

32

0.6 0.4

Pressure Gauge

Bar

0.8

-1

flexible hose

D

128

160

③open

0.2

0

①close

②open

DIGITALPRESSURECALIBRATOR

Units

b

bar

a

r

A

0255075100

②Pre-pressure

DIGITALPRESSURECALIBRATOR

Units

b

bar

a

r

A

0255075100

①back to atmosphere

E

Note: Skip step for dial gauge

64 96

Pressure GaugePressure Gauge

Bar

32

0.6 0.4

Pressure Gauge

0.8

-1

③

calibration in a narrow
pressure range.

128

160

64 96

Pressure GaugePressure Gauge

Bar

32

128

160

④high-pressure

Bar

0.2

0

0.6 0.4

Pressure Gauge

Bar

0.8

0.2

0

-1

③close

H

Remark:

A Additel has made a concerted effort to provide complete and current information for the proper use of the equipment. The product specifications and other information contained this manual are

subject to change without notice.

B:: Above pictures are just for reference.

Additel Corporation, USA

www.additel.com