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Installation and Maintenance Instructions for           

28HPX High Purity Gauge

© Ashcroft Inc. 2020, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: 203-378-8281, Fax: 203-385-0357, www.ashcroft.com 

All sales subject to standard terms and conditions of sale. 28_HPX_Gauge_im_RevA_(I&M011-10276)_04-03-20

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Table of contents:

1. INTRODUCTION ................................................................. 1

2. APPLICATION ..................................................................... 1

3.  TRANSPORTATION, STORAGE, UNPACKING 

PRECAUTION ...................................................................1-2

4. DRAWING ............................................................................ 2

5. INSTALLATION .................................................................... 2

6. OPERATION ........................................................................ 2

7. MAINTENANCE ................................................................... 2

8. TROUBLESHOOTING ......................................................2-3

1.   INTRODUCTION

 

Pressure measurement is an important aspect of manufac-
turing. Advancement of equipment and plant engineering 
technology requires higher performance and more versatile 
instrument functions. 
The Ashcroft model 28HPX High-Purity pressure gauge is 
similar to an ordinary instrument, yet has been assembled 
under a significantly different process where treatment, 
control, and inspection are rigidly maintained. This manual 
describes the basic operation of this product for the semi-
conductor industry while adhering to the following instruc-
tions will ensure its proper and effective application. 

[Before Using Pressure Gauge]

 

It is highly recommended that this instruction manual be 
thoroughly reviewed to prevent improper instrument handling 
and/or implementation. Consult Ashcroft on related topics 
not covered within this document. 

[Warranty]

 

Instruments are repaired or replaced, at no cost, if deter-
mined to be within the 1-year warranty period and non-con-
forming in accordance with defects due to design or manu-
facture by Ashcroft. Please note that the following instances 
are excluded.

  1.  Delivered products are disassembled, altered, parts 

replaced, or where any new function is added by the user 
or any third party.

  2.  Directions described within the instruction manual or cata-

log have not been observed.

  3.  Non-conformance is caused by deterioration due to use, 

natural disaster, fire or other force majeure events.

  4.  Secondary damage caused by the non-conformance of 

the products including the above.

   Regardless of recognized mishandling, any apparent evi-

dence of deformation, abrasion, burnout, or other identified 
issue shall be excluded from the warranty scope with the 
cost being incurred by the customer. 

[Definition of Safety Terms]

 

Safety precautions within this manual have been classified 
as follows:

  

DANGER

 - Ignoring this warning may result in serious 

injury or death.

  

WARNING

 - Ignoring this warning may result in serious 

injury or death.

  

CAUTION

 - Ignoring this warning may result in the material 

damage and render instrument performance defective. 

2.   APPLICATION

 

This pressure gauge has an electropolished wetted sur-
face for measuring materially-compatible gas pressure (EP 
grade). The pressure gauge is fabricated in accordance with 
high cleanliness and tightly sealed standards. Consequently, 
the model 28HPX High-Purity pressure gauge is ideally 
suited for pressure measurement within the semiconductor 
production process, etc.  
The product footprint design is ultra-compact and incor-
porates a 1.125˝ surface mount. The pressure element is a 
diaphragm which facilitates easy maintenance for cleaning 
and gas flushing. 
 
The instrument’s pressure element is a thin wall diaphragm. 
Do not use the pressure gauge with the wetted material 
exposed to any corrosive gas or atmosphere. Additionally, 
it is industry practice for the gas detector’s to be installed 
within the same environment; this will provide an alert to 
escaping gas that may adversely affect people and/or 
equipment

3.  TRANSPORTATION, STORAGE, UNPACKING PRECAUTION 

 3.1  Transportation 

Units should be handled the same as electronic or test mea-
surement instruments. Be very careful not to apply vibration 
to the pressure gauge during transportation. 
Never hit or drop the pressure gauge.

 

CAUTION

The instrument may incur damage if dropped/impacted.

   3.2 Storage 

Store in a temperature-controlled environment free from 
dust, humidity, and vibration. Prevent temperature variances 
as this may result in condensation developing in the product.

28HPX High Purity Gauges

Summary of Contents for 28HPX

Page 1: ...ents 4 Secondary damage caused by the non conformance of the products including the above Regardless of recognized mishandling any apparent evi dence of deformation abrasion burnout or other identified issue shall be excluded from the warranty scope with the cost being incurred by the customer Definition of Safety Terms Safety precautions within this manual have been classified as follows DANGER I...

Page 2: ...uge housing CAUTION Do not apply force to the gauge housing as this can result in damage and adversely affect product performance 5 6 Reduce pressure pulsation to an absolute minimum 6 OPERATION 6 1 Before applying pressure to the gauge make sure that the pointer is positioned at 0 pressure 6 2 Raise and lower pressure slowly while avoiding sudden increase decrease of pressure 6 3 Never apply pres...

Page 3: ...ears due to vibration 3 Movement wears due to pressure fluctuations 1 Re install pressure gauge in a different position 2 Re install pressure gauge in a different position 3 Reduce pressure fluctuations The pointer does not read zero when the pressure gauge is removed from the piping 1 Check whether excessive pressure had been applied 2 Check whether excessive vibration or fluctuating pressure had...

Page 4: ... 28HPX High Purity Gauge Ashcroft Inc 2020 250 East Main Street Stratford CT 06614 5145 USA Tel 203 378 8281 Fax 203 385 0357 www ashcroft com All sales subject to standard terms and conditions of sale 28_HPX_Gauge_im_RevA_ I M011 10276 _04 03 20 4 ...

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