ASHCROFT 28HPX High Purity Gauge Instruction Manual
- June 3, 2024
- ASHCROFT
Table of Contents
ASHCROFT 28HPX High Purity Gauge
INTRODUCTION
Pressure measurement is an important aspect of manufacturing.
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 semiconductor industry
while adhering to the following instructions 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 determined to be within
the 1-year warranty period and non-conforming in accordance with defects due
to design or manufacture by Ashcroft. Please note that the following instances
are excluded.
- Delivered products are disassembled, altered, parts replaced, or where any new function is added by the user or any third party.
- Directions described within the instruction manual or catalog have not been observed.
- Non-conformance is caused by deterioration due to use, natural disaster, fire or other force majeure events.
- Secondary damage caused by the non-conformance of the products including the above.
Regardless of recognized mishandling, any apparent evidence 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.
APPLICATION
This pressure gauge has an electropolished wetted surface 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 incorporates 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 installedwithin the same environment; this will provide an
alert to escaping gas that may adversely affect people and/or equipment
TRANSPORTATION, STORAGE, UNPACKING PRECAUTION
Transportation
Units should be handled the same as electronic or test measurement
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.
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.
Unpacking
Handle product with great care during unpacking.
Verify the product has not been damaged and that the instrument fulfills the
required specifications. Please contact the dealer or Ashcroft if an issue
exists.
DRAWING
Unpacking
Displacement occurs in the diaphragm once the pressure is applied via the
process connection. The pressure is then transmitted to the movement with the
pressure being indicated by the movement of the pointer.
INSTALLATION
-
Install the instrument where the environment is free from vibration, humidity, dust and high temperature.
-
The pressure gauge is packaged in a hermetically-sealed polyethylene bag. To avoid contamination, only remove the unit from the bag immediately before use/installation.
-
Take care not to damage the diaphragm surface.
WARNING
Scratches or scoring of the swivel coupling can result in leaking of the measuring device. This may prove hazardous, though this would depend upon the type of application being measured. -
Install the pressure gauge where it is held in a stable position.
-
Utilize a wrench to tighten the process connection coupling nut. Only apply a wrench to the coupling flats; no force should be applied to the gauge housing.
CAUTION
Do not apply force to the gauge housing as this can result in damage and adversely affect product performance. -
Reduce pressure pulsation to an absolute minimum.
OPERATION
-
Before applying pressure to the gauge, make sure that the pointer is positioned at “0” pressure.
-
Raise and lower pressure slowly, while avoiding sudden increase/decrease of pressure.
-
Never apply pressure in excess of the unit’s pressure rating.
-
Use the pressure gauge for measuring pressure less than ½ to 2⁄3 of the full-scale range.
WARNING
Never apply pressure beyond the maximum pressure (i.e., the full-scale value). Injury and/or damage may occur if pressure element ruptures due to extreme pressure in excess of its pressure rating. -
Measured fluids, gas or liquid, should be compatible and not corrosive to SUS316L.
WARNING
Do not use this pressure gauge with fluids that may corrode the instrument’s
wetted parts.
If corrosive fluid flows through this pressure gauge, the pressure element
(diaphragm) may be damaged or burst and it flows out, resulting in injury or
damages to the peripheral device and equipment.
MAINTENANCE
- Check the gauge accuracy regularly to ensure correct indication; this is recommended to be once or more per year.
- Pressure indication error of approximately 1 graduation is repairable, though units must be replaced when the error is identified as substantial.
TROUBLESHOOTING
Refer to the accompanying table and implement appropriate countermeasures. Contact Ashcroft in the event the issue persists.
- Refer to the accompanying table and implement countermeasures. Please contact Ashcroft in the event the issues persist.
The pointer does not move.| 1. Check if the pressure had been applied to the
pressure gauge.| 1. The pressure is zeroed.| 1. Apply pressure.
The pointer does not indicate pressure.| 1. Check whether the fluid and
ambient temperature are within the operating temperature range of the pressure
gauge.
2. Check whether excessive vibration exists.
3. Check whether excessive pressure fluctuations exist.
| 1. The operating temperature range has been exceeded.
2. Movement wears 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 been applied.
| 1. The diaphragm has been deformed due to excessive pressure.
2. Movement wears due to vibration or fluctuating pressure.
| 1. Use a higher pressure range.
2. Re-install pressure gauge in a different position.
The pointer indicates overpressure reading.| 1. Check whether excessive pressure had been applied.
2. Check whether the gauge was exposed to excessive vibration or if it was dropped/impacted.
| 1. Deformed sensing element due to excessive pressure.
2. Pointer shift or material deformation due to excessive pressure or impact.
| 1. Use a higher pressure range.
2. Be careful not to drop/impact 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_imRevA(I&M011-10276)_04-03-20
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