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
2
3-3
Unpacking
Handle product with great care during unpacking.
Verify the product has not been damaged and that the
instrument fulfills the required specifications. Please con-
tact the dealer or Ashcroft if an issue exists.
4. DRAWING
4.1 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 indi-
cated by the movement of the pointer.
5. INSTALLATION
5.1
Install the instrument where the environment is free from
vibration, humidity, dust and high temperature.
5.2
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.
5.3
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 hazard-
ous, though this would depend upon the type of applica-
tion being measured.
5-4
Install the pressure gauge where it is held in a stable
position.
5-5
Utilize a wrench to tighten the process connection cou-
pling 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.
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 pressure in excess of the unit’s pressure
rating.
6.4
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.
6.5
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.
7. MAINTENANCE
7.1
Check the gauge accuracy regularly to ensure correct
indication; this is recommended to be once or more per year.
7.2
Pressure indication error of approximately 1 graduation is
repairable, though units must be replaced when the error is
identified as substantial.
8. TROUBLESHOOTING
Refer to the accompanying table and implement appropriate
countermeasures. Contact Ashcroft in the event the issue
persists.
8.1
Refer to the accompanying table and implement
countermeasures. Please contact Ashcroft in the event the
issues persist.
Pointer
Connection
Socket
Diaphgram
Movement
Dial