Installation and Maintenance Instructions
for 50 mm HPS High Purity Gauge
© Ashcroft Inc. 2022, 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. 50_HPS_Gauge_I&M008-10305_RevA_02-10-22
2
4. INSTALLATION
4.1
Install the instrument where the environment is free from
vibration, humidity, dust and high temperature.
4.2
The pressure gauges (Grade A) are packaged in a hermet-
ically-sealed polyethylene bag. To avoid contamination,
unpack the bag immediately before using the instrument.
4.3
Direct connection pressure gauges, directly screwed to the
piping, should always be supported.
4.4
Install the pressure gauge so that the dial reading is vertical.
CAUTION
An error is an accuracy that will result in the event the
pressure gauge is not installed in a vertical position.
4.5
In liquid measurement, the pressure head difference
between the pressure outlet port and pressure gauge has a
negative effect upon the accuracy.
CAUTION
If a pressure gauge with a range of 0 to 0.1 mPa is
installed one meter higher than the pressure outlet port,
the instrument reading will reflect a lower than actual
pressure. This error corresponds to 10% of the span. On
the contrary, if a pressure gauge is one meter lower than
the pressure outlet port, the unit will register a value that is
10% higher than the actual gauge.
In the event the installation point is known, the point-
er may be adjusted higher or lower to coincide with the
estimated error. A pressure gauge with a zero adjustment
pointer can be re-zeroed after it has been installed.
4.6
Reduce pressure pulsation to an absolute minimum.
4.7
When installing the instrument, be sure to apply a wrench
to the flats of the gauge’s pressure connection and rotate
clockwise. Do not apply force to the enclosure as this will
cause the dial to move and result in the zero-point shift.
CAUTION
Do not apply force to the enclosure as this will cause dam-
age and adversely affect product performance.
4.8
Take precautions to ensure the unit is not exposed to tem-
peratures where process media is liable to freeze.
4.9
It is recommended that a siphon or length of pipe be utilized
when high-temperature fluids are being measured.
4.10
Take precautions on the use of
9
⁄
16
-18UNF (Connection thread)
1
Take care not to damage the seat surface.
WARNING
Scratches or scoring can result in the measuring device to
leak. This may prove hazardous, though this would depend
upon the type of application being measured.
2
Do not use previously removed packing and filter packing.
Replace with new parts whenever they are disassembled.
SWITCH SETTING
:
Please follow these instructions, the switch are normally
factory set to save time the customer time. However, they
are field adjustable.
CAUTION:
Supply voltage should not exceed switch rating. For higher
supply, adding a relay is recommended.
SWITCH ADJUSTMENT:
The following procedure must be done by putting the
gauge on a test bench or while in actual service. The
switch adjustment along the inner case. Remove threaded
window and mover orange pointer by hand to desired
pressure. One or two trials may be necessary to attain the
exact setpoint.
5. OPERATION
5.1
Make sure that the pointer is at the ‘0’ position prior to
applying pressure to the gauge.
5.2
Raise and lower pressure slowly, while avoiding sudden
increase/decrease of pressure.
5.3
Never apply pressure in excess of the unit’s pressure rating.
5.4
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.
5.5
Measured fluids, gas or liquid, should be compatible and not
corrosive to SUS316L.
