ASHCROFT 1130 and 1140 Differential Pressure Gauge/Switch Instruction Manual
- June 3, 2024
- ASHCROFT
Table of Contents
1130 and 1140 Differential Pressure Gauge/Switch
Instruction Manual
1130 and 1140 Differential Pressure Gauge/Switch
For proper operation of your gauge, please read all instructions carefully
before installing.
CAUTION: Do not exceed maximum operating pressure given on the gauge
label. Check fluid compatibility with wetted parts before use. Minor leakage
past the Teflon seal is possible. “High” and low media must be compatible.
LIABILITY
The liability of the manufacturer is null and void in case of damage caused by
incorrect use, failure to comply with manufacturer’s instructions, failure to
comply with local accident prevention safety laws and the handling by
untrained personnel.
OPERATING PRINCIPLE
High and Low pressures are separated by a sensor assembly consisting of a
magnet, diaphragm and a range spring. The difference in pressure causes the
sensor assembly to move in proportion to the change against a range spring.
A rotary magnet, located in a separate body compartment and isolated from the
acting pressures is rotated by a magnetic coupling following the linear
movement of the sensor assembly. A pointer attached to the rotary magnet
indicates differential pressure on the dial.
SWITCH: Reed switches (optional) are located adjacent to the pressure
chamber and are activated by the magnetic field of the sensor assembly.
Note: The gauges are calibrated to give ±2% full scale accuracy on ascending
readings.
INSTALLATION
For better performance the gauge should be mounted horizontally with the dial
vertical. Two mounting holes should be used for mounting (when applicable).
Select instrument location where it is not subjected to heavy vibration or
shock. Depressurize the system and connect the high and low pressure lines of
your system to the “High”
and “Low” ports of the gauge, respectively. It is recommended for tapered
threads to use thread sealant tape and for parallel threads it is recommended
to use “O” rings with male connectors to avoid excessive tightening and to
prevent leakage. The gauge is now ready for operation. Apply “High” and “Low”
pressures simultaneously, to avoid damage to the internal parts.
Models 1130 & 1140 consists of a piston type mechanism to sense the pressure
difference. It can withstand maximum operating pressure up to 3000 psi for all
ranges (6000 psi for stainless steel). If pressure exceeds the rated maximum
pressure, damage will occur to “O” rings used on male connectors, and the
Teflon seal inside the pressure chamber. If maximum operating pressure is
within the allowable limit of 3000 psi (6000 psi for stainless steel), but the
differential pressure exceeds gauge range, there will be no damage to the
gauge. The pointer will only go to the extreme right end of the scale and will
reset with a reduction in pressure.
PRECAUTIONS
Do not connect “High” and “Low” ports incorrectly. Do not subject the gauge
to excessive vibration. The gaugeis never to be used in an area where a
magnetic field is present as it may show the wrong readings.
As the gauge works on a magnetic coupling principle, use only non-magnetic
fittings, parts, etc. in areas closer than 2˝ on all sides, otherwise
calibration will be affected. Panel
mounted gauges should be installed in non-ferrous panel material. However,
gauges with 2˝ and 2.5˝ dials, mounted in steel panels, may require pointer
adjustment. This is done by the manufacturer, upon request.
Do not try to open any part of the gauge for any reason as calibration will be
affected.
SWITCH SETTING
Please follow these instructions when your differential pressure gauges are
supplied with a switch. The switches 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 screw is located on the plastic
cover. Rotate the screw counter clockwise to increase the setpoint and
clockwise to decrease the setpoint. One or two trials may be necessary to
attain the exact setpoint.
*Teflon TM of duPont
View from high pressure side
See datasheet at www.ashcroft.com for basic
dimensional details.
SPST SWITCH
Specifications
Contact Rating : 10 VA ac (rms) or dc (max)
Switching Current : 0.5 Amp ac (rms) or dc (max)
Switch Voltage : 100 Vac/Vdc (max)
ONE SPST SWITCH
Reed Switches and Terminal Strip Connection| TWO SPST SWITCHES
Reed Switches and Terminal Strip Connection
|
Reed Switches and DIN Plug Connection
View of socket for supply connections| Reed Switches and DIN Plug
Connection
View of socket for supply connections
|
View of plug after removing the socket| View of plug after removing the
socket
R = Red; B = Black; Y = Yellow; L = Live or + Supply; N = Neutral or – Supply.
SPDT SWITCH
Specifications
Contact Rating : 3 VA ac (rms) or dc (max)
Switching Current : 0.3 Amp ac (rms) or dc (max)
Switch Voltage : 30 Vac/Vdc (max)
ONE SPDT SWITCH
Reed Switches and Terminal Strip Connection| TWO SPDT SWITCHES
Reed Switches and Terminal Strip Connection
Reed Switches and DIN Plug Connection
View of socket for supply connections
View of plug after removing the socket
Body to be suitably grounded while using gauge + switch and only switch.
© Ashcroft Inc., 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.
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