ASHCROFT 1490 Low Pressure Diaphragm Gauge Instruction Manual
- June 3, 2024
- ASHCROFT
Table of Contents
ASHCROFT 1490 Low Pressure Diaphragm Gauge
Instruction
WARNING: To prevent misapplication, pressure gauges should be selected
considering media and ambient operating conditions. Improper application can
be detrimental to the gauge and can cause failure and possible injury or
property damage. Users should become familiar with the ASME B40.100 before
specifying pressure measuring instruments.
(This document can be obtained from ASME Int’l, Three Park Ave., NY,NY
10016-5990 or at ASME.org).
The Ashcroft 2½” and 3½” 1490 low pressure diaphragm gauge is designed for use
whenever the pressure medium is air or a gas that is not corrosive to
beryllium copper, brass, polysulfone and RTV silicone.
Range: The range of the gauge should be approximately twice the maximum
operating pressure. (Proof pressure is 150% of range, Burst pressure is 50 psi
on ranges up to 5# and 100 psi on ranges greater than 5#.)
- Temperature: Operating temperature shall fall within –20°-150°F.
- Installation: Whenever possible, gauges shall be located to minimize effects of vibration, moisture and extreme temperatures.
Torque should never be applied to the gauge case. Instead, a wrench should
always be used on the flats of the gauge socket to tighten into the fitting or
pipe. For natural gas applications it is recommended that a 0.013 throttle
plug is installed in the socket. Throttle plug is not available with hose barb
or female thread connections.
U-clamp mounting must be ordered at time of order placement for lower NPT
process connections. (Cannot be field installed.)
Accuracy: ±2-1-2% of Span ASME Grade A. Zero adjustment, recalibration screw
located at 6:00 on dial. If necessary, remove polycarbonate quarter turn
window and adjust with a screwdriver.