2
C OPERATING LIMITATIONS
Our Warranty of the Differential Pressure Unit will not apply if the following limitations are exceeded :
T
EMPERATURE
(–) 60° F. to + 200° F
PRESSURE
Units are capable of line pressures up to the MWP ( printed on the dial ) without damage or permanent change in
calibration.
P
ULSATION
Rapid pressurisation can cause severe damage to the sensing element. Rapid pressure change (either increase or
decrease ) can be described as a change in pressure occurring fast enough to drive an instrument in less than a second.
If the DPI gauge is to be subjected to pulsation, make sure the externally adjustable pulsation dampener (Snubber) is
adjusted correctly to prevent damage to the instrument. All instruments are shipped with the Snubber trimm ¼ turn
open. Use a screwdriver to adjust this trimm until the proper dampening effect is obtained. Approximately 1½ turns
is fully open. The Snubbers are provided at both ports. Severe pulsation will affect the accuracy of the instrument
VIBRATION AND SHOCK
Do not subject instrument to severe mechanical vibration or hydraulic shock, unless the unit has been specially
ordered for such severe operating conditions.
D INCOMING INSPECTION
UNPACKING
Check for shipping damage to cartons and contents. Check contents against shipping order, contents should include
(1) Material itemised on order and
(2) Installation instruction.
IMPORTANT : When called for on order, the gauge is pre-cleaned for special application and sealed in a clear
plastic bag. Check for special installation instructions before breaking the seal on the sealed bag.
E LOCATION
! Locate the gauge such that it is easily accessible from ground level.
! Select a reasonably vibration-free location where ambient temperature does not exceed operating temperature
limits.
! Do not locate the instrument near vents or bleed holes discharging corrosive vapors or gases.
! In Liquid Measurement locate the gauge below the primary element to permit entrapped air or gas to be vented
into the flow line.
! For Steam and Gas Measurement place the gauge above the flow line to facilitate condensate draining.
! The distance between the primary device and the gauge shall be as short as possible. For distances up to 50 feet
use 1/4" or 3/8" pipe or tubing. For runs 50 to 100 feet use 1/2" pipe or tubing. Distances exceeding 100 feet are
not recommended. The recommended distance limitation does not apply if an air-purge system is used.
G MOUNTING
The Instrument is adapted for mounting as :
(a) Panel Mounting
(b) Pipe Mounting for 2" Pipe on stanchion or Wall.
The instrument is supplied with a mounting bracket suitable for both wall & 2" Pipe mounting.
The instrument must be approximately level for proper operation.
Since Switching Type Instruments work on very sensitive optical sensing it is recommended that the instrument is
mounted such that direct sunlight or direct light source do not impinge on the front of dial. Preferable to provide
a canopy.
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