560550-0110 Issue F Page 3 of 8
499207-0006 G1/8 bonded seal up to +200°C operation.
Dowty Ref: 300-020-0967-02
Refer to Dowty for external pressure ratings.
Mounting: Pressure Transducer is designed to be attached by the coupling thread only. Omni-
directional. To fit, use a 22.2 mm (7/8 inch) AF spanner on the hexagon provided and apply
maximum torque of 27 Nm (20 lbf-ft). The Customer must ensure that the pressure seal is
suitable for the application. If in doubt contact Gems Sensors.
Vibration: Where present, mount in a saddle clamp such as part number 499877-1000 (material:
Polypropylene) or 499877-1001 (material: Polyamide). Position the clamp as close to the
pressure port as practicable.
Effects of Heat: Avoid mounting the transducer near a source of heat which is liable to create a
temperature gradient across the instrument. If this is unavoidable, use a heat shield to deflect
uneven radiated heat or wrap the transducer in glass fibre insulation so that an even temperature
is assumed throughout.
High Temperature Pressure Measurement: Possible using a length of piping or a "syphon" to
isolate the instrument from the hot media. Since there is no flow, the temperature drop along the
tubing is considerable and usually a relatively short length is sufficient to bring the pressure
media temperature within acceptable limits for the instrument. Alternatively a temperature
isolator, part number 558564-0001, can be fitted (G¼ connection only). Pressure media must not
be allowed to solidify in the tube and/or pressure port.
ELECTRICAL INSTALLATION
All types include suppression devices providing transient protection to EN 613261-1 and
EN 613261-2-3.
For all types conformity with the requirements of the CE mark only applies when
connection is made with Gems Sensors approved cable, See APPROVED CABLE section,
and the screen of that cable is connected to a reliable earthing point at the instrumentation
end.
Types 40XXX-XX-M/P2-X: These types are capable of being immersed to a maximum depth of
200m WG.
Types 40XXX-XX-M2/PN-X: To combat the effects of lightning strike these types are fitted
with suppression devices providing surge immunity to IEC 801 Part 5. To protect the ‘receiving’
equipment it is recommended the end user fits a Lightning Protection Unit (LPU) at the
instrumentation end close to the point of cable entry into the building, installed as recommended
by the LPU manufacturer, to protect against the likely high current surge resulting from lightning
strikes.
