Setra System Model 542 - Manual (Page 4)

* In the event of fire the end user must ensure that the system pressure is vented to a safe
area.
* The effects of decomposition of unstable fluids should be considered by the user when
placing this device in service.
* The pressure transducer has no means of draining or venting, this must be performed by
another component in the end users system.
* Pressure range must be compatible with the maximum pressure being measured.
* Pressure media must be compatible with the transducer wetted parts which are:-
Ranges 1 and 1.6 bar, 15 and 30 psi : 15-7 Mo plus 17-4 PH stainless steels
Ranges 2.5 bar and 60 psi and above : 17-4 PH stainless steel
Pressure connection code B2 : Inconel alloy 625
Ranges 9000 and 10,000 psi: Inconel alloy 625
* Exposed end of cable must be kept free from moisture.
* Liquid must not be allowed to freeze in the pressure port.
MECHANICAL INSTALLATION
Pressure Connections : G¼ internal pressure connection as standard. Alternative fitted as specified
at time of order.
Pressure couplings screwed into G¼ pressure ports should have a maximum thread engagement ½”
(13mm) and UNDER NO CIRCUMSTANCES be allowed to touch the pressure sensitive
diaphragm. Pressure couplings should be sealed against the outer face at the pressure port entry using
bonded seal washer such as:-
Part
Number
Description Dowty Ref
GA29 G¼ bonded seal up to +100°C operation 400-021-4490-02
GA30 G¼ bonded seal up to +200°C operation 300-021-0967-02
GA31 G1/8 bonded seal up to +200°C operation 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 7/8 inch AF (22.2mm) wrench on the hexagon provided and apply maximum
torque of 20 lbf-ft (27Nm). The Customer must ensure that the pressure seal is suitable for the
application. If in doubt contact Setra Systems.
Vibration: Where present, mount in a saddle clamp such as part number GA17 (material:
Polypropylene) or GA20 (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.