Setra System Model 524 - Manual (Page 4)

* 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 listed in
these instructions.
* Liquid must not be allowed to freeze in the pressure port.
MECHANICAL INSTALLATION
The pressure transducers have been designed for measuring hydrostatic level by suspension from the
cable.
For calibration purposes a G¼AT external pressure port has been provided and is accessible by
removal of the nose cone.
ELECTRICAL INSTALLATION
All types include suppression devices providing transient protection to EN 61000-4-2 and EN 61000-
4-4. Conformity with the requirements of the CE mark only applies when connection is made with Setra
Systems approved cable, see APPROVED CABLE section, and is connected as shown below:-
Millivolt Output Transducers: Four wire shielded cable should be used with the cable shield
connected to the instrumentation ground. The cable shield should not be connected to the transducer
body.
High Output Transducers: The shield of the cable must be grounded at the instrumentation end. If
a 'Ground Loop' problem is encountered when the body of the unit is grounded by the piping it is
permissible to remove the cable shield from the instrumentation ground.
APPROVED CABLE
Setra Systems uses cables comprising 7 color-coded wires, with a central vent tube, enclosed by an
aluminium/polyester shield where the shield is in contact with a separate drain wire. The outer sheath is
Polyurethane.
OPERATION
Having installed the transducer as instructed, it is ready for use. Before applying power, check that the
correct polarity and excitation levels are being applied. See Table 1 for electrical connections.
CALIBRATION
Transducers are calibrated to the range requested at time of order.
LOAD CHARACTERISTICS (4-20mA Current Output)
The total resistive load in the loop (to include all the cable resistance) can be from 'zero to 50 x (supply
volts -8) ohms' e.g. with a 24V d.c. supply the permissible load is from zero up to 800 ohms.