Gems Sensors & Controls SERIES 35XX Instruction Bulletin

GEMS SENSORS & CONTROLS

OPERATING & INSTALLATION INSTRUCTIONS

SERIES 35XX

PLEASE READ CAREFULLY BEFORE INSTALLING

Part Number: 560550-0128 Issue: A

INTRODUCTION

Series 35XX high output pressure transducers and transmitters are fitted with an Asic providing
various optional (at time of order) voltage outputs, and a 4-20mA current output capable of being
used in control and indicating loops without further amplification.

Series 35XX with the CE Mark conform with the essential protection requirements of the EMC
Directive 2004/108/EC by certified type testing to BS EN61326-1:2006 and EN61326-2-3:2006.

Series 35XX with the CE0086 mark also complies with the requirements of the Pressure
Equipment Regulations 1999 and is classed as a safety accessory and can be used as a safety­related device on Category IV pressure equipment. No other product should be used as “Safety
Accessories” as defined by the PED Article 1, Paragraph 2.1.3.

HAZARDOUS PRODUCTS

The Consumer Protection Act of 1987, Section 6 of the Health and Safety at Work Act 1974 and
the Control of Substances Hazardous to Health Regulations 1988 require that we advise recipients
and users of our products of any potential hazards associated with their storage, handling or use.

The products which our Company supplies may be classified as Electrical, Electro-Mechanical
and Electronic equipment.

These products are tested and supplied in accordance with our published specifications or
individual special requirements that are agreed in writing at time of order. They are constructed
so as not to affect adversely the safety of persons and property when properly installed,
maintained and used by qualified personnel, in the applications for which they were designed and
manufactured.

Conformity with the requirements of the CE mark only applies when the installation
conditions described in these instructions have been met. For units supplied without a cable
assembly connection to the transducer must be accomplished using Gems Sensors approved
cable. See APPROVED CABLE section.

GENERAL

* Transducer should not be subjected to greater than the maximum allowable pressure (P.S.)

/ Temperature (T.S) as defined on the transducer label.

* Transducer should not be subjected to mechanical impact.

* 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

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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/transmitter wetted parts listed in

these instructions.

* Liquid must not be allowed to freeze in the pressure port.

* The gasket must be fitted under the electrical connector (mini-din only).

* Supply voltage must not exceed the value stated on the unit label.

MECHANICAL INSTALLATION
Mounting: Pressure Transducer is designed to be attached by the coupling thread only. Omni-

directional, self supported directly into the pipework. Use a 22mm spanner on the hexagon
provided to apply a maximum torque of 15Nm. The Customer must ensure that the pressure seal
is suitable for the application. If in doubt contact Gems Sensors.

ELECTRICAL INSTALLATION

All types with the CE Mark include suppression devices providing EMC protection to EN 61000­4-2, EN 61000-4-3, EN 61000-4-4 and EN61000-4-6. Conformity with the requirements of the
CE mark only applies when connection is made with Gems Sensors approved cable, see
APPROVED CABLE section, and is connected as shown below:-

APPROVED CABLE

Gems sensors uses cables comprising 2, 3 or 4 colour-coded cores, enclosed by an aluminised
polyester screen where the screen is in intimate contact with a separate drain wire. The outer
sheath is chrome PVC and overall diameter is approximately 4 mm.

OPERATION

Having installed the transducers as instructed, they are ready for use. The transducer should not

be removed whilst the system is at pressure. 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 datum requested at time of order; this can be identified by the
sixth letter of the identification code as follows:-

A - Absolute datum
G - Gauge datum vented to atmosphere via the electrical connector or cable

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 -7.5) ohms' e.g. with a 24V d.c. supply the permissible load is from zero up to 825
ohms.

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