003 Sensors

Instruction leafl et

IP246, Rev. AD

April 2010

The Emerson logo is a trade mark and service mark of Emerson Electric Co.

Rosemount is a registered trademark of Rosemount Inc.

Mobrey is a registered trademark of Rosemount Measurement Ltd.

All other marks are the property of their respective owners.

We reserve the right to modify or improve the designs or specifications of product and services at any time without notice.

© 2010 Rosemount Measurement Ltd. All rights reserved.

International:

Emerson Process Management

Rosemount Measurement Ltd.

158 Edinburgh Avenue

Slough, Berks

, SL1 4UE, UK

T el +44 (0)1753 756600

F ax +44 (0)1753 823589 www.emersonprocess.com

Americas:

Emerson Process Managemen t

Rosemount Inc.

8200 Market Boulevard

Chanhassen, MN 55317 USA

Tel (USA) 1 800 999 9307

Tel (International) +1 952 906 8888

Fax +1 952 906 8889

Instruction leafl et

IP246, Rev. AD

April 2010

Mobrey

Ultrasonic liquid level switch

003S Integral sensor series

003 Sensors

Description

Manufactured in Polyphenylene Sulphide

(PPS) for corrosion resistance in most liquids, the 003 range of sensors can be mounted in any position in a tank using either a 1” or 3/4” thread available in BSPP, BSPT and NPT thread forms.

A thread is provided on each side of a hexagonal boss to allow either external or internal / pole mounting of the sensor.

Comprising a one piece moulded body with an integral pcb, the 003 switch is factory sealed and supplied with a 3m fl ying lead for customer connection. The Mobrey 003 switch is designed for high or low level alarm duties to give a voltage free changeover contact or dual solid state transistor output for alarm signalling or as part of a pump control system.

Operation

The moulded body contains two piezo-electric crystals, one each side of a gap at the tip of the sensor.

An ultrasonic signal is transmitted from one crystal into the gap, but if there is air or gas in the sensor gap then the signal is not received by the other crystal. However, if there is a liquid present, the signal will be transmitted and the integral electronics will switch the output circuitry to signal the presence of a liquid.

www.emersonprocess.com

Installation

The 003 sensor may be mounted at any angle in the vessel, although care should be taken to ensure that the liquid is free to drain out of the sensor gap. Position the sensor away from entry or exit points to avoid areas of excessive turbulence or aeration, and avoid installation in the direct fl ow of liquid. Baffl e plates may be used if necessary.

the vessel as follows :-

Parallel threaded models : ensure that the fl at nitrile sealing gasket is in place over the chosen thread to effect a seal between the hexagon surface and the vessel. Screw the sensor into the vessel, taking care not to twist the sensor cable, until the joint is fi nger tight. Using the hexagon, carefully complete the seal by tightening the sensor a further

1/6 of a turn only, such that the sensor gap is as near vertical as possible.

Ensure a clearance of at least 25mm from all sensor surfaces to vessel wall to avoid forming air pockets or sludge traps.

The sensor has a dual thread mounting to allow either internal or external mounting. A thread may be tapped in the vessel wall or, if the vessel has thin walls or is pressurised, a threaded boss brazed, welded or otherwise attached to the vessel wall will be required.

Note the position of the markings on the hexagon fl ats of the sensor which show the orientation of the sensor gap, then install in

Taper threaded models : use PTFE or equivalent pipe seal tape wound around the sensor threads to effect the seal. Screw the sensor into the vessel, taking care not to twist the sensor cable, until the joint is fi nger tight. Using the hexagon, carefully complete the seal by tightening the sensor, aligning the sensor gap as near vertical as possible.

Track the cable to the connection point or a junction box, securing at regular intervals.

Take care not to bend the cable tighter than a 50mm radius.

Wiring

The sensor is factory fi tted with a fl ying lead. Extensions may be made using a suitably weatherproof junction box and a choice of cable that does not introduce excessive voltage drop.

Connections are as follows :-

NO

Red : +ve

Yellow : connected wet

NC

Green : connected dry

Red : +ve

Yellow : connected wet

White : connected dry

White : common

Blue : 0v

Blue : 0v

003S* 003H*

Electrical characteristics

Switching function

Max. switched current

Max. switched voltage

Power supply

Dry current drawn

Wet current drawn

Cable length

Cable sheathing

IP rating of sensor

003S* models

SPCO relay (energised wet)

1A at 30v res.

0.25A at 30v ind.

30v

18-30v dc or ac

10mA nom.

25mA max.

3m : 5 core 7/0.2mm

PVC

IP66/IP68 (3m)

Not suitable for use in intrinsically safe circuits.

Not suitable for the direct starting of large motors.

003H* models

2 x FET open drain

(short circuit protected.)

100mA max.

30v

18-30v dc

8mA nom. (4mA min.)

16mA nom. (20mA max.)

3m : 4 core 7/0.2mm

PVC

IP66/IP68 (3m)

Mechanical / operating characteristics

Sensor material

Operating pressure

Operating Temp.

Ambient temperature

Minimum S. G.

Max. viscosity

Switching response

Hysteresis

Repeatability

Overall length

< 4mm

+/- 2mm

110mm

Length into tank :

external 79mm

Body diameter

Thread size 003*0

003*2

003*5

003S* models

PPS

5 bar

As operating temp.

0.50

5000cSt. at 20 ° C

50ms dry-wet

0.5s wet-dry

22mm

¾” BSPT

1” BSPT

1” NPT

003H* models

PPS

5 bar

-20 ° C to +70 ° C -40 ° C to + 105 ° C

-40 ° C to + 70 ° C

0.50

5000cSt. at 20 °

50ms dry-wet

0.5s wet-dry

< 4mm

+/- 2mm

110mm

79mm

22mm

¾” BSPT

1” BSPT

1” NPT

C

Maintenance

The sensor is factory sealed, contains no moving parts and requires no maintenance in most applications. The sensor may need to be cleaned periodically when used with liquids which could cause a build-up on the sensor surfaces. Note the sensor is not suitable for steam cleaning.

Spare parts

There are no spare parts for this factory sealed switch. A complete new switch should be fi tted.

Meets the requirements of the EMC

European Directive 89/336/EEC

Light Industrial EN61326