Emerson Process Management MSP900SH User Manual

Installation, Operation & Maintenance Manual

IP2040/IM, Rev. AA
May 2007

MSP900SH

Mobrey

MSP900SH Series Level Transmitter

Software version 2.1

www.mobrey.com

Page 1

MSP900SH

Installation, Operation & Maintenance Manual

IP2040/IM, Rev. AA

May 2007

CONTENTS

Page

1. Introduction 3

2. The MSP900SH ultrasonic level transmitter 3

2.1 Type numbering system 3

2.2 Safety data 4

2.3 Pressure Equipment Directive 4

2.4 Specifications 4

3. Installation 5

3.1 Location of the MSP900SH transmitter 5

3.1.1 General considerations 6

3.1.2 Liquid surface conditions 6

3.1.3 In-tank / well effects 6

3.1.4 Open Channel Flow installations 6

3.2 Mounting the transmitter above the liquid surface 8

3.3 Wiring 8

3.4 Additional components in the 2 wire loop 9

3.4.1 Safety Barriers 9

3.4.2 Lightning / surge protection and other loop devices 9

3.5 Wiring to allow HART communication 9

3.6 Use with Mobrey Measurement MSP90 Series controllers 9

3.6.1 Wiring 10

4. Maintenance 10

5. Commissioning / Programming 11

5.1 Current output 11

5.2 Hart programming of the MSP900SH transmitter 11

6. Accessories 12

6.1 Submersion sheild 12

6.2 Head Verification Device 12
Appendices
Appendix 1 MSP900SH Programming parameters 13

Appendix 2 Use with Mobrey Measurement MSP90 Series controllers - Example 14
Appendix 3 71097/1131 FM Intrinsically Safe Control (Entity) Drawing 15

Footnote :-
In this manual the following terms are used which refer to trademarks from other manufacturers:

HART: is the protocol adopted for the MSP900 SMART Communications.
HART is a registered trademark of the HART Communications Foundation and is a mnemonic for
Highway Addressable Remote Transducer.

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Installation, Operation & Maintenance Manual

IP2040/IM, Rev. AA
May 2007

MSP900SH

1.0 Introduction

The MSP900 ultrasonic level transmitter is designed to be mounted above a liquid and will measure the distance to the liquid
surface.
When programmed with details of the vessel, sump or open channel, the MSP900 will compute level, contents or flow and give
a 4-20mA signal proportional to the chosen variable. Full programming details are given in the Operating Manual IP2040/OM.

MSP900 is a two wire 24V dc loop powered transmitter and may be connected to any suitable dc power source using the
factory fitted cable. The Mobrey Measurement MCU900 range of Control Units is designed to be use d with the MSP900
Transmitter in this way.

The MSP900 transmitter may be mounted in a hazardous area provided th at it is supplied from a protected power supply.
When using the MSP900 transmitter with an MCU900 Control Unit, no external Intrinsically Safe Barriers are required as all
protection is built-in to the MCU900 Control Unit.
When using any other power supply, it is the responsibility of the user to ensure suitable Intrinsically Safe Barriers ar e
installed. Full details are given in section 3.4.1

2.0 The MSP900SH ultrasonic level transmitter.
The transmitter is a factory sealed unit with an operating range of 0.3m to 12m. When powered up the transmitter will give a

4-20mA signal on the two wire power cable over the factory default range : 4mA at 12m; 20mA at 0.3m. This range may be
adjusted using a HART programmer. See section 5.0
(Note: full programming instructions are given in the Operating Manual IP2040/OM)

Fig (i)
A Stainless Steel mounting bracket and 1” thread type – G1” (1” BSPP) (-A); 1” NPT (-U) Nylon locknut are supplied with the

transmitter to facilitate mounting.

2.1 Type numbering system
MSP Mobrey Ultrasonic level trans mitter

900 UPVC construction, 12m operating range
SH Factory sealed transmitter, HART communications

-A ATEX & CSA certified intrinsically safe for Zone 0

-U FM & CSA certified intrinsically safe for Zone 0 and FM for DIV 1

/3 Fitted with 3m two core shielded cable
/20 Fitted with 20m two core shielded cable
/50 Fitted with 50m two core shielded cable

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MSP900SH

Installation, Operation & Maintenance Manual

IP2040/IM, Rev. AA

May 2007

2.2 Safety Data

Type numbers MSP900SH-A/** MSP900SH-U/**
Certificate numbers ATEX BAS01ATEX1061X FM 3021193
CSA 1352094X CSA 1352094X
ATEX Coding
(EU Directive 94/9/EC) II I G

Cenelec Coding EEx ia IIC T4 (-40°C<
EEx ia IIC T6 (-40°C<

Ta<60°C)
Ta<55°C)

CSA Coding Ex ia IIC T4 (-40°C<Ta<60°C) Ex ia IIC T4 (-40°C<Ta<60°C)
Ex ia IIC T6 (-40°C<

Ta<55°C) Ex ia IIC T6 (-40°C<Ta<55°C)

FM Coding IS/I/1/ABCD T6 Ta = 55°C
T4 Ta = 60°C
IS/I/0/AEx ia IIC T6 Ta = 55°C
T4 Ta = 60°C

Safety parameters
Ui 30 V Ui (Vmax) 30 V
Ii 120mA Ii (lmax) 120mA
Pi 0.82W Pi 0.82W
Li 27mH Li 27mH
Ci 5nF Ci 5nF

2.3 Pressure Equi pment Directive

The MSP900SH transmitter does not enclose a pressurised volume and therefore is a component a nd outside the scope of the
Pressure Equipment Directive 97/ 23/EC.

Accordingly, the Declaration of Conformity for the MSP900SH does not list the Pressure Equipment Directive.

2.4 Specifications

Materials of construction:
Body Material UPVC (stabilised)
Cable sealant Epoxy adhesive
Locknut Nylon
Bracket 316 Stainless Steel
Cable PVC sheathed two core shielded cable
Electrical
Supply voltage
Transmitter in Non Hazardous area: 12-40V dc
Transmitter in Hazardous area: 12-30V dc
Output 4-20mA
Communications HART Digital communicatio ns (Rev. 5)

Earthing None required

Cable size Overall diameter 4mm, two cores each 0.22 mm

2

Cable length 3m, 20m or 50m.
Cable resistan c e 0.1 Ohm per metre length.

Operating
Range 0.3 to 12m
Temperature
Ambient -40°C to +60°C
Wetside -40°C to +60°C
Pressure 0 bar to 3.0 bar
(restricted to 0 - 1.0 bar for use in Canada)

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Installation, Operation & Maintenance Manual

IP2040/IM, Rev. AA
May 2007

MSP900SH

3.0 Installation

The MSP900SH may be mounted in a hazardous area provided it is supplied through or from a suitably protected
power supply (such as the Mobrey Measurement MCU900 Series).

Refer to the safety parameters given in section 2.2 and safety instruction leaflet IP2040/SI (-A), 71097/1131 (-U).

3.1 Location of the MSP900SH transmitter

The transmitter must be installed in a location where it is protected from ultraviolet radiation, in
order to prevent long term degradation of the plastics used in its construction e.g. shrouded from
direct sunlight.

Correct location of the transmitter is essential for the reliable operation of any ultrasonic level
measurement system. Whilst the transmitter may be site tuned to deal with most application
conditions, it is strongly recommended that the following guidelines shoul d be adopted wherever
relevant.

For maximum accuracy and stability of the level measurement reading the transmitter should

always be shrouded from direct sunlight and any radiated heat.

The transmitter should be mounted as near vertical as possible to ensure
a good echo from the liquid surface and maximum echo size received.
The beam angle (to the half power point) of the transmitter is 12 degrees
inclusive.

If the transmitter is located near the side of the tank or well, there will be
no false echo generated provided the wall is smooth and free of
protrusions.

However, there will still be a reduction in the echo size. To avoid large
echo size loss, it is recommended that the transmitter never be mounted
closer than 300mm to the wall.

Fatty, dirty or viscous liquids can cause a “scum line” to build-up on the tank or well wall. Avoid false echoes from this by
enabling “scum line prevention” software in the MCU control unit.

If the transmitter is mounted in an enclosed tank, avoid mounting the transmitter in the centre of the tank roof as this could act
as a parabolic reflector and create unwanted echoes.

If the transmitter is mounted in a stand-off or nozzle, it is always preferable
that the transmitter face be at least 5mm proud of the stand-off such that it
protrudes beyond the stand-off and into the tank.

Remember that the minimum operating range of the transmitter is 300mm.
The transmitter will not detect any liquid surface closer than 300mm to the
transmitter face.

Obstructions in the tank or well may generate echoes which can be
confused with the real liquid surface echo. Obstructions within the beam
angle generate strong “false-echoes”; wherever possible, the transmitter
should be positioned such that false echoes are avoided.

To avoid detecting unwanted objects in the tank or well, it is advisable to
maintain a distance of at least 0.11m from the centre line of the
transmitter for every metre range to the obstruction.

Page 5