Honeywell MPD Operating Manual
Operating Manual
Multi-Purpose Detector (MPD)
Table of Contents
Safety......................................................................................................5
1. Introduction .......................................................................................8
1.1.1 Naming Conventions .......................................................8
1.2 Principle of Operation ..............................................................9
1.2.1 Catalytic Bead Sensor MPD-**-CB1 ................................ 9
1.3 Accessories .............................................................................. 9
1.3.1 Collecting Cone .............................................................10
1.3.2 Weatherproof Cap .......................................................... 10
1.3.3 Sample / Calibration Gas Flow Adaptor ........................11
1.3.4 Gassing Point Assembly ................................................ 11
1.3.5 Duct Mount Kit ............................................................... 12
1.3.6 Filters .............................................................................12
2. Installation .......................................................................................13
2.1 Unpacking ............................................................................... 13
2.2 Sensor Orientation ................................................................. 13
2.3 MPD Remote Mount ...............................................................13
2.4 Wiring ...................................................................................... 14
2.4 Cable Connections .................................................................14
2.5 Fitting Sensors ....................................................................... 15
3. Fitting Accessories .........................................................................16
3.1 Collecting Cone ...................................................................... 16
3.2 Weatherproof Cap .................................................................. 16
3.3 Sample/Calibration Gas Flow Adaptor ................................. 16
3.4 Filters ......................................................................................16
3.5 Duct Mount Kit ........................................................................16
4. Maintenance.....................................................................................17
4.1 General .................................................................................... 17
4.2 Cleaning .................................................................................. 17
5. Faults ................................................................................................ 18
6. Functional Gas Test (Bump Test) .................................................. 19
6.1 Sensor without Accessories ................................................ 19
6.2 Sensor with Collecting Cone or Weatherproof Cap ............19
6.3 Sensor with Sample/Calibration Gas Flow Adaptor ...........19
7. Calibration ........................................................................................20
7.1 Zero and Span Calibration for MPD Sensors with XNX
Universal Transmitter ..............................................................20
7.2 Cross Calibration procedure for MPD-CB1 .........................22
7.3 MPD-CB1 Flammable Sensor Operational Life ...................24
7.4 Meter Multiplication Factors for MPD-IF1 ............................ 24
8. Replacement Parts .......................................................................... 25
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3
8.1 MPD Catalytic Bead and IR Replacement Sensor Cartridges
.......................................................................................................25
8.2 Terminal Housings ................................................................. 25
8.3 Maintenance Spares ..............................................................25
8.4 MPD Calibration Gases..........................................................26
9. Specifications .................................................................................. 26
9.1. General Specifications .........................................................26
9.2 Performance Data ..................................................................26
9.3 MPD-CB1 ................................................................................. 28
9.2.1 MPD-CB1 Cross Sensitivity ...........................................28
9.4 MPD-IV1...................................................................................29
9.5 MPD-IF1 ................................................................................... 30
9.6 MPD-IC1 ..................................................................................31
9.7 MPD Certifications by Part Number Series..........................32
9.7.1 MPD Certification Labels ............................................... 33
10. Warranty ......................................................................................... 34
11. EC Declaration of Conformity ...................................................... 36
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MPD Operating Manual
Safety
» Ensure that this Operating Manual is read and understood BEFORE installing, operating,
or maintaining the equipment.
» Pay particular attention to Warnings and Cautions.
» All document Warnings and Cautions are listed here and repeated where appropriate in
the relevant chapter(s) of this Operating Manual.
WARNINGS
» Agency approvals are associated with specific Sensor/Housing combinations
rohibiting field upgrade of sensor types. The MPD part number, serial number, sensor
type and target gas should be provided when ordering replacement sensors (See
Section 8.1 MPD Catalytic Bead and IR Replacement Sensor Cartridges).
» High off-scale readings may indicate an explosive concentration of gas.
» To maintain safety standards, regular maintenance, calibration and operation of this
equipment by qualified personnel is essential. Read and understand this manual
completely before operating or servicing. If any further details are required which
do not appear in this manual contact Honeywell Analytics or their agent.
» The Code of Practice regarding ‘Selection, Installation and Maintenance of Electrical
Apparatus for use in Potentially Explosive Atmospheres’ must be complied with at all
times. Refer to the appropriate local or national regulations relative to the installation
site. Elsewhere the appropriate local and/or national regulations should be used.
» As some test gases may be hazardous, the Flow Adaptor outlet should exhaust into
a safe area.
» Operators must be fully aware of the action to be taken if the gas concentration
exceeds an alarm level.
» Before installing the sensors, isolate the power supply by disconnecting or removing
the associated control module from the installation.
» Appropriate care should be taken when handling cylinders of compressed flammable
and toxic gases during calibration and bump testing.
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5
CAUTIONS
» To maintain safety standards, regular maintenance, calibration and operation of the
equipment by qualified personnel is essential.
» Do not modify or alter the sensor construction as essential safety requirements
may be invalidated.
» When replacing sensors, dispose of used sensors in accordance with local
disposal regulations. For more information on sensor disposal, contact your HA
Representative.
» The catalytic detector element is resistant to catalyst poisons, however, abnormally
high concentrations of halogenated hydrocarbons, vapors of heavy metals or
compounds, some silicone compounds and sulfur compounds may cause loss of
sensitivity.
» The MPD must never be used in conditions where there is insufficient oxygen to
totally oxidize the combustible gas. For most combustible gases, an oxygen level
of at least 15% is sufficient.
» The sintered disc on the sensor assembly must be kept free from contaminants;
i.e. oil and dirt.
» The sensitivity of catalytic sensors is impaired by silicone compounds. Do not expose
the sensors to silicones or silicone-based products.
» The relevant site procedures must be obeyed at all times when opening the Terminal
Housing or removing the sensor in a hazardous areas.
» The sensitivity of Catalytic Sensors is impaired by silicone compounds. Do not expose
to silicones or silicone based products.
» Dismantling of a sensor or a sensor installation by other than authorized engineers
invalidates certification.
» Upward pressure on the gassing nozzle of the Weatherproof Cap forces the nozzle
against the sinter. Rotation of the nozzle may damage the sinter if a filter is not fitted.
» Direct gassing of the sensor via the nozzle on the Collecting Cone in wind speeds of
greater than 5 meters per second may cause errors.
» The calibration procedure should only be performed by qualified personnel.
» Before initial calibration allow the detector to stabilize for 30 minutes after applying
power. When in zero and span calibration mode the current output from the detector
is inhibited (e.g. default 2mA) to avoid false alarms.
» Extended or frequent exposure to elevated concentrations of combustible gases
may affect sensor sensitivity. Verify sensor performance by frequent calibration.
» Where the user calibrates any sensor using a different gas, responsibility for dentifying
and recording calibration rests with the user. Refer to the local regulations where
appropriate.
» These (meter multiplication) factors only apply to gas concentrations expressed in
% Volume terms.
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MPD Operating Manual
» When using a linear cross reference factor the temperature compensation is based
upon propane, and there may be errors at temperatures away from the calibration
temperature.
» To maintain safety standards, regular maintenance, calibration and operation of the
equipment by qualified personnel is essential.
» Do not modify or alter the sensor construction as essential safety requirements
may be invalidated.
» When replacing sensors, dispose of used sensors in accordance with local
disposal regulations. For more information on sensor disposal, contact your HA
Representative.
ATEX Temperature Code Ratings
» Component gets no hotter than an operating temperature code of T4 when installed
according to the electrical specifications of Label ( Sch Drawing 1226E0309)
» Maximum surface temperatures is less than 85°C when measured under normal
operating conditions for the Dust evaluation.
Important Notices
Every effort has been made to ensure the accuracy of the contents of our documents,
however, Honeywell Analytics can assume no responsibility for any errors or omissions in
our documents, or their consequences.
Honeywell Analytics can take no responsibility for installation and/or use of its equipment if
this is not done in accordance with the appropriate issue and/or amendment of the manual.
The user of this manual should ensure that it is appropriate in all details to the exact equipment
to be installed and/or operated. If in doubt, the user should contact Honeywell Analytics for
advice.
If further details are required which do not appear in this manual, contact Honeywell Analytics
or one of their agents.
MPD Operating Manual
7
1. Introduction
The MPD (Figure 1) is a serviceable explosion proof housing, offered with either
catalytic bead or infrared sensors for the measurement of ammable and toxic
gases. The assembly is constructed of 316 stainless steel and is supplied in either
¾ inch NPT or M25 thread versions with corresponding approvals (See Section
10 - Specications). The sinter assembly can easily be removed for same sensor
replacement.
WARNING:
Agency approvals are associated with specific Sensor/Housing combinations
prohibiting field upgrade of sensor types. The MPD part number, serial number,
sensor type and target gas should be provided when ordering replacement sensors
(See Section 8.1 MPD Catalytic Bead and IR Replacement Sensor Cartridges).
The MPD can be mounted directly to a transmitter such as the XNX Universal
Transmitter or other suitable device in a hazardous area, or remotely mounted to a
transmitter located in a non-hazardous area. For remote mounting, the detector is
tted to an optional junction box. The ¾ NPT type is supplied with factory sealed
leads eliminating the need for a pour gland between the detector and the junction
box.
Optional accessories such as collecting cone, weatherproof cap or alternative
sampling systems can be installed to the MPD via the M40 external thread provided
on the sensor retainer. A M40 (female) to M36 (male) adaptor can be ordered,
offering additional accessory selections.
The presence of target gas is indicated via a millivolt electrical interface for all
sensor types via three wires. Two additional wires provide a digital interface for
the infrared version. When appropriately interfaced with a controller, the controller
can provide outputs such as display, 20mA, relay, etc.
The MPD detector must be installed in accordance with local and national
requirements for the installed area and application. Reference drawing number
1226E0351 for specic installation requirements.
Honeywell recommends periodic bump testing of the sensor to ensure proper
operation and compliance with the functional safety rating of the installation.
1.1.1 Naming Conventions
MPD sensor models are in the format MPD-XX-YYY. XX designates agency approval
(AM = ATEX/IEC Ex with male M25 thread, UT = UL/CSA or UL with male 3/4“
NPT thread, BT = UL/INMETRO with male 3/4“ NPT thread), YYY designates the
sensor Type (CB1 = Catalytic bead % LEL, IF1 = Infrared % LEL, IV1 = Infrared %
LEL CH
8
, IC1 = Infrared CO2).
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MPD Operating Manual
3/4” NPT or M25 Threads
Sensor Cell
Sensor Retainer
and Locking Screw
2.080
[52.83]
1.875 [47.63]
(All dimensions reference)
Figure 1. Multi-Purpose Detector (MPD)
[76.62]
2.016
[51.21]
3.016
20AWG Stranded Wire
7.5 [190.5] Nominal Length
1.2 Principle of Operation
1.2.1 Catalytic Bead Sensor MPD-**-CB1
The CB1 sensor, catalytic bead type contains two elements which are heated by a
dened constant electrical current from the transmitter. One element is sensitive to
the presence of combustible gas, the second element compensates for changes in
temperature. When a combustible gas is present, the sensing element temperature
increases due to catalytic oxidation of the gas. The resistance of the element is
proportional to temperature and is proportional to a change to gas concentration.
The catalytic bead sensor provides the broadest range of combustible detection,
widest temperature range and performance approvals.
1.2.2 Infrared Sensor MPD-**-IF1, IV1, IC1
The IF1, IV1and IC1sensors use Non-Dispersive InfraRed (NDIR) Adsorption
techniques to detect a gas or family of gases. The sensor cells contain a long life
tungsten lament infrared light source, an optical cavity into which gas diffuses,
a dual temperature compensated pyroelectric infrared detector, and integral
semiconductor temperature sensor and electronics to process the signals from
the pyroelectric detector.
The IV1 sensor can measure methane concentration in the range of 0-5%Vol or
0-100%LEL. The IF1 sensor can measure propane concentration in the range of
0-100%LEL. The IC1 is used for carbon dioxide monitoring in the rage of 0-5% Vol.
1.3 Accessories
The following accessories are available for use with the sensors:
a. Collecting Cone (Figure 3).
b. Weatherproof Cap (Figure 4).
c. Sample/Calibration Gas Flow Adaptor (Figure 5).
d. Remote Gassing Port (Figure 6).
e. Duct Mount Kit (Figure 7).
f. Filters
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1.3.1 Collecting Cone
(02000-A-1642)
The detection of a lighter than air gas is enhanced by the use of a Collecting Cone.
The cone ts onto the Sensor accessory thread in place of the Filter Housing and
retains the lter. The appropriate lter must be tted.
A nozzle on the cone permits gassing of the Sensor with the cone in position. Test
gas is applied either direct to the nozzle or via a permanently connected pipe-line
when the Sensor is in an inaccessible location.
Figure 2. Collecting Cone
1.3.2 Weatherproof Cap/Housing
(Cap: 02000-A-1640, Housing: SPXCDWP)
The Weather Protection Housing, tted to a sensor installed in an exposed location,
affords protection from driving rain from vertical to 30° below horizontal. When
mounted close to the ground, protection is afforded from heavy rain rebounding
off the ground. It also reduces contamination from industrial waste and enables
the application of test gas in high wind speeds without signicant error.
Incorporated in the housing is a nozzle to facilitate gassing of the sensor with the
Weather Protection Housing in position, either by direct application to the nozzle or
via a permanently connected pipeline. On the Weatherproof Cap (02000-A-1640),
the nozzle is free to rotate within the housing to allow removal from the sensor
without disconnecting a permanently connected pipeline, when changing the
Hydrophobic Barrier and cleaning the sensor.
Weatherproof Cap
10
Sensor Accessory Thread
Figure 3. MPD, Adaptor and Weatherproof Cap
Figure 4. Weatherproof Housing
MPD
MPD Operating Manual
1.3.3 Sample / Calibration Gas Flow Adaptor
(1226A0411)
A Flow Adaptor provides a facility to allow sampling of a closed system by means
of two pipelines. The Flow Adaptor is tted to the sensor accessory thread by a
locking ring that enables the Flow Adaptor to be removed without disconnecting
the pipeline. The Filter is retained by the Flow Adaptor and interfaces with a gasket
bonded to the Flow Adaptor. The Flow Adaptor ports are designed to be tted
with 1/4 in (6mm) soft tubing.
The Flow Adaptor is also used to apply calibration gas to the sensor. See Section
7 - Calibration for further details on calibrating the detector.
Figure 5. Flow Adaptor / MPD with Flow Adaptor
1.3.4 Gassing Point Assembly
(1226A0354)
The Gassing Point Assembly assembly can be xed in a convenient position and
permanently connected by suitable tubing to an inaccessible sensor, thus simplifying
the application of test gas when checking sensor calibration. A DIN Rail Mounting
Assembly (00785-A-0069) is available to enable ve gassing point assemblies to
be mounted side by side.
Device Adapter
Tube Cap
Figure 6. Remote Gassing Port
1/4 in (6mm) I.D.
®
Tubing
Teflon
Mounting Bracket
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1.3.5 Duct Mount Kit
The duct mounting kit (S3KDMK), combined with the MPD Interface Adaptor
(1226A0382), can accommodate the MPD to detect ammable gases in a duct
application. The duct mount kit includes the adaptor, gasket and required fasteners.
The MPD Interface Adaptor includes only the adaptor and requires the S3KDMKduct
mount kit.
1226A0382 MPD Adapter Ring
S3KDMK EC/MPD Duct Adapter Kit
Figure 7. Duct Mount Kit
1.3.6 Filters
In a clean atmosphere, and where no accessories are to be tted, a lter is not
needed. It is however mandatory that a lter should be tted to provide protection
appropriate to the environment and to complete the seal when a Weatherproof
Cap or Collecting Cone is tted.
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MPD Operating Manual
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