Honeywell MPD Series User Manual

MPD Operating Manual
8
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 - Specications). 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 specic 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
4
, IC1 = Infrared CO
2
).

Honeywell MPD Series Specifications

General

Brand	Honeywell
Model	MPD Series
Category	Accessories
Language	English