Specification
26
Specification
Housing
Electro-polished ANSI type 316 marine grade stainless steel
Brackets
Electro-polished ANSI type 316 marine grade stainless steel
Cover
ABS moulded plastic
Lens
Treated optical glass.
Integral Cable
(if fitted)
Armoured, flame retardant, halogen free, MUD resistant
Operating range
4 to 60m, 30 to 120m or 100 to 200m Transmitter to Receiver
Operational limit
-40°C to +60°C (-40°C to +140°F), 800 to 1100 hPa, 0 to 100% r.h.
Span
Configurable between 0 - 4 LELm and 0 - 8 LELm.
Source
Xenon flashlamps with built-in redundancy. First lamp failure causes Receiver to output warning, operation contin-
ues with unchanged calibration. Source module field-replaceable by Draeger personnel.
Calibrations
No field calibration required. Receiver holds factory-calibrations for up to four gases or gas mixtures, switchable by
field configuration. The LEL/LFL values for calibrations are to IEC 61779 (factory-option of NIOSH or EN 50054).
Gases detected include the alkane series methane to hexane. Receiver version optimised for ethylene (ethane)
has separate part number. Warm-up time : 12 s. Beam block time during power interruptions (≥ 10 ms) : 12s.
Response time
With Rx Tx digital link: Normally ≤ 2.0 seconds to ≥90% following a step change in path-integral concentration.
Increases to ≤10s to achieve maximum performance in reduced visibility due to fog etc.,
Without Rx Tx digital link: Normally ≤ 2.5 seconds to ≥90% following a step change in path-integral concentra-
tion. (NOTE: Operation without link is not recommended for locations liable to reduced visibility due to fog,
snow, dust storms etc.)
Interference
Immune to common contaminants and sun and flare radiation.
Alignment
Built in sensor system with separate “radar” displays on Handheld screen for Transmitter and Receiver alignment.
Zeroing not possible unless correctly aligned (≤ ± 0.15
o
). Tolerance ± 0.6
o
before Beam Block.
Mounting
Dual clamping gimbals assembly.
Firmware
Upgradeable by portable PC connected to local Handheld port or remote AI500 interface.
Outputs
Self configuring current sink or source. Fully linearised 4-20 mA gas signal with Fault at 0 mA, Beam-block at 2
mA, and a configurable Pre-warning for dirty or misaligned optics, broken Rx-Tx link, or first lamp failure (0 to 5 mA,
default 3.5 mA). LEL.m = ((I (in mA)-4 mA)/ 16 mA * (full scale)). Overrange at 20.5 mA. Output is self-configuring
for current-source and current-sink circuits. Interrogation/diagnostics of the detector, locally via the handheld
device, or remotely via 4
th
-wire digital link to AI500.
Connections
Transmitter: three wire (3rd wire optional for Rx-Tx digital link).
Receiver: four wire (4th wire optional for digital communications and Rx-Tx link).
Power Supply
Voltage: 18 - 32VDC (24VDC nominal)
Power Comsump-
tion
Rx max: 5 W
Tx max: 13W
Current: ≤ 0.95 A typical @ 24 volts DC
Temperature
-40 to 60
o
C operating, with integral sun cover. Flare radiation ≤ 2kW/m
2
at ≥30
o
to optical axis continuously;
≤ 3kW/m
2
at ≥ 30
o
to optical axis for ≤ 20 minutes)
Storage
Temperature: - 40
o
C ...60
o
C/ -40
o
F ...140
o
F
Humidity: 0...95% r.H.
Pressure: 700...1300 hPa.
Repeatability
± 0.1 LFLm
Optics
Integral heater to eliminate snow/icing.
Data-logger
Integral with non-volatile memory. Records events and max-min operating parameters with 2 hr resolution, overwrit-
ten after 8 days. Consolidated weekly records for 32 weeks. Both records readable locally via Handheld Terminal
or remotely via AI500 interface to Handheld or portable PC.
Dimensions
338 x 258 x 216mm
Weight
With eX link connector plug and socket
Transmitter 5.5kg
Receiver 5.5kg
With junction box and flying lead
Transmitter 7.0kg
Receiver 7.0kg
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