Spectrex 40/40U-UB - UV Flame Detector - Manual (Page 13)

Overview 1
1 Introduction
➣ In this chapter…
Overview page 1
Model and Types page 2
Features and Benefits page 4
Principles of Operation page 4
Performance Considerations page 7
Internal Detector Tests page 14
1.1 Overview
There are two versions of the 40/40 Series UV Flame Detectors: Model
40/40U and model 40/40UB that also includes a Built in Test (BIT) feature.
The 40/40UV Flame Detectors detect hydrocarbon based fuels and gas fires,
invisible hydrogen flames and fires from hydride, ammonia, saline and other
organic fires.
Note: This type of detector should not be exposed to a UV radiation source,
for example; welding, sparks and an electronic arc, as it will result in a false
alarm.
All 40/40 series detectors include a heated optical window for improved
performance in icing, snow and condensation conditions.
Detection performance can be easily adapted to all environments,
applications and requirements, by changing the detector’s configuration
parameters. Adjusting these parameters, as well and performing other
maintenance and monitoring tasks, is possible by means of RS485-based
Modbus communication or HART communication (in models with 0-20mA
output).
The detector enclosure is ATEX certified Exd flameproof with an integral,
segregated, rear, Exe terminal compartment (avoiding exposure of the
sensors and electronics to surrounding environment). Hence the combined
approval:
Ex II 2 G D
Ex de IIC T5 Ta -55°C to +75°C
Ex tD A21 IP66/X7 T95°C
or
Ex de IIC T4 Ta -55°C to +85°C
Ex tD A21 IP66/X7 T105°C