The Spectrex Model 20/20U, 20/20UB is a UV Flame Detector. It is designed to
sense the occurrence of fire and flames and subsequently activate an alarm or
an extinguishing system directly or through a control circuit for maximum fire
protection. It uses innovative technology of advanced digital signal processing to
analyze the dynamic characteristics of fire.
The Difference between models is that Model 20/20UB includes a Built-In-Test
(BIT) function while the 20/20U does not include the BIT.
Detection performance is controlled by a microprocessor and easily adapted to
all environments, applications and requirements. The result is a unique and
superior flame detector that provides excellent detection sensitivity with extreme
immunity to false alarm.
Detection sensitivity is the maximum distance at which the detector will reliably detect a specific size of fire & typical type of fuel (standard fire).
Standard Fire: Standard fire is defined as a 1ft x 1ft (0.3m x 0.3m) Gasoline pan fire with max. Wind speed of 6.5ft/sec (2m/sec).
The detector has two response levels:
1. Warning (Pre-alarm)
The typical response time of the detector is 3 seconds. for 1 sq. ft. gasoline fire.
The Detector will react to other fuels in standard fire conditions at maximum response time of 5 seconds. The sensitivity range of other fuels varies according to the fuel type. The
percentage of the range for a fuel type that is relative to gasoline standard fire source is given at Table 1 below.
a. Operating Voltage: 18-32 VDC
b. Power Consumption:
Max. 80mA in Stand-by
Max. 120mA in Alarm
c. Electric input protection:
The input circuit is protected against voltage reversed polarity voltage transients, surges and spikes according to MIL-STD-1275A.
Aluminum: Chromate coating and Epoxy enamel finish or Stainless Steel 316: Electrochemical passivation coating
b. Explosion Proof
FM approval Class I Div. 1 Groups B, C and D;
Class II Div. 1 Groups E, F and G.
Ex II 2G SIRA 00ATEX 1160, 1162
EExd IIB + H2 T5 Temp. -40°F (-40°C) to 160°F (70°C)
T4 Temp: -40°F (-40°C) to 185°F (85°C) per EN 50014 & EN 50018
EExde IIB + H2 T5 Temp. -40°F (-40°C) to 160°F (70°C) per EN 50014, 50018 & 50019
(see Appendix C)
c. Electrical Modules: Conformal coating.
d. Electrical connection:
Either: Two 3/4” - 14NPT conduits. or: Two M25 x 1.5 cable entries
Detector: 5.2 x 5.2 x4.7in (132 x 132 x 120 mm)
3.7kg ( 8.1lb) - Al. enclosure
6.5kg (14.3 lb) - St.St. enclosure