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 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). Sensitivity Ranges: The detector has two response levels: 1. Warning (Pre-alarm) 2. Alarm Response Time: The typical response time of the detector is 3 seconds. for 1 sq. ft. gasoline fire. Other Fuels: 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.

Electrical Specifications 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. Mechanical Specifications a. Enclosure: 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 ATEX 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 e. Dimensions: Detector: 5.2 x 5.2 x4.7in (132 x 132 x 120 mm) f. Weight: 3.7kg ( 8.1lb) - Al. enclosure 6.5kg (14.3 lb) - St.St. enclosure