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Operation

The Model 97's operation is based on twin electron capture detectors (ECD's). Suspect vapor is drawn into the Instrument through a membrane which isolates it from ambient air. The vapor is then mixed with Argon, an inert carrier gas, and fed down two columns. One of the columns is coated with a special material which selectively retards the progress of molecules from high explosives. Each of these columns terminate in an ECD.

When the vapor/carrier gas mixture enters the ECD it is bombarded by beta particles from a sealed radioactive source (similar to the amount of radioactivity present in ionization smoke detectors). The beta particles dislodge electrons from the carrier gas molecules which supports the ECD's standing current. If molecules from high explosives are present they absorb these free electrons and thus change the standing current and trigger an alarm.

The timing sequence of the signals from the twin ECD's discriminates between vapors from explosives and those produced by similar non explosive substances.

Applications

The Model 97 because of its instantaneous response and rugged construction is ideal for continuous screening applications. It can be used, for example, to check suspect luggage, packages, storage lockers, automobiles, buildings, and people, etc. Model 97 applications include Airlines, Nuclear Power Plants, Military Bases, Police Departments, and Sensitive Government Facilities. The Model 97 is an ideal tool to enhance security at any high risk facility.

Specifications

1. Sensitivity

2. Explosives Detected

3. Response Time 4. Selectivity

5. Detection System

6. Alarm Indicators

7. Other Indicators

8. Controls

9. Power Supply

10. Ready for use

11. Portable Endurance

12. Carrier Gas Gas bottle

1 part explosive vapor in 10" parts air.

Wide variety of military and commercial explosives. Detection matrix available to qualified buyers upon request. 2 seconds or less.

Can rapidly discriminate vapor from
explosives and that produced by other
materials. Shows excellent immunity to
alarms caused by halogenated solvents.
Unique twin ECD gas chromatography
system. Long life NI63 beta source.
Visual and audio alarms.
Each operates independently.
Headphone jack.

Nozzle temperature O.K.
Detector temperature O.K.
Low battery

Low standing current

Bar graph of signal output

Audio on/off for integral loudspeaker Reset

Standing Current check

1. 12 volt rechargeable battery,

6 hour duty cycle

3. in conjunction with battery charger an AC supply of

240 V 30V, 50-60 Hz
120 V 15V, 50-60 Hz

15 minutes or less

Battery-6 hours

Argon-12 hours 99.998% pure Argon

4 ft3

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Description

Used to fill 4 ft3 bottles

Part # 220-027

from large supply

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tank

32.34 lbs (14.7 kg)

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Operation

The Entry Scan Mark II automatically signals each person to enter the portal by means of a green "enter" light. While in the portal, an air sample is collected from around the person being searched by means of a gentle air curtain. This air sample is continuously analyzed in the detection system for the presence of molecules from explosives. The detection mechanism selectively traps vapor of interest from the sample and selectively desorbs it into an argon carrier gas stream which carries it into a high sensitivity Electron Capture Detector (ECD). Any molecules from explosives present in the carrier gas mixture will absorb electrons in the ECD and trigger an audible and visual alarm. An additional interface permits alarms to be routed to an alternate location or to a computer for logging purposes.

At the completion of the detection cycle the Entry Scan signals the person being searched to exit by means of a green light and an audible chime. If the individual should leave the instrument before the cycle is completed, an audible and visual alert signal will be generated. When no personnel are being processed for an extended period of time, the system automatically switches to Standby Mode which conserves argon gas and increases operational life. When the first person to be processed approaches the Entry Scan, the system automatically returns to the normal operating mode.

The Entry Scan presents simplified controls and indicators to enable easy operation and monitoring of the system. In addition, it contains self diagnostics and indicators to facilitate service. A test and calibration option is available which automatically tests the Entry Scan at the push of a button and maintains the circuitry at optimum sensitivity.

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Audible and visual alarms for
Explosives

Non Valid Test and End of Test
Audible Alarm for Access Doors

OPERATIONAL CONTROLS AND INDICATORS
Controls

Standby on/off switch with indicator Main Supply on/off switch with indicator Power Supply on/off switch with indicator

System Test Push Button

Mode Switch with indicators for

each mode

A. Walk Thru Processing Rate

B. Six Seconds Processing Rate C. Eleven Seconds Processing Rate

Alarm Reset Push Button
Display Function Switch for:
A. 24 volt Power Supply
B. 12 volt Power Supply
C. 15 volt Power Supply
D. 15 volt Power Supply
E. Detector Status

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