Specifications
Alarm/Fail RelaysSignal horn: OUTO
Malfunction: OUT1
Alarm 1 (pre-Alarm): OUT2
Alarm 2: (main Alarm): OUT3
Measurement in progress: OUT4
ConnectionsUSB port, ethernet port, USB stick
DescriptionFHT 1702 L Mobile Iodine Monitor
Digital InputsPush button “Ack alarm”: IN0
Signal “Air flow ok”: IN1
Signal “Heating ok”: IN2
Reserved: IN3
Ambient TemperatureOperating: Min. +15°C; Max. +45°C
For Use With (Application)Iodine Monitoring
Detection LimitsMinimum Detectable Activity Concentration (MDAC) provided according to ISO 11929
<1 Bq/m3 related to 131I with t1 = 5 min, t2 = 30 min at a constant dose rate level of 100 nSv/h
<40 Bq/m3 related to 131I with t1 = 5 min, t2 = 30 min at a constant dose rate level of 100 nSv/h (60Co)
Detector Efficiency0.05 Cps/Bq
Detector TypeNaI
Radiation Type131I
Display TypeWindows-based touch screen panel PC
EfficiencyTyp. 0.05 Cps/Bq; 131I
Environmental ConditionsPermitted temp. gradient: Max: 15 K/h
Sampled air intake temperature: Min. -10°C, Max. +45°C with optional heating on
Barometric pressure: Min. 950, Max. 1050 hPa
Rel. humidity of sampled air at intake: Min. 20, Max. 80 % R.H. non-condensing
Filter TypeGlass fiber GF10, grade H12 for prevention of contamination and pollution of the iodine cartridge by aerosols
Air intake flange: DN 16; KF
Air intake filter diameter: 50 mm; fiber glass GF 10
Filter cartridge diameter: 58 mm; charcoal
Cartridge service life: several weeks depending on the iodine conc. of the ambient air
Cartridge activity load: 1 MBq
Inputs6 counters in total
4 counters are used for the three energy windows: Background energy window left; iodine energy window; background energy window right
Product TypeIodine Monitor
Measuring RangeMin. 100; Max. 105 Bq/m3 related to 60 minutes sampling time
Measuring Principle: Fixed filter monitor for the detection of the 364 keV line of 131I by a NaI detector. Compensation of higher energy gamma lines is realized with the help of online background subtraction by the trapezoid method. A built-in lutetium adapter is used for continuous peak-stabilization.
Power Consumption300 VA
PumpRotary vane vacuum pump; oil-free; air-cooled
Air flow rate: typ. 4, Max. 5 m3/h
Supply voltage: 230V AC, single phase
Supply frequency: 50 Hz
Power consumption: 250 VA
Protection class: IP54
Noise level: 68 dB at 1 m distance
Maintence: 2000 operation hours
Resolution10% for 137 Cs
Sensitivity10 Cps/μSvH-1 without compensation
Shielding Type25 mm, lead in all directions
Omni-directional lead shielding made of ring elements above the filter drawer with top lid. A built-in lutetium adapter is used for continuous peak-stabilization is integrated in the lead shield.
Width (English)18.9 in. without packing
Width (Metric)48 cm (Without Packing)
Height (English)51.2 in. without packing
Height (Metric)130 cm (Without Packing)
Depth (English)25.6 in. without packing
Depth (Metric)65 cm without packing
Diameter (Metric) Detector Window50.8 mm
Weight (English)187 lb. net, without packing
Weight (Metric)85 kg (net, without packing)
Electrical RequirementsOperating voltage: 900 V
Unit SizeEach