FH 40 G Multi-Purpose Digital Survey Meter
FH 40 G Multi-Purpose Digital Survey Meter
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Thermo Scientific™

FH 40 G Multi-Purpose Digital Survey Meter

Use one convenient, versatile instrument for multiple radiation detection applications including personal radiation protection and beta, x-ray and gamma radiation detection.
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Catalog NumberDescription
425401401Sv/h display used w/calibrated probes
4254002Without extra earphone connection, measuring range 1 µR/h-100 R/h
425400201Measuring range: 0.1 pSv/h-0.99 Sv/h, 36 keV to 1.3 MeV
4254004Without earphone connector, measuring range up to 10 R/h
425400401Without extra earphone connection, measuring range up to 0.1 Sv/h
425400450Measuring range: up to 10 R/h, calibrated in R/h; extra earphone connector
4254006Without extra earphone connector
425400650Measuring range: up to 1 Sv/h; 30 keV to 4.4 MeV
4254008Export version with selectable calibration factor
425400802No nanosievert units
425400850With extra earphone connector
425400852Extra earphone connector, no nanosievert units
4254009Radiameter (FH 40 GL-omega), Special version of FH 40 GL
4254014R/h display used w/calibrated probes
425400250Measuring range: 10 pR/h-99R/h, 36 keV to 1.3 MeV
FH40GLDS3Warranty for FH 40 GL
425400451With extra earphone connection, measuring range up to 0.1 Sv/h
4254016Special version FH 40 GL-10, with connection of earphone or external alarm relays
425400251With earphone connector
425401450R/h display, extra earphone connector
Catalog number 425401401
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Description:
Sv/h display used w/calibrated probes
Serve multiple radiation detection applications with one versatile instrument. The Thermo Scientific™ FH 40 G is a wide range digital Geiger counter suitable for nearly all measurement tasks arising in radiation protection through optional plug and play probes available for neutron measurement, alpha and beta contamination readings and even to detect artificial gamma radiation in variable natural radiation fields.

The FH 40 G is a versatile multipurpose Geiger counter and area monitor that can be used with external detectors for portable and remote area monitoring applications.

  • Rugged, waterproof and reliable with very simple operation.
  • Gamma meter with internal proportional counter tube.
  • Integrated gamma dose rate measurements.
  • Interface for one optional, external plug and play probe.
  • Alarm thresholds for the internal detector and external probes of the FH 40 G are monitored simultaneously.
  • Upon connection of an external plug and play probe, the probe parameters are automatically read into the FH 40 G and the correct parameters are set.
  • High voltage generation inside the plug and play probe makes the system calibration independent of cable length.
  • Separate alarms can be set by the user for both the internal and external detectors.
  • Operational internal proportional detector and connected external detector.
  • Serial infrared interface.
  • Type tested by PTB (German version).
  • Type tested for use by German fire brigades.
  • Simultaneous operation of internal and external detectors, both dose rate and remote dose rate readings.
  • Configuration and data read out via PC.
  • Waterproof (IP 67) and shock resistant.
  • ADF mode (Advanced Digital Filter).
  • Clear, backlit LCD display.
  • Datalogging capability.
  • Internal diagnostics ensure proper functioning of the detector(s) and the electronics.
  • Designed to record up to 256 data points containing measurement number, date, time and dose rate at the internal detector and external detector, status, and optional barcode information.
  • Wide range of plug and play external probes for monitoring and detection.
  • All FH 40 G versions and external probes containing the “-10” suffix are designed to meet the energy response behavior of the new SI-units ambient dose equivalent and ambient dose equivalent rate according to ICRU 39.

Short summary of available plug and play probes:

  • Gamma dose rate measurement: FHT 192 (ionization chamber), FHZ 632 (proportional counter), FHZ 612 (wide range), FHZ 302/312 (under water nuclear power).
  • Gamma search probes: FHZ 502, 503, 512 (NaJ/BGO).
  • Contamination: FHZ 742 (Scintillator), FHZ 732 (Pancake/proportional counter), FHZ 382 (Scintiallator + Alpha/Beta discriminator via LED indication if alphas are present).
  • Aritificial radiaiton discrimination: NBR probe FHZ 672.
  • Preamplifiers for various classic probes.
  • Wide range of accessories like cables, telepoles, application specific kits, etc.
FH G and FH 40 G-L series meters (4254002, 425400201, 425400250, 425400251, 4254004, 425400401, 425400450, 425400451) are not for sale in the UK

The FH 40 G instrument is available in different versions:

FH 40 G

  • Measured Quantity: Roentgen (R)
  • Measuring Range: 1 μR/h ... 100 R/h
  • Energy range: 36 keV ... 1.3 MeV
  • Dose measuring range: 10 μR - 1000 R

FH 40 G-L

  • Measured Quantity: Roentgen (R)
  • Measuring Range: 1 μR/h ... 10 R/h
  • Energy range: 36 keV ... 1.3 MeV
  • Dose measuring range: 10 μR - 100 R

FH 40 G-10

  • Measured Quantity: Sievert (Sv; Ambient dose equivalent rate H*(10))
  • Measuring Range: 10 nSv/h ... 1 Sv/h
  • Energy range: 30 keV ... 4.4 MeV
  • Dose measuring range: 100 nSv ... 10 Sv

FH 40 G-L10

  • Measured Quantity: Sievert (Sv; Ambient dose equivalent rate H*(10))
  • Measuring Range: 10 nSv/h ... 100 mSv/h
  • Energy range: 30 keV ... 4.4 MeV
  • Dose measuring range: 100 nSv ... 1 Sv

FH 40 G-X

  • No internal detector, operation of external plug and play probe only

General specifications of all FH40G units

  • Dimensions 7.7 x 2.9 x 1.7 in. (195 x 73 x 42mm)
  • Weight[s] 0.9 lb. (410g)
  • Battery type: 2 x AA
  • Neutron dose rate measurement: FHT 762 WENDI-2, FHT 772 H-2 REMBALL
  • Neutron search probes: FHT 752 SH-2 (He-3, 2bar)
Specifications
Sensitivity> 30 keV
Certifications/ComplianceMeets IP 67 requirement for waterproofing; shock-resistence / NRPB approved (UK); ICRU 39 for SI-units
DescriptionSv/h display used w/calibrated probes
Energy RangeFH 40 G: 36 keV to 1.3 MeV; FH 40 G-L: 36 keV to 1.3 MeV; FH 40 G-10: 30 keV to 4.4 MeV; FH 40 GL-omega: 36 keV to 1.3 MeV
Product TypeDigital Survey Meter
Height (English)1.7 in.
Measured QuantityFH 40 G, FH 40 G-L, FH 40 GL-omega: Response (Roentgen) - R; FH 40 G-10: Ambient dose equivalent rate (H™(10)) - Sv
Width (Metric)7.4 cm
Weight (Metric)0.41 kg
Radiation TypeDependent on probe used
Depth (Metric)195 mm
Width (English)2.9 in.
Weight (English)0.9 lb.
Depth (English)7.7 in.
Height (Metric)4.2 cm
Dose RangeFH 40 G: 10 µR - 1000 R; FH 40 G-L, FH 40 GL-omega: 10 µR - 100 R; FH 40 G-10: 100 nSv - 10 Sv
Unit SizeEach