FH- 40G Series Portable Dose Rate Survey Meters

FH-40G Product Selection Chart

Specifications FH-40G Survey Meter

FH-40G Compatible Detectors

JRT Calibration Services

©JRT Associates 2008

• Gamma meter with internal proportional counter tube
• Versatile survey meter and area monitor available with a large number of external detectors
• Internal detector and external probes of the FH-40 G are monitored simultaneously
• Energy range 30 keV - 4.4 MeV [H*(10)]
• Comfortable to use
• Serial infrared interface
• Rugged and reliable
• Data logging
• Type tested for use by fire departments

The FH-40 G is rugged, lightweight, fits snugly in the palm of the hand and is easy to operate with large keys that enable users wearing gloves.

Internal diagnostics ensure proper functioning of the detector(s) and the electronics. If the battery voltage falls below a pre-defined value, an icon on the display flashes giving the user 20 hours of remaining use before replacing the batteries.

Alarm values are established for dose rate and integrated dose. When an alarm value is exceeded, an audible alarm is emitted. In parallel to the measured value display, an audible speaker can be activated to signal detector pulses.

The FH-40 G models are 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 barcode information.

The stored values can be read
directly from the LCD, accessed at any time and can also be processed and transferred for archiving to a PC via the FH-40 G serial interface.

All settings can be accessed and the data analysis can be done, using an optional Windows™-based PC software.

With the exception of the display instrument FH-40 G-X, all FH-40 G versions incorporate an energy-filtered proportional detector - no external probe or cable are required for gamma dose rate measurements. The internal proportional detector is always operational while an external detector is connected. The external probes utilized with either model
of FH-40 G are "smart" with the calibration parameters loaded automatically with a change of probes.

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.

Measured values are shown on a clear, backlit LCD display. Measure-ments are digital with a vertical 3 decade logarithmic bargraph.

An intelligent rate meter algorithm (ADF mode) detects and indicates small changes in dose rate, sup-pressing random noise. Additional information includes alarm setting(s),
audio speaker, battery voltage, external probe parameters,
date and time and many user-selectable functions.

A wide selection of External Detectors can be connected to FH-40 G with cable. Both values, from the external probe and the internal dose rate detector are simultaneously measured. For example:
neutron and gamma measurement, alpha/ beta contamination and dose rate, remote and local gamma dose rate, and local dose rate and 20 m under water.

Each detector is automatically identified by the FH-40 G and the correct parameters are set. For both values separate alarms can be set.

All external detectors are connected via a detector cable, with the exception of the Teleprobe FH-40 TG. All external detectors of the FH-40 G series are compatible with the FHT 6020 Display. Cable length may be up to 50 meters.