1. TECHNICAL INFORMATION CONCERNING THE DOSE RATE METER 6150AD

The instrument has a built-in GM counter and additionally provides a probe socket to connect external probes. If a probe is connected, the internal counting tube is automatically turned off; the detector of the probe is now measuring. The type of the probe is automatically recognized (e.g. display "ext 17" when a 6150AD-17 probe is connected). Display range and units are chosen automatically according to the type of the probe. Also, there is no fixed assignment between probe and instrument. That means you may connect any probe with any 6150AD, where probe indication will not depend on the 6150AD in use. One pin of the probe socket serves as serial interface and can be used to transmit and evaluate the display (dose rate) of the instrument on a PC. Cables to connect external probes may be up to 100 m long (depending on probe type). Standard lengths available from stock are 1.25 m, 3 m, 10 m, 20 m, 75 m, and 100 m.

The basic 6150AD models are 6150AD1 to 6150AD6, henceforth generally designated as “6150ADn” (where n stands for 1 to 6).

Models 6150AD1/3/5 have the same range of up to 1 Sv/h. They only differ in number and extent of functions, that is in software (EPROM). The 6150AD3 was the more intelligent successor of the 6150AD1. The 6150AD5 is again the successor of the 6150AD3 with additional support for the scintillator probe 6150AD-b. Likewise, models 6150AD2/4/6 have a range of up to 10 mSv/h, where the 6150AD4 was the more intelligent successor of the 6150AD2, and the 6150AD6 again corresponds to a 6150AD4 with additional support for the scintillator probe. In that sense models 6150AD1 to 6150AD4 are outdated (but are still available, particularly the models 6150AD1 and 6150AD2 for those users who prefer easier operation of a simple model). The following Table 1 summarizes all models 6150AD1 to 6150AD6 with their essential features.
 

Table 1
6150AD model summary

	range up to	additional functions	supports probe 6150AD-b
6150AD1	1 Sv/h	no	no
6150AD3		yes
6150AD5			yes
6150AD2	10 mSv/h	no	no
6150AD4		yes
6150AD6			yes

The additional functions comprise: protection against unintentionally switching off, non-volatile storage of the dose measured with the internal tube, dose alarm, programmable alarm thresholds for dose and dose rate, better resolution (more places after the decimal point) when indicating dose, alarm threshold, and so on.

Unless stated otherwise, 6150AD and probes are designed for photon dose equivalent (rate) Hx. Models designed for ambient dose equivalent (rate) H*(10) get the suffix “/H” or “/E” to their type name. The only difference between “/H” and “/E” models is their compatibility with probes (seeTable 2 below). “/E” models of the probes and “/E” models of the 6150AD only work among each other. “/H” models work among each other and with Hx models. For example, a 6150AD5 works with a probe 6150AD-18/H. Using that 6150AD5 without a probe yields Hx, whereas connecting the 6150AD-18/H probe yields H*(10). The other way round, a 6150AD5/H works with a probe 6150AD-18. In that case, the 6150AD/H yields H*(10), whereas connecting the 6150AD-18 probe yields Hx. “/H” models of probes and meter offer the advantage that they remain compatible with older Hx meters and probes. “/E” models are recommended in case you want to force the 6150AD's indication to H*(10) even when working with external probes. However, this will require your possibly existing Hx equipment to be upgraded to “/E” models if it shall be used together with the new “/E” equipment. Note that the difference between Hx and H*(10) is not very great except at low photon energies, see section  Products/Radiation Quantities and Units for more information on that subject.
 

Table 2
Compatibility of 6150AD meter and probes

Probe	Meter
	6150ADn, 6150ADn/H	6150ADn/E
Sievert probes neither /H nor /E models (i.e., for Hx)	yes	no
Sievert probes /H models (i.e., for H*(10))	yes	no
Sievert probes /E models (i.e., for H*(10))	no	yes
Pulse rate probes (s-1)	yes	yes

for photon radiation (gamma- and X-radiation), with analog and digital display, automatic range switching, non-volatile dose memory, individually programmable dose and dose rate alarm thresholds, indication of relative standard deviation, including 9V-battery (IEC 6LR61).
Analog range: 1 µSv/h - 1000 mSv/h
Digital range: 0.1 µSv/h - 999 mSv/h
Energy range 6150AD5: 45 keV - 3 MeV
Energy range 6150AD5/H, 6150AD5/E: 45 keV - 2.6 MeV
- Hx model (compatible with all probes except /E models): 6150AD5
- H*(10) model (compatible with all probes except /E models): 6150AD5/H
- H*(10) model (compatible with pulse rate probes and /E probes): 6150AD5/E

for photon radiation (gamma- and X-radiation), with analog and digital display, automatic range switching, non-volatile dose memory, individually programmable dose and dose rate alarm thresholds, indication of relative standard deviation, including 9V-battery (IEC 6LR61).
Analog range: 0.1 µSv/h - 10 mSv/h
Digital range: 0.01 µSv/h - 9.99 mSv/h
Energy range: 60 keV - 1.3 MeV
- Hx model (compatible with all probes except /E models): 6150AD6
- H*(10) model (compatible with all probes except /E models): 6150AD6/H
- H*(10) model (compatible with pulse rate probes and /E probes): 6150AD6/E

high dose rate probe for photon radiation (gamma- and X-radiation), power supply from 6150AD.
Analog range: 0.1 mSv/h - 10 Sv/h
Digital range: 0.01 mSv/h - 9.99 Sv/h
Energy range: 65 keV - 3 MeV
- Hx model (compatible with all meters 6150ADn and 6150ADn/H): 6150AD-15
- H*(10) model (compatible with all meters 6150ADn and 6150ADn/H): 6150AD-15/H
- H*(10) model (compatible with 6150ADn/E meters only): 6150AD-15/E

low dose rate probe for photon radiation (gamma- and X-radiation), power supply from 6150AD.
Analog range: 0.1 µSv/h - 10 mSv/h
Digital range: 0.01 µSv/h - 9.99 mSv/h
Energy range: 65 keV - 1.3 MeV
- Hx model (compatible with all meters 6150ADn and 6150ADn/H): 6150AD-18
- H*(10) model (compatible with all meters 6150ADn and 6150ADn/H): 6150AD-18/H
- H*(10) model (compatible with 6150ADn/E meters only): 6150AD-18/E

for photon radiation (gamma- and X-radiation), plastic scintillator 3" x 3", power supply from 6150AD, including helical probe cable.
Analog range: 10 nSv/h - 100 µSv/h
Digital range: 1 nSv/h - 99.99 µSv/h
Energy range 6150AD-b: 23 keV - 7 MeV
Energy range 6150AD-b/H, /E: 20 keV - 7 MeV
- Hx model (compatible with 6150AD5(/H) and 6150AD6(/H) meters): 6150AD-b
- H*(10) model (compatible with 6150AD5(/H) and 6150AD6(/H) meters): 6150AD-b/H
- H*(10) model (compatible with 6150AD5/E and 6150AD6/E meters only): 6150AD-b/E

Wipe test probe, compatible with any Dose Rate Meter 6150AD, power supply from 6150AD.
Analog range: 0.1 s^-1 - 10k s^-1
Digital range: 0.01 s^-1 - 9.99k s^-1

for liquids, compatible with any Dose Rate Meter 6150AD, power supply from 6150AD.
(production has been discontinued)

large area counting tube for alpha-, beta- and gamma-radiation, compatible with any Dose Rate Meter 6150AD, power supply from 6150AD. Including fixed probe cable.
Analog range: 0.1 s^-1 - approx. 40k s^-1
Digital range: 0.01 s^-1 - approx. 40k s^-1

for beta radiation and photon radiation (gamma- and X-radiation). Two counting tubes, auto-ranging between low dose rate and high dose rate counting tube. Telescope extendible to a length of approx. 4 m. Power supply from 6150AD. Including fixed probe cable.
Analog range: 0.1 µSv/h - 10 Sv/h
Digital range: 0.01 µSv/h - 9.99 Sv/h
Energy ranges:
low dose rate counting tube: 65 keV - 1.3 MeV
high dose rate counting tube: 65 keV - 3 MeV
- Hx model (compatible with all meters 6150ADn and 6150ADn/H): 6150AD-t
- H*(10) model (compatible with all meters 6150ADn and 6150ADn/H): 6150AD-t/H
- H*(10) model (compatible with 6150ADn/E meters only): 6150AD-t/E

for storage of one Dose Rate Meter 6150AD, with particularly well noticeable audible and optical alarm when exceeding the adjustable dose rate alarm threshold. Dose rate measurements by 6150AD or probe connected to 6150AD (6150AD not included). Suitable for wall mounting, including lead accumulator, power supply 87-250VAC / 50 Hz.

for storage of one Dose Rate Meter 6150AD with possibility to connect up to 10 probes of the 6150AD-family (6150AD not included). Selection of probe channel at Multiplexer or via connected PC. Recording and graphic representation of the channels on PC (standard software included). Suitable for wall mounting, power supply 87-250VAC / 50 Hz.