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Description,  technical data, measuring principle

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Your specialists for non-contact measurements

As experts in non-contact measurement methods, we offer a variety of different detector types to cover a wide variety of applications, measurement ranges or process conditions.

Product specification

Measuring probes for use in radiometric measuring systems

Description

RGI  Industriemessgeräte GmbH uses both classic counter tubes, such as the SBM 19, and modern crystal or plastic scintillators.

The  detectors of the ADxx, DDxx, FDxx, LDxx, MDxx, NRDxx, PDxx, RDxx and WDxx series essentially differ in their geometrical dimensions and their designation due to their use for different applications:



ADxx --> Ash content measurement
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DDxx -->  Density measurment
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FDxx -->  Moisture measurement
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LDxx --> continuous and point detection level measurement
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MDxx --> Mass measurement
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MDPxx --> Mass measurement
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NRDxx --> RMA 54 (truck-scanner)
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PDxx --> Potash content measurment
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RDxx --> RMA 54 (truck-scanner)
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WDxx --> conveyor belt weigher
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Details

Comparisons  of sensitivity, operational reliability and service life among the different detection methods clearly speak for the scintillation method.

Therefore,  all detectors of the ADxx, DDxx, FDxx, LDxx, MDxx, NRDxx, PDxx and WDxx series are equipped with scintillators.

In  design, construction and mode of operation, these detectors are based on the use of NaJ-crystals.

Only  the MDPxx, NRDxx and RDxx series detectors are equipped with plastic scintillators.

The  operation of these detectors is the same as for the detectors with NaJ-crystal scintillator.

The  measuring probes of the ADxx, DDxx, FDxx, LDxx, MDxx, MDPxx, NRDxx, PDxx, RDxx and WDxx series were developed as intensity detectors with high sensitivity for radiometric measurements in harsh, industrial environments.

They  are housed in a waterproof stainless steel housing (IP 67) for use in aggressive, industrial environments and for their protection.

The detectors are preset at the factory for the radiation to be detected, so other versions are available on request.

The  electronics of the scintillation detectors of the ADxx, DDxx, FDxx, LDxx, MDxx, MDPxx, NRDxx, RDxx, PDxx and WDxx series have an automatically resetting thermal fuse that responds to overcurrent (I> 500 mA).

If the fuse is tripped, the detector is approx. 1 min. after switching off the operating voltage U, ready for operation again.

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Measuring principle

In order to detect or measure radioactive radiation, its ionizing effect on other substances can be used, i.e. it has to be absorbed, whereby the denser the material, the higher the absorption.

There  are gas-filled ionization chambers (so-called Geiger-Müller tubes), which are among the oldest detectors for ionizing radiation, which due to the low density of gas - the pressure inside such tubes is lower than the air pressure at sea level - but especially with low radiation are too insensitive.

NaJ  crystals or their plastic counterparts, on the other hand, are much more sensitive and absorb more radioactive radiation due to the high density of the material.

Technique

The  structure and thus the functional principle of all detectors are largely the same:

The  incoming ionizing radiation generates light flashes in the detector when absorbed, which in turn are caused by the so-called s.g. Photomultipliers are registered and processed and evaluated as counting pulses by appropriate electronics.

The  entire detector must be installed in a mechanical protective and light-tight housing and be stabilized against interference.

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Technical data

(most common detectors, others on request)

● Operating voltage (V): min. 15.0 / nom. 24.0 / max. 30.0
● Current consumption (mA at UV = 24V): 150
● Output (V): 7.0
● Voltage impedance (Ω): 50
● Pulse rates (Imp / s): min. 500 / nom. 20000 / max. 60000
● Temperature range (° C): -20 ... +50
● Temperature change (K / h): 5
● NAJ (TL) scintillation crystal 50 x 50 mm
● Dimensions (Lx∅, mm): 217x210 (flange) / 158 (housing)

The  DD 50 is also available in a special housing version as a submersible probe.
Due to a special cover screw connection, protruding parts were avoided, which is why it is ideally suited for installation in pipes.

● Operating voltage (V): min. 15.0 / nom. 24.0 / max. 30.0
● Current consumption (mA at UV = 24V): 150
● Output (V): 15.0
● Voltage impedance (Ω): 50
● Pulse rates (Imp / s): min. 20 / nom. 20000 / max. 80000
● Temperature range (° C): -20 ... +50
● Temperature change (K / h): 5
● Scintillation crystal NAJ (TL) 125 x 10 mm
● Dimensions (Lx∅, mm): 260x70

● Operating voltage (V): min. 15.0 / nom. 24.0 / max. 30.0
● Current consumption (mA at UV = 24V): 150
● Output (V): 15.0
● Voltage impedance (Ω): 50
● Pulse rates (Imp / s): min. 10 / nom. 1000 / max. 60000
● Temperature range (° C): -20 ... +50
● Temperature change (K / h): 5
● NAJ scintillation crystal (TL, Lx∅, mm): 25x25
● Dimensions (Lx∅, mm): 260x70

● Operating voltage (V): min. 15.0 / nom. 24.0 / max. 30.0
● Current consumption (mA at UV = 24V): 150
● Output (V): 15.0
● Voltage impedance (Ω): 50
● Pulse rates (Imp / s): min. 20 / nom. 20000 / max. 80000
● Temperature range (° C): -20 ... +50
● Temperature change (K / h): 5
● Scintillation crystal NAJ (TL) 125 x 10 mm
● Dimensions (Lx∅, mm): 260x70

The  MDP 50 is also available in a special housing version as a submersible detector.
Protruding parts were avoided on this due to a special cover screw connection, which is why it is ideally suited for installation in pipes.

● Operating voltage (V): min. 15.0 / nom. 24.0 / max. 30.0
● Current consumption (mA at UV = 24V): nom. 150 / max. 350
● Output (V): 15.0
● Voltage impedance (Ω): 50
● Pulse rates (Imp / s): min. 200 / nom. 20000 / max. 60000
● Temperature range (° C): -20 ... +50
● Temperature change (K / h): 5
● Scintillation crystal polyvinyltoluene: 125 x 10 mm
● Dimensions (Lx∅, mm): 260x70

● Operating voltage (V, DC): min. 15.0 / nom. 24.0 / max. 30.0
● Current consumption (U = 24V, mA): 150
● Output voltage (V, pulses):
- PD 50 -> 15
- PD125 -> 7
● Impedance (Ω): 50
● Pulse rates (Imp / s):
- PD 50 -> min. 20 / nom. 300 / max. 5000
- PD125 -> min. 20 / nom. 1000 / max. 6000
● Temperature range (° C): -20 ... +50
● Temperature change (K / h): 5
● Scintillation crystal NAJ (TL) (mm):
- PD 50 -> 50 x 50
- PD125 -> 125 x 50
● Dimensions (Lx∅, mm):
- PD 50 -> 50 x 50
- PD125 -> 125 x 50

Counter  tubes of the type "SBM19" are permanently installed in the potash measuring device HAKAM 31:
The low-voltage Geiger-Müller counter tube "SBM-19" is used for the detection of hard β and γ radiation in radio technology devices.
It is therefore widely used in the field of radiation and smoke monitoring, in icing sensors and in fault diagnosis.

● Operating voltage (V): 400
● Working voltage (V): 260 ... 320
● Pulse slope (% / V): 0.1
● Sensitivity (µR / s): 0.001 ... 1
● Maximum count rate (Imb / s): 3000
● Natural background level (Nph, Imp / min): 120
● Sensitivity (γ radiation 137Cs source 3 μR / s, Imp / µR):
221.6 ... 273.5
● Pulse amplitude (V):> 50 V.
● Lifespan (number of pulses): ≥ 2x10¹⁰
● Overall dimensions:
- Diameter (mm) ≤ 19
- Length (mm) ≤ 125
● Weight (g) ≤ 25
● Ambient temperature (° C) -60 ... +70

That's what makes RGI products so special

User friendly

● simple, intuitive teaching
● retrofitting
● no contact with the material to be measured
● Measurement independent of:
- medium
- process conditions

Safety and quality

● Maintenance-free because there is no wear
● high operational reliability
● Long-term stable measurement
● Recalibration is not necessary
● Checks before delivery:
- Quality, climate and function

"Made in Germany"

● own development and production in Germany
● Use of high quality materials and components
● Use of proven technology
● Worldwide sales and on-site service by trained personnel

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You can get help and advice on the selection of the measuring system that best suits your application
from our experts in process measurement technology.

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