Source Range Analogue Module

Type: RNL-02.08

Detector: fission chamber

Measuring range: 10-1106 pps

Neutron flux measurement in source range

High voltage generator: included 

Computer interfacing: 

Multiline: analog and digital signals without intelligence.

RS 422 serial I/O

Powered from single power supply

The RNL-02.08 type Source Range Analogue module is the more intelligent version of RNL-02.07. It has RS 422 serial I/O interface, supporting the simple interfacing to Neutron Flux Data Processor.

The RNL-02.08. Source Range Analogue Module is used for the measurement of currents from fission chamber. It serves for the measurement of the neutron flux in the source range. The signal of the detector gets to the input of the preamplifier. The pulse signal is processed in an amplifier with amplitude discrimination. The adjustable discriminator suppresses background signals induced in the cable, electronic noise, and a radiation. This pulse signal will be processed in the range of 10-1 pps to 106 pps. The pulse frequency predivider serves to purpose of minimizing the statistical double pulse and dead time error. Threshold level can be controlled from potentiometer or from PIC. The input of the integral discriminator can be switched over to the output of TG1 test generator by remote controlled binary signal (TEST ON). 

The positive HV power supply is built up of encapsulated circuit. Both set-value control signal (HV+CNTR), and monitoring signal (HV+MON) are connected to RS 422 serial I/O lines.

The module is located in a double-shielded box out of the reactor vessel. It is built in massive brass housing to protect from electro-magnetic interference waves and cross coupling. This unit is installed isolated into additional die-cast aluminum housing. This insulated installation provides an additional protective screen. Maximum 200 m long cable ensures the electrical connection between the analog module and Neutron Flux Data Processor.

The primary supply of power enters the board. The unit also contains an isolation amplifier-current loop function to get the primary power monitoring signal (MON POWER S) output.

Main Technical Data

Analog Part Computer interfacing
Detector Fission Chamber

Digital Inputs
-33 to 8/13 to 72 V

Meas. Range Control
Test Control

Cable Capacity Max. 4 nF Digital Output
(relay contact)
Watch Dog
Measuring Range 1 to 106 pps 

Frequency Outputs
RS 422A

Pulse Ch. Output
Rate Meter Measurement Ranges 1 pps
3 pps
10 pps
3*10 pps

3*105 pps

106 pps.

Seial I/O
RS 422A

HV Setting & Monitoring
Discr. Setting & Mon.
Range & Test Control
Pulse  Output Mon.
Internal Test Generators TG0   15,63/500 kHz
TG1   1,563/500 kHz

Analogue Outputs
0/4 to 20 mA

Rate (direct)
Rate (D/A)
Range Monitor (D/A)
Power Supply Mon.

High Voltage 0 to +800 V/ max. 3 mA Communication Protocol ANSI
Response time 200 ms to 20 s (adjustable)
Accuracy 1%
External power 18 to 33 VDC / max. 30 W
Ambient temperature 0 to +60 oC
Relative humidity Max. 90%
Dimensions 300 mm x 160 mm x 90 mm (without external shielding box)
Mass 3 kg (without external shielding box)