Wide Range Analog Module

Type: RNL-04.02

Detector: fission chamber

Measuring range: 1 to 106 pps (pulse); 10-8 to 3.16*10-6 Arms (AC)

Neutron flux measurement in source and intermediate ranges

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-04.02 type Wide Range Analogue module is the more intelligent version of RNL-04.01. It has RS 422 serial I/O interface, supporting simple connection to Neutron Flux Data Processor.

The RNL-04.02. Wide Range Analogue Module is used for the measurement of currents from fission chambers. It serves for the measurement of the neutron flux in the source and intermediate range. The signal of the fission chamber gets to the input of the preamplifier. It amplifies the measuring signal and splits it into pulse and AC components. These signals are separately amplified in the pulse and multirange AC amplifiers. The stepping type range switching is accomplished by automatic or manual manner, depending on the state of AUT/MAN signal. In manual state the range is controlled by RANGE UP or RANGE DOWN binary signals. The TG0…TG2 test generators are controlled from TEST ON input. If this level goes high, a test signals are switched to the amplifiers sequentially.

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 Ranges 1 to 106 pps (pulse)
10-8 to 3.16*10-6 Arms (AC)

Frequency Outputs
RS 422A

Pulse Ch. Output
AC Channel Measurement Ranges 10    3.16*10-6 Arms
9     1.78*10-6 Arms
8     1.00*10-6 Arms
7     5.62*10-7 Arms
6     3.16*10-7 Arms
5     1.78*10-7 Arms
4     1.00*10-7 Arms
3     3.16*10-9 Arms
2     3.16*10-8 Arms
1     1.78*10-8 Arms
0     1.00*10-8 Arms

Serial I/O
RS 422A

HV Setting & Monitoring
Discr. Setting & Mon.
Range & Test Control
Pulse & AC Outputs Mon.
Internal Test Generators TG0   15,63/500 kHz
TG1   1,563/500 kHz
TG2   0,5 V/25 kHz

Analogue Outputs
0/4 to 20 mA

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

High Voltage 0 to +800 V/ max. 3 mA Communication Protocol ANSI
Response time 1 s (adjustable)
Accuracy ± 5 %


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)