Mirion Technologies DAK 250 User Manual
Featuring:
radiation monitoring
systems
A Mirion Technologies Division
DAK 250
Neutron Flux Instrumentation
DAK 250
Digital Start-up Channel
The DAK 250 digital start-up range channel forms
part of the proTK™ product line. It has been designed
for neutron ux monitoring in the pulse and inter-
mediate range in combination with pulse detectors,
e.g. BF3-counters and neutron ionization chambers.
Hardware and software of the DAK 250 are designed
and quali ed for applications at the level of the reac-
tor protection system.
APPLICATIONS
• Operational process monitoring
○ Safety related signal processing for neutron ux
monitoring in the pulse range (DAK 250-i) and
intermediate range (DAK 250-g)
RELATED PRODUCTS
• Neutron detectors: e.g. BF3-counters and
ionization chambers KNK/KNU 50
• Digital signal processing channels: e.g. for wide
range or power range monitoring
FEATURES
● Signal ltering with adaptive time constant
● Calibration to neutron ux signal (nv, P/Pn)
● Calculation of the ux change rate (reciprocal of the
reactor period)
● Generation of analog and binary signals for the reactor
protection system
● Linear and/or logarithmic analog outputs
● Remote test signal generators
● Optional: calculation of the reactor reactivity
Since norms, speci cations and designs are subject to occasional change, please ask for con rmation of the information given in this publication.
Mirion Technologies (MGPI) SA
Route d’Eyguières
FR-13113 Lamanon
France
T +33 (0) 4 90 59 59 59
F +33 (0) 4 90 59 55 18
Mirion Technologies (MGPI) Inc
5000 Highlands Parkway
Suite 150
Smyrna, GA 30082
USA
T +1 770 432 2744
F +1 770 432 9179
Mirion Technologies (MGPI H&B) GmbH
Landsberger Strasse 328a
DE-80687 Munich
Germany
T +49 (0) 89515 13-0
F +49 (0) 89515 13 169
Mirion Commercial (Beijing) Co., Ltd.
Shanghai Jiangchang Commercial Branch
Room 801, 78 Jiangchang SanLu
Zhabei District, Shanghai 200436
PR of China
T +86 21 6180 6920
F +86 21 6180 6924
DAK 250
Neutron Flux Instrumentation
www.mirion.com
144966EN-C
DETECTORS AND PREAMPLIFIERS
● Pulse detectors for DAK 250-i:
○ BF3- or He3-counter tubes
○ B10-proportional counters
○ Fission chambers in pulse mode
● Pulse preamplifi er NV 320:
○ Input and output impedance matched to the
impedance of the cables
○ Remote pulse generator for testing
● Ionisation chambers for DAK 250-g: compensated or
non-compensated
● Current-to-frequency-converter NV 102H: 10 decades
of measuring range
● Detector supply 0 ... 0.5/1/2/4 kV located in the
central electronic unit
DIGITAL SIGNAL PROCESSING
● 80C31/32 multi-processor system
● Program memory: EPROM
● Parameter memory: CMOS-RAM with integrated
Li-battery
● Data interface: RS 232 and/or RS 485
● Internal LC-display: 2 x 16 characters
OUTPUT SIGNALS
● Linear and/or logarithmic count rate or neutron ux
● Neutron ux change rate = 1 / reactor period to be
con gured, e.g. -1.25 ... 0 ... 12.5 %/s corresponding
to -80 ... ∞ ... +8 s reactor period
● Analog outputs: 0/4 ... 20mA/600 Ω, insulated
● Binary outputs: insulated relay change overs,
60V/0.5A or 125V/1A
● Optional: reactimeter on a single additional interface
board NK 21
OTHER CHARACTERISTICS
● DC power supply: 18 ... 33 VDC, approx. 1.6A at 24 V
● Optional: AC power supply: 230 VAC or 115 VAC
+10%/-15%, approx. 40 VA
● Operating temperature: 0 ... 70°C (32 ... 158°F)
for the main electronics
● Mechanical vibrations: < 5 g, 5 ... 100 Hz
● 19” modular system according to IEC 60297
● Rack size (W×H×D): 483 mm × 133 mm × 280 mm
(19 in x 5.2 in x 11 in)
● Plug-in boards: 100 mm × 160 mm (3.9 in x 6.3 in)
DAK 250
Schematic diagram
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