Manual

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 [phone]
F [phone]
Mirion Technologies (MGPI) Inc
5000 Highlands Parkway
Suite 150
Smyrna, GA 30082
USA
T [phone]
F [phone]
Mirion Technologies (MGPI H&B) GmbH
Landsberger Strasse 328a
DE-80687 Munich
Germany
T [phone]
F [phone]
Mirion Commercial (Beijing) Co., Ltd.
Shanghai Jiangchang Commercial Branch
Room 801, 78 Jiangchang SanLu
Zhabei District, Shanghai 200436
PR of China
T [phone]
F [phone]
DSK/DMK 250
Neutron Flux Instrumentation
www.mirion.com
144969EN-C
DETECTORS AND INPUT SIGNALS
● Miniature in-core  ssion chambers, e.g. WL 23630
(IST), MNK/MBK 61 (Siemens-Areva)
● Cable to the DSK 250: coaxial cable, no limitation of
length
● Detector supply: -50 ... -200 V individually
adjustable for each detector
● Range of detector current: 32 ... 4000 μA adjustable to
full scale
● Input signal for coolant  ow: 0/4 ... 20mA
DIGITAL SIGNAL PROCESSING
● 80C31 multi-processor system
● Program memory: EPROM
● Parameter memory: CMOS-RAM with integrated
Li-battery
● Data interface: RS232 and/or RS485
● Internal LC-display: 2 x 16 characters
● DSK 250 processes four detector signals in four
individual signal paths:
○ Calibration of detector signal to power density
○ Alarm threshold for local density in relation to coolant
 ow
● DMK 250 accumulates up to 64 detector lines (16
DSK 250):
○ Calculation and calibration of average reactor power
○ Calculation of  ow related  ux and margin to scram
○ Flux oscillation monitoring combining transient sup-
pression and fast response
OUTPUT SIGNALS
● DSK 250:  ux density for each detector position
● DMK 250:
○ Average  ux
○ Flow related  ux
○ Magnitude of  ux oscillations calibrated to reactor
power, e.g. 0 ... 125 %Pn
● Analog outputs: 0/4 ... 20mA/600 Ω, insulated
● Binary outputs: insulated relay change overs,
60V/0.5A or 125V/1A
OTHER CHARACTERISTICS
● DC power supply: 18 ... 33 VDC, approx. 1.6A at 24 V
(each DSK and DMK)
● 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)
DSK 250
front view