Leak Detector System
CT Control Technology (India) Pvt. Ltd.
Mutual Inductance Type Leak Detector
and Electronics.
Leaders in Low Level Measurements
Document No. : 0515004 Rev A 05-15
Data Sheet
Features
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Product Overview
The Leak Detector System consists of MI Type Leak
Detector (MILD) and Electronics (MILDE).
The Leak Detector System is used to detect the Leak of
Sodium in double walled pipelines of Fast Breeder
Reactors, which uses liquid Sodium as coolant.
Highly Reliable
High Accuracy and Repeatability
LAN Interface
Individual Fail Safe Relay Contacts
Supports up to 16 channels
Dual LAN interface
Individual Trip Contacts for all channels
The MILDE is having 8 modules catering for 16 Channels.
The primaries of 2 detectors connected to one module, are
connected in series, with one excitation sourcing the
primary current. Individual signal conditioning is provided
for each secondary channel.
Market
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Nuclear Fast Breeder Reactor
Mutual Inductance Type Discrete
Level Probe and Electronics
Product Data Sheet, Part No. : 0515004 Rev A 05-15
The MILDE is having graphical display to indicate the status
of Level of all 16 Channels and fail safe Relay contacts. Also
MILDE is having dual LAN interface, to transfer all data to
main control room.
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PRODUCT DATA SHEET
Product Specifications
Probe Specifications
Electronics Specifications
Parameters
Specifications
Parameters
Specifications
Fluid:
Operating
Temperature:
Liquid Sodium
473 – 823K (200 - 550⁰C)
240VAC ±10% @ 50Hz
283 – 323K (10 - 50⁰C)
Bobbin Material:
Sensing Element
SS316L
MI (Mineral Insulated) Cable
Cable Diameter : 1mm
No. Of Core : 1
Core Material : Copper
Core Diameter : 0.33mm
>100MΩ
4 Pin62 IN Series Circular
Connector for Detector
6 Pin 62 In series for Relay
Power Supply:
Operating
Temperature:
No. Of Channels:
Excitation to Probe:
Insulation Resistance:
Interface:
Frequency Range:
Frequency Resolution:
Frequency Stability:
Constant Current Range:
Maximum Load
Resistance:
Line Regulation:
Load Regulation:
TC of Current:
Input Signal from Probe:
Input Impedance:
Level Indication:
Relay Contacts:
Response Time
Communication
Interface:
User Interface:
Enclosure:
Mutual Inductance Type Discrete
Level Probe and Electronics
Product Data Sheet, Part No. : 0515004 Rev A 05-15
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Constant Current at Constant
Frequency.
2KHz to 3KHz
1Hz
Better than 25PPM/⁰C
80 to 100mA
50 Ohm
Better than 0.1%
Better than 0.1% (for Load
Variation of 2 Ω to 50 Ω)
Better than 100PPM/⁰C
AC Signal < 6kHz, 5mV to 50mV
(rms)
>100 KΩ
On LCD and Dual LAN
2 Set of C/O Relay Contact for
each Set Point.
<1 Sec for all the Levels
Ethernet (Transmits Level and
other information)
128x64 Graphical LCD and 8x2
Keypad
EMI/EMC Compatible 3U
Height, 19” Rack Mountable
Instrument case
PRODUCT DATASHEET
Certifications
EMI/EMC Certifications
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Conducted Emission Test as per CISPR 11, Class A,2004
Radiated Emission Test as per CISPR 11, Class A, 2004
Radiated Susceptibility Test as per IEC 61000-4-3, 2006
Electrical Fast Transient Immunity Test as per IEC 61000-4-4, 2001
High Energy Surge Immunity Test as per IEC 61000-4-5, 2005
Conducted RF Immunity Test as per IEC 61000-4-9, 2001
Power Frequency Magnetic Field Immunity Test as per IEC 61000-4-8, 2001
Pulse Magnetic Field Test as per IEC 61000-4-9, 2001
Damped Oscillatory Test as per IEC 61000-4-12, 2001
Harmonics, Inter harmonics & Low Frequency Immunity Test as per IEC 61000-4-13, 2002
Variation of Power Frequency Immunity Test as per IEC 61000-4-28, 2002
Environmental Certifications
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Dry Cold Test as per IS 9000 Part II, Section 4
Dry Heat Test as per IS 9000 Part III, Section 5
Temperature Cycling Test as per IS 9000 Part XIV, Section 2
Damp Heat Test as per IS 9000 Part V, Section 1
Drop Test as per IS 9000 Part VII, Section 3
Mutual Inductance Type Discrete
Level Probe and Electronics
Product Data Sheet, Part No. : 0515004 Rev A 05-15
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PRODUCT DATASHEET
Principle of Operation
Principle of Operation
The Mutual Inductance type Leak Detector is working on the principle of variation of mutual inductance between
two windings when they are immersed in an electrically conducting fluid such as sodium. The sensing part of the
Leak Detector consists of one primary winding and one secondary winding. The probe is inserted in a stainless steel
pocket. The primary winding of the probe is excited by an AC constant current at a constant frequency. This
generates a magnetic field linking both windings. Hence an emf is induced in the secondary coil. Liquid Sodium
being a good electrical conductor, an emf will also be induced in the liquid Sodium. The liquid Sodium surrounding
the probe acts as a short circuited winding, inducing eddy currents to flow in it. The magnetic flux produced by the
eddy current will oppose the main flux produced by the primary winding. Hence the net flux linking the secondary
winding decreases thereby is reducing the secondary voltage; as the liquid Sodium Leak increases. Thus the
secondary voltage is an inverse linear function of Sodium Leak. When the sodium surrounds the windings, the
induced signal in secondary is minimum. When there is no sodium around the winding, the induced signal in the
secondary is maximum. The change in induced signal of the secondary is used for sodium Leak detection.
Sensing Element
The sensitive portion of the probe (bobbin) is made of SS316L. One layer of primary winding and two layers of
secondary winding are wound over the bobbin for each sensor coil. The primary windings are connected in series (all
primary windings will be wound in series during winding) and secondary windings are individual. The primary and
secondary windings are wound with 1mm dia, SS sheathed mineral insulated cable with copper conductor core.
Primary winding:
Number of turns
Number of layers
: 22
: 1
Secondary winding:
Number of turns
Number of layers
: 44
: 2 (22 turns per layer)
The insulation resistance between the windings and electrical ground shall be >100 MΩ at 20°C and the value of
insulation resistance shall be >1MΩ at 600°C. The voltage for insulation resistance measurement shall be 100V DC.
All the terminals of the windings are extended by cables with cold end pot and terminated in a terminal box at the
upper part of the Leak Detector. 62 IN series circular connectors (4 pins) are used for each Leak Detector and 6 Pin
connectors for relay contacts..
The nominal constant current input for primary is 100 mA ± 0.1 mA (typical) at the constant frequency of 2.50 kHz.
Secondary output is around 20mV (rms) without sodium and around 17mV (rms) when fully immersed in sodium
respectively, when the primary exited with current of 100mA (rms).
Mutual Inductance Type Discrete
Level Probe and Electronics
Product Data Sheet, Part No. : 0515004 Rev A 05-15
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PRODUCT DATASHEET
Product Drawing
Electronics Front View
Electronics Rear View
Probe Drawing
CT Control Technology (India) Pvt. Ltd.
Leaders in Low Level Measurements
th
#7, “SRISHTI”, Sharada Colony, 8 Main Road,
Basaveshwara Nagar, Bangalore – 560079, INDIA
Tel : +91 80-22740336/41279403
e-mail: ctindia@controltechnology.co.in
http://www.controltechnology.co.in
Mutual Inductance Type Discrete
Level Probe and Electronics
Product Data Sheet, Part No. : 0515004 Rev A 05-15
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