Stack Gas Krypton Monitor Type: KM709 manufactured by Nucleonix Systems is meant for use in areas where gaseous effluents from the stack are to be monitored for krypton activity.
This instrument uses state of art electronic devices & extensive embedded firmware to facilitate RS485 networking, printer connectivity, fault diagnostics etc., apart from general monitoring.
Modular construction of the sub-assemblies & trolley-mounted design make the equipment easy to maintain & use.

Specifications

Detector: Beta-Gamma GM counter tube
Type: 70031 (glass walled)
Make: Vacutec or equivalent
Operating Voltage: 450-500V
Gas filling: Neon, Halogen

No. of Detector Channels: 1 channel comprising of 1 GM detector

Detector Chamber:
Material: 4mm SS cylindrical chamber
Chamber dimensions: 20cm L x 14cm dia (Inner)
Inlet Valve: Inverted L shape pipe with a needle valve and a filter assembly. Serration extends the flow path by flexible hose.
Outlet Valve: L shaped pipe with a needle valve to control vacuum. Serration extends connecting path from the pipe by flexible hose.
Detector mounting arrangement: The top side of the chamber is closed with a provision for mounting the GM tube axially with proper gasket for arresting leaks.
Pressure Gauge: A pressure gauge for monitoring vacuum inside the chamber has been provided.
Cable length: 3 meters
Mounting: Provision to mount the chamber in the instrument trolley

ELECTRONIC UNIT:
I. Mini Bin & Power Supply (MB 403) : This unit is a compact Instrumentation bin with power supply built-in, powers all the modules of the system.
(a) MiniBin: Bin Connectors : Eight Connectors type 26-190-24 (Amphenol) wired in parallel for standard voltages.
Installed Wiring: All the Eight connectors are wired for +12V, -12V, +24V, +24V & -24V, and High quality GND.

Mechanical Dimensions: 11.75" Width X 11.00 depth upto connector plate X 8.75" height

(b) Power Supply:
D.C. Output: +12V @ 1A, -12V @ 1A, +24V @ 0.5A, -24V @ 0.5A.
Ripple & noise: Better than 3mV at full load for all the supplies.
II. High Voltage Unit (HV 501):
This is a High Voltage module which generates EHT in the range of 0 - 1500V, @ 1mA, used for biasing the PMT. Ripple & noise better than <=15mV.

III. COUNTING SYSTEM:
No. of counting: Dual counter channels
Display: 20x4 LCD display with LED backlight
Counting modes: Presetcount mode, CPM
Counting range: 0-999999 counts
Time constant for CPM: User settable from 10-99 seconds
Data Memory: 1000 readings
Storage of data: Automatic storage once preset levels are exceeded
Range: 5 characters for label, 999999 counts, RTC, 2 channels
RS485 port: For data transfer to remote host, RS485 port with MODBUS complaint firmware is provided
Current output: 4-20mA o/p is provided to drive a load of upto 600 ohms
Pulse height discriminator: Threshold value for input is set by means of a trimpot on PCB
Paralysis time: 250uS, 350uS, 550uS
Environmental conditions: 0oC to 50oC, Relative Humidity: Upto 70%
Instrument Trolley: A Trolley with roller castor wheels, which can accommodate measuring instrument & detector chamber will be provided