RiKon-5-LNC Controller 772
Temperature and LN2 Controller
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The RiKon-5-LNC Controller 772 is designed for controlling the N2 level within the Liquid Nitrogen Cryostats RiKon-5-LNC and supplying the cryostat with fluid nitrogen.
A germanium diode AA118 is used as level sensor. A thermo resistor PT100 inside the RiKon-5 CEMS detector is used as temperature sensor.

FEATURES

  • Minimum temperature close to fluid N2 temperature (depending on technical features of the RiKon-5-LNC)
  • Maximum temperature approx. room temperature
  • Tree-(four-)wire connection to the thermo resistor for precise temperature measurement
  • DC output for the heating device inside the RiKon-5 CEMS detector
  • Built-in temperature control module EUROTHERM 3216 with many programmable functions
  • Setting temperature control parameters via push buttons at the front panel of the EUROTHERM module
  • Remote control by an optional software (setting temperature control parameters and reading measuring values) via RS 232C serial interface
SPECIFICATIONS
Input
From thermo resistor
(inside the RiKon-5 CEMS detector)
PT100 (see connector RIKON-5)
From level sensor
~ 0.7 V (room temperature) / >6 V (LN2 temperature) at a constant excitation current of 15 mA (see connector N2 LEVEL SENSOR)
Output
To heater (inside the cryostat)
24 V 300 mA (see connector RIKON-5)
To N2 valve
24 V 1 A (see connector N2 VALVE)
Connectors
POWER
Mains connection with 2 A slow fuse at rear panel
N2 LEVEL SENSOR
BNC connector for cable with N2 level sensor
N2 VALVE
Lumberg type SV 30, 3-pole connector for the cable to the magnetic valve for liquid N2 supply
RIKON-5
9-pin D-SUB connector for the temperature sensor and heater inside the RiKon-5 CEMS detector
REMOTE CONTROL RS 232 C
9-pin D-SUB connector for remote control via serial interface using optional software
Indicators
LCD display EUROTHERM module
Three color LCD display for clear indication of process variables with scrolling plain text message indication
N2 FILLING
Three-color LED indicating the current filling status:
 – red: manual N2 filling
 – yellow: automatic N2 filling enabled and N2 valve open
 – green: automatic N2 filling enabled and N2 valve closed
AUTO OFF ALARM
Red LED indicating that liquid N2 transfer has been interrupted (see AUTO OFF ALARM adjusting screw)
Audible signals
Beep with long pauses
N2 valve is open
(liquid N2 is transferred from dewar to RiKon-5-LNC)
Alarm (continuous tone)
Liquid N2 transfer has been interrupted (see AUTO OFF ALARM adjusting screw)
Controls
POWER
Front panel toggle switch for switching the unit on/off
at the front of the
EUROTHERM module
4 pushbuttons for programming temperature control parameters
N2 FILLING
 – MANUAL
 – OFF
 – AUTO
Three-position toggle switch for selecting the filling mode:
 – N2 filling enabled (momentary position)
 – N2 filling disabled (stable position)
 – Automatic N2 filling controlled by level sensor (stable position)
AUTO OFF ALARM
Adjusting screw for setting the maximum allowable N2 transfer time between 1 and 6 minutes
Physical
Housing
2 U - 19” metal housing (rack mounting set optional)
Dimensions
  445 mm
x 240 mm (290 mm with handles)
x  86 mm (100 mm with feet)
Weight
Approx. 6 kg
Power Requirements
Power supply voltage
100-250 VAC
Power consumption
< 100  VA