A Cryogenic Programmable Intelligent Temperature Controller

MercuryiTC

Compatible with all magnet systems, the MercuryiPS is an intelligent, fully configurable magnet power supply for our superconducting magnets.

Temperature Measurement

Measures and controls temperatures to below 250 mK with a precision of 0.1 mK supporting all standard cryogenic sensors.

Pressure Measurement

A pressure sensor card can be added which can be used to control cryogen flow via the Auxiliary gas control cards.

Auxiliary Card

Auxiliary cards can be added into the MercuryiTC. A variety of optional temperature inputs, heater outputs, pressure transducer inputs and stepper motor drives can be configured.

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Features

Measures and controls temperatures to below 250 mK with a precision of 0.1 mK (24 bit A to D resolution).
Heater output up to 80 W per channel.
Software switchable between true constant voltage source or current source for sensor excitation, preventing self-heating and allowing for high quality measurements at the lowest temperature.
Supports all standard cryogenic sensors (ruthenium oxide, cernox, silicon diodes, platinum, thermocouple and RhFe).
Base system includes a single temperature sensor input and 80 W heater output for precise temperature PID control.
Easy pc connection to your Mercury instrument via multiple remote ports.
The MercuryiTC has also a number of pre-configured control modes e.g., Heliox control, Lambda Fridge control, Rotator control, etc.
Rear panel connections.

Detailed Specifications

Thermometry Heater Configuration Options Control Pressure Reading Cryogen Level Reading

Thermometry

Number of inputs: 1 included as standard, up to 8 extra
Sensor ADC Resolution: 24-bit
Maximum reading rate: Up to 4 readings per second
Isolation: All sensors independently isolated
Supported sensor types: All standard types of cryogenic RTDs (Resistance Temperature Detectors) plus diodes and thermocouples

Heater

Number of outputs: 1 incl. as standard, up to 3 extra
DAC Resolution: 16-bit
Max heater power: 80 W
Max current: 2 A
Max voltage: 40 V
Heater load range: 20 Ω to 2500 Ω
Heater noise (0 - 2 MHz): < 2 mV

Configuration Options

Sensor input: Up to 9
Heater output: Up to 4
N2 / He level meter: Up to 2
Auxiliary control (stepper motor): Up to 4
GPIB: 1

Control

Number of loops: 1 incl. as standard, up to 3 extra
PID control: Fixed or zonal
Set point: Programmable
Proportional gain: 0 to 200 K (resolution 0.1)
Integral time: 0 to 200 mins (resolution 0.001)
Derivative rate: 0 to 300 mins (resolution 0.001)

Pressure Reading

Number of inputs: Up to 4
Sensor ADC Resolution: 24-bit
Maximum reading rate: Up to 4 readings per second
Voltage Ranges: 10 V, 1.6 V, 0.8 V, 0.4 V, 0.2 V, 0 – 0.1 V (Auto-ranging)
Current Ranges: 4 – 20 mA, 20 mA, 16 mA, 8 mA, 4 mA (Auto-ranging)
Absolute accuracy: ±0.1% full scale in each range
Sensor Excitation Voltage: 0 V(off) , 10 V ± 5% or 15 V ± 5%
Sensor Excitation Current: 0 - 20 mA
Supported sensor types: Voltage, Current and Ratiometric

Cryogen Level Reading

Helium Level specifications:
- Excitation current settings: 20 mA to 280 mA in 20 mA steps
- Excitation current accuracy: ±5%
- Excitation voltage: 40 V maximum
- Probe resistance: 0 to 300 ohms
- Probe resistance accuracy: ±0.2%
- Probe resistance stability: ±0.1%
- A/D Resolution: 24-bit
- Reading rate: 1 sample every 10s or 1 sample every 30 minutes
- Isolation: All sensors independently isolated

Number of cards: Up to 2
Each card supports a Helium Level input and a Nitrogen Level input
Nitrogen Level input
- Probe source voltage: 12 VDC
- Probe source oscillator frequency range: 5 kHz to 90 kHz
- Probe sensing resolution (level): 0.1%
- Probe sensing accuracy (level): 0.5%