Handbook
November 2011 / 59-UMC0071 / Issue 01
Mercury iTC
Page 140
LEVEL-METER DAUGHTER BOARD
Original Instructions
13 If required, change the value displayed in the Pulse Counting Period (ms) field.
14 Tap Home to return to the Home page.
15 If required, access the Channel Display Configuration page and change the
displayed value from Pulse to N2 Level.
16.4 Specification of the level-meter board
Table 16-2 Environmental specifications of the level meter
Parameter Specification
Recommended ambient temperature 20°C to 30°C
Ambient temperature (with reduced performance) 0°C to 50°C
Altitude Up to 2000 m
Vibration Fixed laboratory installation
Table 16-3 Specification of the helium probe
Parameter Specification
Excitation current settings 20 mA to 280 mA in 20 mA steps
Excitation current accuracy ±5%
Excitation voltage 40 V maximum
Probe resistance 0Ω to 300Ω
Probe resistance measurement accuracy ±0.2%
Probe resistance measurement stability ±0.1%
Probe resistance ADC measurement resolution Better than 0.005%
Probe connections isolation to chassis >50 VDC
Table 16-4 Specification of the nitrogen probe
Parameter Specification
Probe source voltage 12 VDC
Probe source oscillator frequency range 5 kHz to 65 kHz
Probe sensing resolution (level) 0.1%
Probe sensing accuracy (level) 0.5%
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