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An error state (for example, echo is lost for at least 3 minutes) may be represented by one of the
following electrical currents:




22mA
3.6mA (or 3.8mA in some models)
Holding the most recent good value
3.6mA or 22mA, the one nearest to the most recent legal value
Pressing any keypad button will cause the current to jump 22mA regardless of the 4-20 error settings.
The current will return to represent measurement as soon as the device resumes normal measurement
Setup may be performed using the keypad or by PC configuration. Each is described in the appropriate
chapter of this user manual.
The reader is further advised to review the interdependencies section in the PC configuration chapter.
(b) 4-20 Performance
When Gauger420 is fed by low current, the performance of the system is modified to accommodate for
the available electrical power. In particular, the rate of ultrasonic pulse transmissions is decreased. This
decrease means that Gauger420 response to rapidly moving targets is reduced. At low current and low
voltage the pulse rate may be four times lower than the maximum rate.
(c) 4-20 constraints
4-20 settings must be configured after settings of Full and Empty levels. Once Full and Empty levels are
configured, 4-20 settings are modified to their default values. For other constraints related to 4-20
setting please refer to the Interdependencies section.
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GaugerGSM/485 – User Manual
page 122 of 126
May 2014 Rev 4.4