Thermo Scientific Micro-Tech 9101, Reference Manual

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Introduction
Optional Signal Outputs
Thermo Fisher Scientific Micro-Tech 9101/9201 Reference Manual, Rev J 1-17
Auto zero tracking (AZT) enables the belt scale system to automatically
zero itself during extended periods when the conveyor belt is running
empty. AZT does not actually change the Zero Number but applies a
factor to the Zero Number. AZT is menu selectable because some
installations may not need this option. A “Z” displays on the second line
of the display to indicate the selection of this option.
Under a preset minimum flow rate when enabled, the instrument makes
subsequent automatic zero calibrations with the following sequence.
1. Waits for one-half time of the test duration (a solid “Z” displays).
2. Execution of a zero test (the “Z” flashes).
3. Performs automatic zero for one test duration.
4. Continuously repeats above zero calibration as long as the feed rate
remains below AZT preset value. The Zero Tracking function is
limited to a maximum value of Deviation that is set as a percent of
full scale in the Setup scroll. If the new zero calculated by auto zero-
tracking function exceeds that value, an alarm is generated and the
new zero is not installed. The Zero Reference value for AZT is set
initially at the first zero calibration after cold start. An alarm is
generated when new zeros deviate too far from the Zero Reference
value. The Zero Reference value must be reset to clear these
deviation alarms.
An optional current output signal (0-20/4-20/20-0/20-4 mA) and an
optional dual channel current output/analog input board are available.
The choice of the signal type is made through the keypad. Each current
output may be programmed via the keypad to deliver one of the
following signals

Flow rate

Belt loading

Belt speed
Each output has its own adjustable damping and programmable time or
length delay.
Auto Zero
Tracking
Optional
Signal
Outputs