Knick Stratos MS A405 Series - HOLD Mode; Output Signal Response and Termination; External Activation of HOLD

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HOLD Mode
The HOLD mode is a safety state during conguration and calibration.
Output current is frozen (LAST) or set to a xed value (FIX).
Alarm and limit contacts are disabled.
HOLD mode, display icon:
Terminating the HOLD mode
The HOLD mode is exited by switching to measuring mode (hold meas key
depressed). The display reads “Good Bye“. After that, the HOLD mode is exited.
When the calibration mode is exited, a conrmation prompt ensures that the instal-
lation is ready for operation (e.g.: sensor reinstalled, located in process).
HOLD active
21
4
HOLD active
Output current
[mA]
Output signal for HOLD
FIX setting = 21.0 mA
Output signal for HOLD
LAST setting
Output signal during HOLD:
Output signal response
• LAST: The output current is frozen at its last value. Recommended for short
conguration procedures. The process should not change decisively during
conguration. Changes are not noticed with this setting!
• FIX: The output current is set to a value that is noticeably dierent from the
process value to signal the control system that the device is being worked at.
HOLD inactive 0...2 V AC/DC
HOLD active 10...30 V AC/DC
External activation of HOLD
The HOLD mode can be activated from outside by sending a signal to the HOLD
input (e.g., from the process control system).