Delta OHM HD2817T Series, Manual

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13. “Suspend” and “Off-line” functioning modes
The HD2817T... instruments have three different functioning modes:
1)
Standard functioning,
2) Suspend mode functioning,
3) Off-line mode functioning.
1) Standard mode
It is the normal functioning mode: continuous measurement, data logging, analog outputs, and
active relays...
2) “ Suspend” mode
The so-called suspend mode is mainly used to replace the probe without stopping the control
system. This state expires automatically after 60 seconds indicated by a beep, progressively
accelerated.
While this function is active, the instrument maintains the measurement and output (analog
outputs and relays) values at the moment of the suspension. Logging is interrupted and
resumed at the end of the suspension, with a new logging session.
When returning to normal state, the instrument will read the new probe calibration
parameters.
The “ suspend ” state allows replacement with a new probe, without causing anomalies or
alarms in the control system.
The suspension procedure is enabled from the menu item “MENU >> S tand-by >> Probe
Change ”. The suspension time can be extended 60 seconds by pressing the

arrow.
The time can be reduced to 3 seconds by pressing any key except the

arrow and ENTER.
The suspension procedure can also be started using the DeltaLog12 software.
From the PC you can also set the suspend time, if the standard one minute time is not enough.
Note: in order to provide reliable data, when performing the replacement, the new probe
should be thermally preconditioned in the measurement environment.
3) “ Off-line” mode
This state is the same as interrupting power to the instrument: the relays are de-energised,
the analog outputs are set to zero (0mA e 0V), and logging is stopped.
The Off-line procedure is enabled from the menu item “MENU >> S tand-by >> Off-line ”.
You can use the DeltaLog12 software to activate this mode.
To exit the
Off-line mode, hold down ENTER for about 10 seconds or use the special function of
the DeltaLog12 software.
WARNING: The Off-line mode is the same as interrupting power to the
instrument but does not entail physical disconnection from the mains. The
instrument remains under voltage: during each intervention on the system,
follow the normal security procedures that include disconnection from the
mains.