5.42 Square root mode
Display: SQrt
Range: on or OFF
Default Value: OFF
Square root - selects the square root scaling to on or OFF. When set to on a square root function
is applied to the input. When set to OFF the calibration is a linear function. When the square root
facility is used the scaled displayed value follows the square root of the percentage of the full scale
input value. The upper and lower input limits are set as normal as are the values to be displayed
at these limits.
Note: It is essential that the display is rescaled, using CAL1 and CAL2 or USER En4 and USER
En20, whenever the square root function is turned on or off. The CAL OFSt function cannot
be used when the SQrt function is set to on. Example:
For a 4–20mA input if you wish to display 0 at 4mA and 1000 at 20mA the square root function
will calculate as follows:
At 20mA (100%) the display will be 1000 i.e.
√
1 × 1000.
At 16mA (75%) the display will be 866 i.e.
√
0.75 × 1000.
At 12mA (50%) the display will be 707 i.e.
√
0.5 × 1000 and so on.
5.43 Alarm relay operation mode
Display: A1, A2 etc.
Range: LiuE, tARE, P.HLd, d.HLd, Hi, Lo or dISP
Default Value: LiuE
Alarm relay operation mode for relays 1, 2 etc. The following choices are available for alarm
operation mode:
LiuE - live input mode. The alarm relay operation will always follow the electrical input at that
time irrespective of the 7 segment display value. e.g. assume the remote input is set to tARE and
A1Hi is set to 100. If the instrument is tared at a display reading of 30 then the alarm will now
activate at a display reading of 70. Note that if a remote input or P button ZERO operation
has been carried out the above example does not apply i.e. for the above if the display was zeroed
rather than tared at a display of 30 then the relay will still activate at a display of 100, this is
due to the fact that the zero operation permanently shifts the live calibration.
tARE - tare mode. The alarm relay operation will follow the tare function. e.g. in the example
above (dISP) if A1 is set to tARE then the alarm would activate at a display reading of 100
(the setpoint value) rather than 70.
P.HLd - peak hold mode. If the peak hold mode is used and the remote input is set to peak
hold (P.HLD) then once the peak display goes above any alarm high setpoint the alarm relay will
activate and will not de-activate until the peak hold is released and the display value falls below
the setpoint value.
d.HLd - display hold mode. If the display hold mode is used and the remote input is set to display
hold (d.HLd) then the alarm relay will be held in its present state (activated or de-activated) until
the display hold is released and the display is free to change.
Hi - peak (max.) memory mode. If the peak memory mode is used and the remote input is set to
peak memory (Hi) then the alarm will be activated if the peak memory value is above the high
setpoint value. The alarm will not de-activate until the memory is reset.
34 of 56 PM4IVMAN-2.4-0
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