Cooper Instruments & Systems PTT 260 Digital Pressure Sensor - Manual (Page 14)

CF 197 11 I&M011-10172 Rev A 5/11
In “Comparator setting mode”, user can change settings on the comparator outputs provided by the
unit. (Two comparator outputs or one for analog output unit are provided). The available selections of
this mode varies based on the selections made in Function setting mode and comparator output type
selection. For the unit provided with two comparator outputs, settings of each output can be done
independently with the exception of the operation mode.
• Hysteresis Mode
Settings of comparator operation point (A) and comparator operation point (b)
•Window Comparator Mode
Settings of comparator operation point (A) and dead band (b)
For operation points (A & B) setting, it is fixed at 1 %F.S. in the comparator OFF direction
(window comparator mode).
Also, as common parameters between each operation mode, comparator ON time delay and
comparator OFF time delay can be selected in the range of 0.00~2.00 seconds. Loop check
mode allows the user, without actually applying pressure to the unit, to vary pressure display
value by using key or key. As a result, comparator(s) and analog outputs will vary
based on the pressure display value chosen. This function allows the user to confirm outputs
or output settings manually. This function is also useful in checking proper wiring and other
simulations.
Comparator 1: Use/No Use
If the comparator 1 was set to No use, LED (OUT1) will turn off.
Comparator 2: Use/No Use
Only available with two comparators LED (OUT2) will turn off when comparator 2 is set to No Use.
Comparator Setting Point A & b
In case comparator 1 is disabled, this menu is not available. Only available with two comparator
option.
Note: When setting the dead band (b) in "Hysteresis", if the set value is too small, there is a risk of
chattering occurring. Be careful when setting dead band (b). For dead band (b), it is recommended
that a value greater than 1%FS of pressure range is selected.
Note: When the deadband (b) in “hysteresis” is set to negative, comparator is ON at low point (A) and
OFF at high point (A)
–(b).
Note: Comparator output setting values are checked and recalculated when a setting related to
comparator operation is altered in order to prevent any inconsistencies in comparator operation.
The comparator’s output setting value is recalculated, if the calculation result is beyond setting range
and the comparator output setting value will be changed automatically so that it will be within the
setting range. Possible calculated error of ±1digit may be observed at comparator output setting
values when the comparator output setting value is recalculated.
Comparator ON/OFF delay time
In case comparator 1 is disabled, this menu is not available.
Comparator 2 ON/OFF delay time
Only available with two comparator option.