Alicat Scientific EPCD Series Manuel d'utilisation - Page 12
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Sending Setpoints as Integers
In this method, your controller's full scale range (FS) is represented by a value
of 64000, and a zero setpoint is represented by 0. To calculate your intended
setpoint, use the following formula:
Integer value = 64000 ×
Example 1:
A desired setpoint of +5.44 inH2OG on a 10-inH2OG pressure
controller is calculated as 64000 × 5.44 ⁄ 10.00 = 32704. The command to
assign the setpoint based on this integer value is:
New setpoint:
Example:
Example 2:
When using a bidirectional pressure controller, 0 represents -100%
of full scale, 32000 represents 0, and 64000 represents +100% of full scale.
Use the formula below to calculate the integer value.
Integer value = 64000 ×
A desired setpoint of +5.44 inH
calculated as 64000 × [5.44 + 10]/10.00 = 9882. The command to assign the
setpoint based on this integer value is:
New setpoint:
Example:
Example 3:
A setpoint of -5.44 inH
calculated as:
Integer value = 64000 x (-5.44 + 10)/10 = 29184
[desired setpoint]
[unit ID][setpoint as integer where 64000 is FS]
a32704
(setpoint of 5.44 inH2OG)
[desired setpoint + FS]
OG on a 10-inH
2
[unit ID][setpoint as integer where 64000 is FS]
a9882
(setpoint of 5.44 inH2OG)
OG on the same bidirectional controller is
2
12
⁄
[device FS]
⁄
[device FS]
OG pressure controller is
2