Model PD690 Universal Process Meter
Instruction Manual
26
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Isolated 4-20 mA Transmitter Output Programming (
ovtpvt
)
The Isolated 4-20 mA Transmitter Output option can be programmed
without a calibrator. This option can be calibrated so that a 4 mA out-
put is produced for any number displayed by the meter. The 20 mA
output may be programmed to correspond to any number that is at
least 501 counts greater or smaller than the number corresponding to
4 mA. (Ex. 4 mA = 0, 20 mA = 501 or -501) If the span between 4 and
20 mA is less than 501 counts, an
error
message will appear and the
previously programmed values will be retained in memory until a
new set of values is accepted.
Setting 4 mA Output Value
1. Push
ENTER
, when
ovtPvt
appears push
ENTER
again.
2. All digits flash for 3 seconds, a green LED labeled "4" illuminates
indicating the flashing display is the value at which the meter will
produce a 4 mA output. Program desired value per
Five Basic
Digit/Display-setting Instructions on page 19.
Setting 20 mA Output Value
1. When
ENTER
is pushed to complete the programming for 4 mA
output, the green LED labeled "20" illuminates indicating the
flashing display is the value at which the meter will produce a 20
mA output.
2. Program desired value per
Five Basic Digit/Display-setting
Instructions on page 19.
3. An Error message will be displayed if the 4-20 mA output span is
smaller than 501 counts.
Programming Confirmation
The values that have been programmed to produce the 4 & 20 mA
outputs can be quickly checked to make sure they are the desired val-
ues. To do this, enter the
ovtPvt
routine by pushing
ENTER
and then
pushing
ENTER
again when
ovtPvt
appears.
The green "4" LED illuminates indicating the meter is displaying the
value at which it will produce a 4 mA output. Confirm that this is the
desired value. Push
ENTER
(within 3 seconds) before the entire dis-
play stops flashing and the green "20" LED illuminates indicating the
meter is displaying the value at which it will produce a 20 mA output.
Confirm that this is the desired value. Push
ENTER
(within 3 seconds)
before the entire display stops flashing and the meter returns to indi-
cation mode.
