Analog Output Function - Oval ALTI mass CA00A Instructions Manual

L -- 740 -- 28 -- E

9.13 Analog Output Function

The transmitter is provided with two analog outputs which can be assigned to "mass flow", "volume flow",
"temperature", "density" and "drive output". The setup procedure is outlined below:
(1) Setup procedure
By reconfiguring the following five parameters, outputs that suit your particular application are made
available.
① Output assignment (Assign) (See 9.2.4 Transition chart (3) [No. 2-4-1-1] and [No. 2-4-2-1].)
Types of measurement are selected.
・Mass Flow:
・Vol Flow:
・Density:
・Temp:
・Drive Output: Drive output
When assignments are modified, reconfigure upper limit, lower limit, low flow cutoff, and damping
factor to values that best suit your application.
② Upper limit value (URV) (See 9.2.4 Transition chart (3) [No. 2-4-1-2] and [No. 2-4-2-2].)
The lower limit of analog output can be changed; a 4mA output is produced when the preset
value is reached. Values outside the maximum range (※1) and smaller than the lower limit value
are unacceptable, however.
③ Lower limit value (LRV) (See 9.2.4 Transition chart (3) [No. 2-4-1-3] and [No. 2-4-2-3].)
The upper limit of analog output can be changed; a 20mA output is produced when the preset
value is reached. Values outside the maximum range (※1) and larger than the upper limit value
are unacceptable, however.
④ Low flow cutoff (Lowcut) (See 9.2.4 Transition chart (3) [No. 2-4-1-4] and [No. 2-4-2-4].)
The low flow cutoff of analog output (%) can be changed. When the low flow cutoff value is
larger than the proportion of analog output － where the upper limit is set to 100% and the lower
limit is 0% － the analog output becomes 4mA. Acceptable setting range is from 0% to 10%.
⑤ Damping factor (Added Damp) (See 9.2.4 Transition chart (3) [No. 2-4-1-5] and [No. 2-4-2-5].)
Damping constant of analog output (sec) can be changed. Select a larger value when analog
output fluctuates excessively; select a smaller value when fast response is desired.
Acceptable setting range is from 0 to 200 (sec).
⑥ The state of analog output in an error (Analog) (See 9.2.5 Transition chart (5) [No. 2-4-6-1].)
・Downscale: 2.4mA is output.
・Zero: 4mA is output.
・Hold: Analog output immediately before an error is maintained.
・Upscale:
(For details of outputs in an error, see 10.1 Error Messages.)
※1 Maximum range
Instant mass flowrate:
Instant volume flowrate: － Max. allowable range/0.3 to max. allowable range/0.3
Temperature:
Density:
CAUTION: When measurement-related unit set up at Assign is modified, the
upper and lower limit values will be converted automatically to the
measures to read in the unit selected.
10
NOTE:
Instant mass flowrate
Instant volume flowrate
Density
Temperature
21.6mA is output.
－ Max. allowable range to max. allowable range
Max. temperature range of sensor
0.0 to 5.0
For this function, the setting change is disabled in
Write Protect mode (refer to section 9.2).