Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 - Manual (Page 131)

IM 11M13A01-02E 8-14
8.5 Input Contact Settings
8.5.1 Input Contact Functions
The converter input contacts execute set functions by accepting a remote dry-contact
(“voltage-free contact”) signal. Table 8.7 shows the functions executed by a remote
contact signal.
Table 8.7 Input Contact Functions
Item Function
Calibration-gas pressure While the contact signal is on, neither semi-automatic nor
drop automatic calibration is possible.
Measuring range change While contact input is On, range of Analog Output 1 is switched to
0-25% O 2 and "Range" is displayed on the screen. See Figure 8.10.
Calibration start If the contact signal is applied, semi-automatic calibration
starts (only if the semi-automatic or automatic mode has been
setup). Calibration is started with an applied one second or more
time interval single-output contact signal. Even if a continuous
contact signal is applied, a second calibration is not repeated. If
you want to perform calibration, turn the contact signal off and
then back on.
Process upset If the contact signal is on, heater power will be switched off.
(A one or more second time interval single-output signal is
(Unburnt gas available as a contact signal.) If this operation starts, the sensor
detection) temperature decreases and an error occurs. To restore it to normal,
turn the power off and then back on, or reset the analyzer.
Blowback start If the contact signal is on, blowback starts. (A one second or more
time interval single-output signal is available as a contact signal.)
Even if a continuous contact signal is applied, a calibration is not
repeated. If you want to make a second calibration,
turn the contact signal off and then back on. (Refer to Section 10.2,
"Blowback")
T8.7E.EPS
Tag:
21.0
%O2
7.35mA -Output1
7.35mA -Output2
Range
F8.10E.EPS
Figure 8.10 Changing Measuring Range with Input Contact
Note
1. Measurement range switching function by an external contact input is available for
analog output1 only.
2. When making a semi-automatic calibration, be sure to set the semi-automatic or
automatic mode using the Calibration setup display.
3. When carrying out “blowback,” be sure to set “blowback” in the output contact setup.
4. When the unburnt gas detection signal is sent to the contact input, the converter will
cut the power supply to the heater of the detector. As a result, the heater temperature
becomes low and Error 1 or Error 2 happens.