YOKOGAWA ZR22S, User Manual

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<8. Detailed Data Setting>
8-12
8.5 Contact Input Setting
8.5.1 Contact Input Functions
The converter “Input contacts” execute set functions by accepting a remote dry-contact (“voltage-
free contact”) signal. Table 8.8 shows the functions executed by a remote contact signal.
Table 8.8 Contact Input Functions
Item Function
Calibration gas pressure low Contact input disables Semi-automatic or Automatic Calibration.
Measuring range change
While Contact signal is ON, range of mA-Output 1 is switched to 0-25 vol%O
2
and “Range” is displayed on the screen. See Figure 8.9.
Calibration start Contact input starts Semi-Automatic Calibration. Calibration Mode setting must
be [Semi_Auto] or [Auto]. Contact signal must be applied for at least 1 sec.
Even if input signal continues to be applied, calibration is not repeated unless
contact input is released then reapplied.
Process upset
(Combustible gas detection)
If the Contact signal is ON, heater power will be switched off. (A one- to
11-second time interval single-output signal is available as a contact signal.) If
this operation starts, the sensor temperature decreases and an error occurs.
To restore it to normal, turn the power off and then back on, or reset the
analyzer.
Blow back start Contact input starts Blow back. Contact signal must be applied for at least 1
sec. Even if input signal continues to be applied, Blow back is not repeated
unless contact input is released then reapplied. (Refer to Section 10.4, Blow
Back.)
Tag:
21.0
%O
2
7.35mA -Output1
7.35mA -Output2
Range
F08-9E.ai
Figure 8.9 Changing Measuring Range with Contact Input
CAUTION
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 blow back, be sure to set “Blow back” in the “Contact setup”.
4. When the combustible 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.
IM 11M13A01-02E