Yokogawa Single Channel Oxygen Analyzer System ZR22/ZR402 User Manual
Page 31
IM 11M12A01-03E
2-12
Contact Output: Four points, contact capacity 30V DC 3A, 250V AC 3A
(resistive load).
Three of the output points can be selected to either normally energized or
normally de-energized status.
Delayed functions (0 to 255 seconds) and hysteresis function (0 to 9.9 vol% O
2
can be added to high/low-alarms.
The following functions are programmable for contact outputs.
(1) Abnormal, (2) High-high alarm, (3) High-alarm, (4) Low-low alarm, (5)
Low-alarm, (6) Maintenance, (7) Calibration, (8) Range switching answer-back,
(9) Warm-up, (10) Calibration-gas pressure decrease (answerback of contact
input), (11) Temperature high-alarm, (12) Blowback start, (13) Flameout gas
detection (answerback of contact input), (14) Calibration coefficient alarm, (15)
Startup power stabilization timeout alarm
Contact output 4 is set to normally operated, and fixed error status.
Converter Input: Thermal input one point (4 to 20 mA DC)
Contact Input: Two points, voltage-free contact inputs
The following functions are programmable for contact inputs:
(1) Calibration-gas pressure decrease alarm, (2) Range switching (switched
range is fixed), (3) External calibration start, (4) Process alarm (if this signal is
received, the heater power turns off), (5) Blowback start
Contact capacity: Off-state leakage current: 3 mA or less
Self-diagnosis: cell abnormal , cell temperature abnormal (low/high), calibration
abnormal, A/D converter defective, digital circuit defective
Calibration:Method; zero/span calibration
Calibration mode; automatic, semi-automatic and manual (All are operated
interactively with an LCD touchpanel). Either zero or span can be skipped.
Zero calibration-gas concentration setting range: 0.3 to 100 vol% O
2
(minimum
in 0.01 vol%).
Span calibration-gas concentration setting range: 4.5 to 100 vol% O
2
(minimum
in 0.01 vol%).
Use nitrogen-based mixed gas containing about 10% of oxygen for standard
zero-gas, and 80 to 100 % of oxygen for standard span-gas.
Calibration period; date/time setting: maximum 255 days