YOKOGAWA EXAxt ZR22G, User Manual, Page: 34 / 211

<2. Specifications>
2-15
IM 11M12A01-02E 16th Edition : Mar. 19, 2020-00
Contact Related Items: Selection of contact input 1 and 2, selection of contact output 1 to 4
(abnormal, high-high alarm, high alarm, low alarm, low-low alarm,
maintenance, calibrating, range switching, warming-up, calibration gas
pressure decrease, temperature high alarm, blow back, flameout gas
detection, calibration coefficient alarm, stabilization timeout)
Converter Output: Two points mA analog output (4 to 20 mA DC (maximum load resistance
of 550 Ω)) and one mA digital output point (HART) (minimum load
resistance of 250 Ω).
Oxygen analyzer; Range: Any setting between 0 to 5 through 0 to 100 vol%O
2
in
1 vol%O
2
, or partial range is available (Maximum range value/
minimum range value 1.3 or more). For the log output, the
minimum range value is fixed at 0.1 vol%O
2
.
4 to 20 mA DC linear or log can be selected. Input/output
isolation provided.
Humidity analyzer; Range: any setting between 0 to 5 through 0 to 100 vol% O
2
, 0 to
25 through 0 to 100 vol% H
2
O, 0 to 0.200 through 0 to 1.000 kg/
kg or partial range is available.
For the log output, the minimum range values are fixed at 0.1
vol% O
2
for the oxygen concentration, 0.1 vol% H
2
O for the
moisture quantity, and 0.01 kg/kg for the mixture ratio.
4 to 20 mA DC linear or log can be selected. Input/output
isolation provided.
Output damping: 0 to 255 seconds.
Hold / non-hold selection, preset value setting possible with hold.
Contact Output: Four points, contact capacity 30 V DC 3 A, 250 V AC 3 A (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
,0 to 9.9 vol%H
2
O, 0.000 to 0.010 kg/kg) 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
(answer-back of contact input), (11) Temperature high alarm, (12) Blow
back start, (13) Flameout gas detection (answer-back 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 contacts
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) Blow back start
Contact capacity: Off-state leakage current: 3 mA or less
Self-diagnosis: Abnormal cell, abnormal cell temperature (low/high), abnormal
calibration, defective A/D converter, defective digital circuit
Calibration:
Method; zero/span calibration
Calibration mode; automatic, semi-automatic and manual (All are operated interactively
with an LCD touchscreen). Either zero or span can be skipped.
Zero calibration gas concentration setting range:
0.3 to 100 vol%O
2
(in increments of 0.01 vol%O
2
in smallest units).