Various sensor products
NAP－78A
NAP-78A is a gas sensor for monitoring incomplete combustion. 78A can be installed in a flue duct for direct monitoring on stoking equipment. Usually this type of sensor has individual temperature dependency to require an individual compensation circuit, but this has been the cause of the high cost of such sensors to eventually impede the popularization, however, 78A’s temperature dependency can be compensated by a simple circuit and does not need an individual circuit.
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| Structure & appearance of NAP-78A |
Ratings
| Item |
Specifications |
| Supply voltage |
DC 2.0 +/- 0.1V
AC 2.0 +/-0.1V (r.m.s. 50~60Hz) |
| Heat cleaning voltage |
DC 2.75 +/- 0.1V
AC 2.75 +/- 0.1V (r.m.s. 50~60Hz) |
| Heat cleaning cycles |
1 min. only upon switch-on |
| O2 concentration |
1 ~ 21％ |
| CO/H2 |
1/1 ~ 1/4 |
| Current (When2.0V is applied) |
DC140 ~ 160mA
AC140 ~ 160mA (r.m.s. 50~60Hz) |
| Ambient temperature |
In operation 0 ~ +200℃
In storage -10 ~ +50℃ |
| Ambient humidity |
In operation 95％RH or less
In storage 99％RH or less(No dew condensation) |
Gas sensitivity characteristics
| Gases and concentration |
Output voltage |
| Output in clean air |
+8.0 ~ +12.0 mV |
| CO 1000ppm + H2 500ppm |
6 - 7mV (Normal Temp.), 4 - 5mV (200℃) |
| Temperature dependency at Zero point |
Zero point variation +/- 1.0mV or less between normal temperature and 200℃ |
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| Gas sensitivity characteristics |
Circuit for fixtures |
