Several Honeywell MIDAS® cartridges can be configured to read a number of different gases based on a common chemical family. Actual details for the sensor detection range are included in the sensor cartridge specification sheet and the MIDAS® technical manual. MIDAS® sensor cartridges can be ordered as part of a Kit with the universal MIDAS® transmitter, or as a replacement part. The detectable range is listed. With the exception of O2 (where ambient concentration is typically 20.9%), the sensors will display zero when no gas is present. All Cartridges with the format MIDAS-E-XXX are supplied with a 2 year (24 month) warranty.
| Gas Measured | Nitric Oxide (NO) |
| Cartridge Part Number | MIDAS-E-NOX | 2 year extended warranty |
| Sensor Technology | 3 electrode electrochemical cell |
| Measuring Range (ppm) | NO | 0 – 100 ppm |
| Minimum Alarm 1 Set Point | 12.5 ppm |
| Repeatability | < ± 2% of measured value |
| Linearity | < ± 5% of measured value |
| Response Time t62.5 | < 15 seconds |
| Sensor Cartridge Life Expectancy | ≥ 24 months under typical application conditions |
| Operating Temperature | 0°C to +40°C (32°F to 104°F) |
| Effect of Temperature | < ± 0.09ppm / °C (0°C to 30°C) |
| Zero | < ± 0.17ppm / °C (30°C to 40°C) |
| Sensitivity | < ± 0.5% of measured value / °C |
| Operating Humidity (continuous) | 15 – 90% rH |
| Effect of Humidity | Zero | No effect |
| Sensitivity | < ± 0.5% of measured value / % rH |
| Operating Pressure | 90 – 110kPa |
| Effect of Position | No effect in typical application |
| Long Term Drift | Zero | No Drift |
| Sensitivity | < 2% of measured value / month |
| Calibration Gas | Nitric Oxide (NO) |
| Challenge Gas (Bump Test) | Nitric Oxide (NO) |
| Warm Up Time | < 10 minutes |
| Storage Temperature | +5°C to +25°C (+41°F to +77°F) |
Cross Sensitivities
Each Midas sensor is potentially cross sensitive to other gases and this may cause a gas reading when exposed to other gases than those originally designated. The table below presents typical readings that will be observed when a new sensor cartridge is exposed to the cross sensitive gas (or a mixture of gases containing the cross sensitive species).
| Gas / Vapor | Chemical Formula | Concentration applied (ppm) | Reading (ppm NO) |
| Carbon Monoxide | CO | 300 | 0 |
| Hydrogen Sulfide | H2S | 15 | 1.5 |
| Nitrogen Dioxide | NO2 | 5 | < 1.5 |
| Sulfur Dioxide | SO2 | 5 | 0 |
Front Panel 5U Controller includes HMI, PCBs, SD Card
1 × $6,511.00 