Datasheet summary
SM 50
Engineering summary from PDF text extraction for SM 50. Verify every value with the OEM datasheet.
Summary
Product Identification
Aeroqual SM50 OEM Ozone Sensor Module
Software Options
Two software options are available:
- Switching Device: For simple on/off switching of equipment. (Not installed)
- Control Device: Maintains a specific gas concentration between user-defined levels by controlling external devices via the on-board relay. (Installed)
Software is loaded prior to delivery and can only be altered by returning to Aeroqual Limited.
Ozone Sensors
| Sensor | Calibrated Range | Accuracy | Resolution | 0-5V Analog Output |
|---|---|---|---|---|
| Ozone ultra low (OZU) | 0 - 0.150 ppm | <± 0.010 ppm | 0.001 ppm | 0 - 0.150 ppm |
| Ozone low (OZL) | 0 - 0.5 ppm | <± 0.02 ppm (0 - 0.1 ppm) | 0.001 ppm | 0 - 0.5 ppm |
| <± 20% (> 0.1ppm) | ||||
| Ozone high (OZH) | 0.5 - 20 ppm | <± 20% | 0.01 ppm | 0 - 20 ppm |
Operating Instructions
Relay Set Point Configuration
The Relay and Alarm Set Point is factory set by default, but can be adjusted using dip-switches. The table below shows example set points for different ozone sensor types.
| Relay dipswitch (1 2 3 4) | O₃ Ultra-Low (ppm) | O₃ Low (ppm) | O₃ High (ppm) |
|---|---|---|---|
| on on on on | 0.000 | 0.000 | 0 |
| off on on on | 0.010 | 0.025 | 1 |
| on off on on | 0.020 | 0.050 | 2 |
| off off on on | 0.030 | 0.075 | 3 |
| on on off on | 0.040 | 0.100 | 4 |
| off on off on * | 0.050 | 0.125 | 5 |
| on off off on | 0.060 | 0.150 | 6 |
| off off off on | 0.070 | 0.175 | 7 |
| on on on off | 0.080 | 0.200 | 8 |
| off on on off | 0.090 | 0.225 | 9 |
| on off on off | 0.100 | 0.250 | 10 |
| off off on off | 0.110 | 0.300 | 12 |
| on on off off | 0.120 | 0.350 | 14 |
| off on off off | 0.130 | 0.400 | 16 |
| on off off off | 0.140 | 0.450 | 18 |
| off off off off | 0.150 | 0.500 | 20 |
* Default factory setting
Status LED / Diagnostics
- Startup: Flashes green 2-6 times at 0.5-second intervals.
- Warm-up (3-10 minutes): Flashes green at 2-second intervals.
- Normal Operation: Solid green.
- Sensor Failure: Flashes green rapidly at 0.3-second intervals.
Relay LED
Glows red when the gas concentration reaches the "Relay-Set-Point" and the relay is activated.
Using the Relay Output
The relay has volt-free contacts (NO, NC, COM) rated for a maximum of 30V / 2A. For higher loads, an external relay is required.
- Normally Open (NO) Relay: Closes when the set point is reached, activating the external device. Switches off when the concentration drops below the set point. Fail-safe if power fails.
- Normally Closed (NC) Relay: Opens when the set point is reached, deactivating the external device. Switches on when the concentration drops below the set point. Not fail-safe.
Operation as a Control Device
This mode requires specialized software loaded at the factory. The SM50 maintains gas concentration within a "dead band" (± 10% of the set point).
- When concentration rises from below the "Lower Limit" to the "Upper Limit", the relay remains closed.
- When concentration falls from above the "Upper Limit" to the "Lower Limit", the relay remains open.
Electrical
- Input Power: 11 - 24 VDC
- Power Consumption: 2.5 - 6 W max
- Analog Output: 0-5V, 12-bit resolution.
Mechanical / Hydraulic
- Board Size: 60 mm x 75 mm
- Mounting: Screw or extrusion slot.
- Fan: Onboard ball-bearing, 50,000 hours life.
- Sensor Filter: Onboard.
Options
- Display: LCD (3.5 digit) or VFD (2-line/8-column) on separate boards.
- Piezo Alarm: Onboard or loose.
- Communication: RS232 or RS485 (onboard option).
- Temperature Sensor: Range -40 to 120 ºC, Accuracy ± 0.3 ºC, Resolution 0.01 ºC.
- Humidity Sensor: Range 0 to 100% RH, Accuracy ± 2% RH, Resolution 1% RH.
Environmental
- Operating Temperature: 0 to 50 ºC (or -20 to 50 ºC if enclosed).
- Operating Humidity: 5 to 95% RH (non-condensating).
Warranty
1 year limited warranty (excludes calibration).
Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.
Official datasheet (PDF)
Curated from selected public technical reference material for discovery and preliminary comparison. This summary is not a substitute for a current certified manufacturer datasheet. Verify revisions and design limits before use.