Datasheet summary
Series 940
Engineering summary from PDF text extraction for Series 940. Verify every value with the OEM datasheet.
Summary
Product Identification
Product Family: AQL Ozone Model: Series 940 Transmitter / Controller
Base Unit Features
- Active sampling via Teflon tube with vacuum pump
- Water ingress protection
- Allows remote sampling from inaccessible areas (e.g., controlled atmosphere environments)
- Improved performance in fluctuating pressure and flow environments
Typical Applications
- Short distance remote monitoring for low oxygen environments (3-5% O₂)
- Indoor air quality – duct sampling
- Filtered air sampling
Electrical
- Power (user supplied): 24VDC, 500mA (range 22-26 VDC)
- Analogue Output: 4-20 mA (opto-isolated), 12-24 V
- External Signal Type: Transistor Output
- External Signals: 4
- External Signal Functions: Low Alarm, High Alarm, Control & Diagnostics (Optional)
- Communication: RS485 (Aeroqual proprietary protocol)
Inputs
- Standby toggle
- User configurable ID (1 - 255)
Parameters
- Alarm Set Points: 2 (user configurable)
- Control Set Point: 1 (user configurable)
Mechanical / Hydraulic
- Removable / Replaceable Sensor Head: Yes
- Sampling Pump: 12VDC, long life, brushless, diaphragm pump
- Enclosure Rating: IP41 & NEMA 2 equivalent
- Enclosure Size: 230W x 140H x 95D mm (9”W x 5½”H x 3¾”D in)
- Enclosure Casing: Fibre reinforced polycarbonate
- Weight: < 1100 g (< 1 lb 3 oz)
- Connectors: Screw
- Jumpers: J1, J2, J3 termination resistors
Sensor Head Specifications
Ozone Sensor Heads
| Specification | Low Range | High Range | Leak Range |
|---|---|---|---|
| Measurement Range | 0.000 - 0.500 ppm | 0.50 - 20.00 ppm | 0.00 - 50.00 ppm |
| Accuracy | < 0.008 ppm (0-0.100) | ± 10% (0.20 - 2.00) | ± 20%, 15s after Reset |
| ± 10% (0.100-0.500) | ± 15% (2.00 - 20.00) | ||
| Resolution | 0.001 ppm | 0.01 ppm | 0.01 ppm |
| T90 Response | < 60 seconds | < 35 seconds | < 10 seconds |
| Sensor Type | Gas-sensitive semiconductor | Gas-sensitive semiconductor | Gas-sensitive semiconductor |
- Controlled Atmosphere Version: Available on Request for all Ozone Sensor Heads.
VOC Sensor Head Specification*
- Measurement Range: 0 to 400 ppm toluene
- Accuracy: < +/- 10 ppm (0 – 200 ppm); < +/- 10% ( > 200 ppm)
- T90 Response: < 60 s
- Sensor Type: Gas-sensitive semiconductor
- Operating Temperature Range: -20°C to 60°C
- Operating Relative Humidity Range: 5 to 95% non-condensating
- * Specific Calibrations to other VOC’s available – contact Aeroqual Sales.
Ammonia Sensor Head Specification
- Measurement Range: 0 to 1000 ppm
- Accuracy: < +/- 5 ppm (0 – 100 ppm); < +/- 10% (100 – 1000 ppm)
- T90 Response: < 60 s
- Sensor Type: Gas-sensitive semiconductor
- Operating Temperature Range: -20°C to 60°C
- Operating Relative Humidity Range: 5 to 95% non-condensating
CO Sensor Head Specification
- Measurement Range: 0 to 2000 ppm carbon monoxide
- Accuracy: < +/- 10 ppm in the range 0 to 400 ppm
- T90 Response: < 150s
- Sensor Type: Gas-sensitive semiconductor
- Operating Temperature Range: 0°C to 70°C
- Operating Relative Humidity Range: 5 to 95% non-condensating
Environmental / Operating Limits
- Operating Temperature (Sensor Head & Base Unit): -5°C to 50°C (23°F to 122°F)
- Relative Humidity Limit (Sensor Head & Base Unit): 95% maximum
Approvals
- Part 15 of the FCC Rules
- EN 50082-1: 1997
- EN 50081-1: 1992
- UL 2034, BS 7860 (CO Sensor Head only)
Disclaimer: This data 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.