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AQ-Alert+ Air Quality Monitor - AQM Series

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• Supply voltage: 24Vdc ± 20%
• Current consumption: 250mA max
• Up to 3 analogue – voltage and/or current
• RS232 or RS485 (Modbus RTU)
• Up to 3 relays
• LEDs
• Buzzer

Model Number: AQM Series
Data Sheet:

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Product Specification

AQ-Alert+
Air Quality Monitor

The AQ-Alert+ is designed to monitor and control indoor air quality in the home, workplace and public areas, resulting in benefits such as improved comfort and health.

While most customers chose a monitor from our range of standard products, the configuration of the AQ-Alert+ may be defined by the user, making it ideally suited for use in a wide range of applications with varying requirements.

The AQ-Alert+ can be fitted with up to five different sensors and a variety of audio, visual, analogue, communications and relay outputs.

With the appropriate configuration, the AQ-Alert+ can operate in the following modes:

Stand Alone
The AQ-Alert+ monitors the air quality and alerts the occupant when a change in room conditions occurs.

Direct Control
The AQ-Alert+ monitors the air quality and directly controls ventilation, heating or air conditioning in order to maintain a preset range of room conditions. This can be via relays or analogue outputs.

Integration into a Building Management System
The AQ-Alert+ sends air quality information to another system that controls ventilation, heating or air-conditioning. Multiple units can be individually configured and used throughout an entire system.

Sensor Options
• Carbon dioxide
• Oxygen
• Temperature
• Relative humidity
• Atmospheric pressure

Applications
• Schools
• Offices
• Homes
• Public buildings

Output Options
• Up to 3 analogue – voltage and/or current
• RS232 or RS485 (Modbus RTU)
• Up to 3 relays
• LEDs
• Buzzer

Certified Standards
• EN50270:2006,
• RoHS compliant

Table 1 Maximum ratings

Parameter	Maximum ratings	Description
Supply voltage	24Vdc ± 20%	Optional mains adaptor available
Current consumption	250mA max	All possible sensor and output options fitted

Table 2 Sensor options and parameters

Sensor	Symbol	Range	Units	Description
Carbon dioxide	CO2	0 - 5000 0 - 10 000	ppm	Accuracy: ±70ppm, ±5% of reading (whichever is greater) Resolution: 1ppm
Oxygen	O2	0 - 25	%	Accuracy: ±1% vol.O 2 (after calibration in fresh air) Resolution: 0.01% vol.O2
Temperature	T	0 - 50	°C	Accuracy: ±2°C Resolution: 0.1°C
Relative humidity	Rh	0 - 95	%Rh	Non-condensing Accuracy: ±3% Resolution: 0.1%
Atmospheric pressure	P	750 - 1150	mbar	Accuracy: ±5mbar Resolution: 1mbar

Table 3 Output options and parameters

Output	Number	Options	Description
Analogue (current or voltage)	3	4 - 20mA 0 - 5Vdc 0 - 10Vdc 1 - 5Vdc	For current output, maximum load = 500Ω. For voltage output, minimum load = 10kΩ. Output range is directly proportional to the relevant sensor’s measuring range
Digital communications	1	RS232 RS485	Modbus RTU protocol For RS485, up to 32 devices on the same bus
Relay	3	37.5VA, 250Vac max	All three relays switch a common input Individual configurable switch points Standard hysteresis = 1% of the set switch point Normally open (NO) operation, user defines the sensor range/s when the relays are closed
LEDs	1	Traffic light warning sequence	Red, amber and green LEDs Configurable sensor activation thresholds Standard hysteresis = 1% of the set threshold Continuous and/or intermittent operation
Buzzer	1	70dB @ 4kHz	Configurable sensor alarm thresholds Standard hysteresis = 1% of the set threshold Continuous and/or intermittent operation

PART NUMBERING SYSTEM
Generate your specific part number using the system in Figure 1. Use only those letters and numbers that correspond to the sensor and output options that you need – omit those that you do not. Include ‘AQM-‘at the beginning of the part number. The configuration reference number defines how your customised AQ-Alert+ will behave and is allocated by SST.