Honeywell AQS 51-KAM, AQS 61-KAM DATASHEET

GENERAL

The AQS51-KAM and AQS 61-KAM sensors/controllers for duct mounting measure the carbon dioxide (CO2) concentration and the temperature in the return or outside air. They are used in ventilation and air conditioning systems to control the amount of fresh outside air being supplied to the occupants for acceptable indoor air quality and to reduce unnecessary conditioning of outside air during lowoccupancy periods.

This Demand Controlled Ventilation (DCV) is a cost effective solution to conserve energy and to ensure that the fresh outside air supplied is no more than is necessary to meet the actual requirements of the occupants at any given time.

The sensors/controllers offer separate 0(2)...10Vdc or 0(4)...20mA outputs for CO2 and temperature and in addition a digital ON/OFF relay output with switching hysteresis for alarm or other purposes.

The UART interface (RS232) for serial communication allows a PC to be connected in order to perform maintenance checks or reconfigurations during normal operation. If used as a controller, each of these outputs can be configured to

AQS51/61-KAM

COMBINED CO2-/TEMPERATURE DUCT SENSOR/CONTROLLER

PRODUCT DATA

provide a more complex ventilation strategy based on a mixture of CO2 plus temperature measurements and to assign a number of functions, including hierarchy.

For this analog output configuration, the software program STRATEGY is available, which is part of the User Interface Program Software package AQS-USP22 used for recalibration, change of the measurement range or other service or set-up purposes.

The switching setpoint and differential of the relay output for CO2 limit monitoring or plant/system ON/OFF control can be adjusted within the measurement range. This output can be used also as automatic fire threshold to switch off ventilation, when CO2 levels exceed normal limit of e. g. 2500 ppm in case of fire.

FEATURES

•CO2 measurement range 0...3000 ppm corresponding to 0...0.3% CO2. Factory-calibrated 0...2000 ppm

•Multifunctional unit for temperature and CO2- measurement or control

•State-of-the-art Non-Dispersion-Infrared (NDIR) technology to measure carbon dioxide gas

•Automatic drift correction (ABC-algorithm) based on a long term evaluation provides typical zero drift check maintenance-intervals of up to 5 years

•Standard output signals 0(2)...10 Vdc or 0(4)...20 mA each for CO2 and temperature measurement or control

•Programmable mixed controller signal output(s) provides ventilation control strategies to match exactly the application requirements

•Digital ON/OFF relay output for CO2 limit monitoring

•RS232 interface for configuration, parameter setting or data exchange with a PC using Windows 95/98

•User interface program on diskette for service, recalibration and change of measurement ranges

•Optional with 4-digit LCD display with the selectable indication of:

•- CO2 and room temperature alternating

-Error code

-CO2-concentration (ppm)

-Temperature (°C)

-Analog Output1

-Analog Output2

® U.S. Registered Trademark				EN0B-1023 GE02R0700
Copyright © 2000 Honeywell Inc. • All rights reserved

AQS51/61-KAM COMBINED CO2-/TEMPERATURE DUCT SENSOR/CONTROLLER

MODELS

		Type	Order Number
	CO2	and Temperature Duct	AQS51-KAM
	Sensor without LCD display
	CO2	and Temperature Duct	AQS61-KAM
	Sensor with 4-digit LCD display

ACCESSORIES

	Description	Order Number
	Service Software; 3.5” Diskette
	(for changing the sensing range, the	AQS-USP22
	parametrization and the post calibration)
	Testset
	(consists of a portable gas generator for	AQS-F0005
	zero-position calibration, pump, packing,
	3m tube, battery and transformer)
	RS Cable with built-in electronics and	AQS3/4 or
	adapters	AQS31/41

TECHNICAL DATA

		Power supply	24Vac ± 20%; 50/60Hz or 24Vdc ± 20%
		Power consumption	2W
		Sensor life expectancy	>15 years
		Maintenance interval	5 years
	General	Self diagnostics	Complete power/sensor/analog outputs internal test
		Status LED indication	Yellow = Maintenance required; Red = Relay activated
		Power-up time	≤1 min
		Ambient operating limits
		- Temperature	0...50°C
		- Humidity	0...95%rh (non condensing)
		Operating principle	Non-dispersive infrared (NDIR)
		Gas sampling mode	Diffusion and 3 mm gas inlet push-on barb
		Response time	2 min (diffusion) or 10 sec (0.2 ltr/min gas flow)
		Measurement range	0...3000 ppm
	CO2 - Measurement	Converting range	0...2000 ppm = 0...10 Vdc (factory setting)
			or 2...10 Vdc / 0...20 mA / 4...20 mA
		Accuracy	±1% of measurement range, ±5% of reading
		Pressure dependence	+1.58% of reading per kPa deviation from normal pressure
			100 kPa
		Annual zero drift	< ±1% of measurement range
		Operating principle	Thermistor
	Temperature	Measurement range	−10...60°C
			0...50 °C = 0...10 Vdc (factory setting) or 2...10 Vdc / 0...20
	Measurement	Converting range
			mA / 4...20 mA
		Accuracy	±0.2 K
		Settings and configuration with
		Service Software AQS-USP22
	+	- Throttling range CO2	100...800 ppm
	P I control	- Throttling range temperature	1...10 K
		- Reset time adjustment ranges	2...500 sec (factory setting: 300 sec)

EN0B-1023 GE02R0700

2

AQS51/61-KAM COMBINED CO2-/TEMPERATURE DUCT SENSOR/CONTROLLER

		Output signal	0...10 Vdc / 2...10 Vdc, impedance 100 Ω
			or 0...20 mA / 4...20 mA, load ≤500 Ω
		Resolution	10mV (10Bits)
		D/A conversion accuracy	±2% of output voltage, +0.1 V
	Analog outputs		±2% of output current, ±0.3 mA
		Protection	PTC fuse (auto reset), short-circuit proof
			Both outputs can be configured to any sensor mix (CO2 +
		Customization of P+I controller	temperature + digital input of 5 proportional ranges with
			priorities and offsets, using the PC software STRATEGY,
			Version 3)
		Single pole, double throw	1A/50 Vac (50VA) or 1 A / 24 Vdc (30 W)
	Digital relay output	(SPDT) switching, potential free
		contact.	Relay activated: ≥1000 ppm
		Factory adjusted switching	Relay deactivated: ≤900 ppm
		setpoint and differential
	Dimensions	Sensor housing	(84 x 142 x 46) mm
		Sampling probe	203 mm
			Toggles between the following 6 display modes on
	Zigzag traces		the 4-digit display:
	(accessible after		- CO2 and temperature alternating
	removing the cover)	MENU Zigzag traces	- Error code
	Shortage with a		- CO2 in ppm
	screwdriver simulates		- Temperature in °C
	pushing of push button		- Analog output 1
			- Analog output 2

DIMENSIONS

84

46

203

42

09

1 24

25

5

55

Fig. 1 Dimensions in mm

EN0B-1023 GE02R0700