Honeywell AQS 51-KAM, AQS 61-KAM DATASHEET

AQS51/61-KAM

COMBINED CO2-/TEMPERATURE

DUCT SENSOR/CONTROLLER

PRODUCT DATA

GENERAL

The AQS51-KAM and AQS 61-KAM sensors/controllers for duct mounting measure the carbon dioxide (CO centration 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 CO 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

and temperature and in addition

) con-

provide a more complex ventilation strategy based on a mixture of CO 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

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 CO case of fire.

plus temperature measurements and to

levels exceed normal limit of e. g. 2500 ppm in

FEATURES

• CO2 measurement range 0...3000 ppm corresponding

to 0...0.3% CO

• Multifunctional unit for temperature and CO

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 CO

• Programmable mixed controller signal output(s)

provides ventilation control strategies to match exactly the application requirements

• Digital ON/OFF relay output for CO

• 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:

• - CO

and room temperature alternating

- Error code

-concentration (ppm)

- CO

- Temperature (°°°°C)

- Analog Output1

- Analog Output2

. Factory-calibrated 0...2000 ppm

and temperature measurement or control

limit monitoring

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

MODELS

Type Order Number

CO2 and Temperature Duct Sensor without LCD display

CO2 and Temperature Duct Sensor with 4-digit LCD display

TECHNICAL DATA

General

CO2 - Measurement

Temperature

Measurement

P++++I control

ACCESSORIES

Description Order Number

AQS51-KAM

AQS61-KAM

Power supply 24Vac ± 20%; 50/60Hz or 24Vdc ± 20%

Power consumption 2W

Sensor life expectancy >15 years

Maintenance interval 5 years

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

Converting range

Accuracy ±1% of measurement range, ±5% of reading

Pressure dependence

Annual zero drift < ±1% of measurement range

Operating principle Thermistor

Measurement range −10...60°C

Converting range

Accuracy ±0.2 K

Settings and configuration with Service Software AQS-USP22

- Throttling range CO

- Throttling range temperature 1...10 K

- Reset time adjustment ranges 2...500 sec (factory setting: 300 sec)

Service Software; 3.5” Diskette (for changing the sensing range, the parametrization and the post calibration)

Testset (consists of a portable gas generator for zero-position calibration, pump, packing, 3m tube, battery and transformer)

RS Cable with built-in electronics and adapters

0...2000 ppm = 0...10 Vdc (factory setting) or 2...10 Vdc / 0...20 mA / 4...20 mA

+1.58% of reading per kPa deviation from normal pressure 100 kPa

0...50 °C = 0...10 Vdc (factory setting) or 2...10 Vdc / 0...20 mA / 4...20 mA

100...800 ppm

AQS-USP22

AQS-F0005

AQS3/4 or AQS31/41

EN0B-1023 GE02R0700 2

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

Analog outputs

Digital relay output

Dimensions

Zigzag traces

(accessible after

removing the cover)

Shortage with a

screwdriver simulates

pushing of push button

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 ±2% of output current, ±0.3 mA

Protection PTC fuse (auto reset), short-circuit proof

Both outputs can be configured to any sensor mix (CO

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) (SPDT) switching, potential free contact. Factory adjusted switching

Relay activated: ≥1000 ppm

Relay deactivated: ≤900 ppm setpoint and differential

Sensor housing (84 x 142 x 46) mm

Sampling probe 203 mm

Toggles between the following 6 display modes on

the 4-digit display:

and temperature alternating

- CO

MENU Zigzag traces

- Error code

- CO

in ppm

- Temperature in °C

- Analog output 1

- Analog output 2

DIMENSIONS

0 9

2 4 1

203 42

Fig. 1 Dimensions in mm

EN0B-1023 GE02R0700

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