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Home » Products » Carbon Dioxide Sensors » Carbon Dioxide & Temperature Transmitter for Wall Mounting » Carbon Dioxide & Temperature Transmitter for Wall Mounting

Carbon Dioxide & Temperature Transmitter for Wall Mounting

Carbon Dioxide & Temperature Transmitter for Wall Mounting
Carbon Dioxide & Temperature Transmitter for Wall Mounting
Product Code : A SENSE
Product Description

A SENSETM is an all - digital low-cost transmitter for installation in the climate zone. It measures both CO2 concentration and temperature in the ambient air. The data is transmitted to a BMS system or controller. aSENSETM is a key component for climate control of buildings and other processes. It is also a cost-efficient gas alarm sensor for spaces where carbon dioxide gas is a potential danger.

Features :

  • State-of-the-art Non-Dispersive Infrared (NDIR) technology to measure CO2
  • Maintenance free in normal applications
  • Cost optimized for connection to DDC:s
  • Contributes to lower energy costs when it is applied in a Demand Control Ventilation (DCV) strategy
  • Available in different carbon dioxide measurement ranges and different housings
  • Internal automatic self diagnostics
  • 2 analogue outputs as standard (V/mA). Relay output as option
  • Cost-efficient RS485 communication as option
  • Internal 2-channel logger as option

APPLICATIONS

A SENSETM is designed to control ventilation by transmitting the measured carbon dioxide and temperature value to the system's Master or DDC. The transmitter is flexible and suits many different ventilation strategies. According to most building regulations, the fresh air flow should, in rooms where people stay more than occasionally, be at least 7 litres/sec and person. If the room occupants are adults with a light work-load and the outdoor CO2 concentration is 350 ppm, this airflow answers directly to an in-door CO2 concentration of 1040 ppm. According to National Boards of Occupational Safety and Health, the CO2 concentration can therefore be used as an indicator of the Indoor Air Quality (IAQ). A CO2 concentration below 1000 ppm should then always be the aim.

Specification :

General Performance


Compliance with

EMC directive 89/336/EEC, RoHS directive 2002/95/EG

Operating Temperature Range

0 to +50oC

Storage Temperature Range

- 40 to +70oC (standard model) (models -D: -20 to + 70oC)

Operating Humidity Range

0 to 95% RH (non-condensing)

Warm-up Time

< 1 min(@ full specs ≤ 10 minutes)

Sensor Life Expectancy

> 15 years

Maintenance Interval

No maintenance required

Self Diagnostics

Complete function check of the sensor

Display

4 Digits, 7 segments LCD with ppm / oC / % indicator (models -D)

Electrical/Mechanical


Power Input

24 VAC/VDC+20%, 50-60 Hz (half-wave rectifier input)

Power Consumption

< 3 Watts average

Wiring Connections

Screw terminals, max 1,5 mm2 wires/ European and US standard J-boxes

Outputs


Analogue3


Protection

PTC fuse (auto reset) on signal return M, short-circuit safe

Linear outputs OUT1 & OUT2

0/2-10 VDC ROUT < 100 OHM, Rload > 5k OHM (0/1-5 VDC optional) 0/4-20 mA Rload < 500 OHM

Default ranges

0 - 2000 ppm CO2, 0 - 50oC

D/A Resolution

10 bits, 10 mV / 0.016 mA

D/A Conversion Accuracy.

Voltage mode: + 2% of reading + 50 mV
Current loop : + 2% of reading + 0.3 mA

ON/OFF


Relay (OUT3)


UART Serial com port

(accessory -R) isolated N.O., 1mA/5V up to 1A/50VAC/24VDC.



Protocol.

SenseAir protocol (see comprot 0700xx rev 3_04.pdf ) Modbus as option4

PC-interface.

RS232 UART cable with sliding contact and driver (model A232 Cable)

PC User Interface Program

UIP4 (or higher)5

RS485 network com

(accessory -485) RS485 terminal slide-on port, network capabilities up to 30 units

LonWorksTM network com.

(accessory -LON) LonWorks add-on Option Modbus RTU

CO2 Measurement


Operating Principle

Non-dispersive infrared (NDIR) with Automatic Baseline Correction (ABC)6

Response Time (T1/e)

2 mindiffusion time

Accuracy7

+ 1% of measurement range + 5 % of measured value

Pressure Dependence.

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

Annual Zero Drift7

< +0.3 % of measurement range

Measurement ranges.

Different sensor models from 0 - 3 000 ppm (standard) to 0 - 10 %vol.

Temperature Measurement


Operating Principle.

Thermistor

Measurement Range

-20 to +60 oC

Accuracy / Digital Resolution

+ 0.5 oC / 0.1 oC (0.01 oC via UART)


JUPITER INTEGRATED SENSOR SYSTEMS PVT. LTD.

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