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Gas and Air Sensors
CO
/ CO sensor with built-in general purpose
2
General
The IAQ-sensor product aSENSE mIII is used to measure indoor air carbon dioxide
and carbon monoxide concentrations. It is a very flexible controller with
programmable outputs for both relay- and linear control of e.g. mixed air dampers,
humidifier and fans. The measured values are shown on the display.
The unit can alternatively be connected to common VAV (Variable Air Volume)
controllers, or Direct Digital Control (DDC). The linear output functions are pre-
programmed. All functions can be modified from a PC with the software UIP (version
4.3 or higher) and the RS232 communication cable.
Figure 1 aSENSE mIII for wall mounting and ventilation duct mounting
User Manual
aSENSE mIII
controller
Dokument
Rev
UMA0132
3
Sid
1 (16)
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Summary of Contents for SenseAir aSENSE mIII
- Page 1 / CO sensor with built-in general purpose controller General The IAQ-sensor product aSENSE mIII is used to measure indoor air carbon dioxide and carbon monoxide concentrations. It is a very flexible controller with programmable outputs for both relay- and linear control of e.g. mixed air dampers, humidifier and fans.
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Page 2: Functional Description
Gas alarm relay OUT4 = Sum alarm Figure 2 Print screen of UIP4.3 PC work space of aSENSE mIII where the pre- set functions can easily be redefined. The four outputs (far right) are here arranged in rows together with the function blocks that control the output. - Page 3 4 configuration Power (+) 24 VAC/DC+ 2W without output load (+-20%), 3W The same ground reference has to be used for the aSENSE mIII unit Power ground (-) 24 VAC/DC- and for the control system! Out(1) 0-10VDC 0-100 ppm CO...
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Page 4: Output Configurations
20% outputs point Figure 5 The connection terminal area of the aSENSE mIII with jumpers and terminals. The terminal DI1 may be used for forced ventilation. If the sensor has a heater it is connected to Dokument UMA0132... - Page 5 Table II. Configuration jumpers for aSENSE mIII Option - Network Adapter for Connection to RS-485-Network The network adapter can be used to connect the SenseAir sensor to a RS-485- network. The adapter is a small printed circuit board which can be used with all sensors with the housings large enough.
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Page 6: Display Modes
Push Button Operation for aSENSE mIII This sensor has two push buttons, MENU and ESC. The YELLOW LED will acknowledge a successful push by a short flash. The push button MENU is available for selection of display value or maintenance commands, whereas ESC is available to escape back from a selected level. -
Page 7: Maintenance Level
the Default display mode. If a permanent change of default values is requested the PC software is to be used. Function Display Time Function description Line limit CO / CO DEFAULT - Normal operation Error code. If no error has been detected the code E0 is shown. The Exxx error code is reset with Entr(+-). - Page 8 Confirm that a zero point calibration shall be done. Table IV. Maintenance functions available on aSENSE mIII to set output limits. Time limit refers to an internal time-out that returns the LCD and maintenance function back to normal. ENTER is a simultaneous pressing on MENU and ESC.
- Page 9 EXAMPLE I: Setting of the MAX value of the analogue outputs The access code is time limited. If the time limit is exceeded the sensor returns to DEFAULT. ENTR =MENU(+) and ESC(-) are pushed simultaneously. At the start of the setting the sensor is in DEFAULT. Push MENU(+) once to reach the error code.
- Page 10 Figure 10 Maintenance functions available on aSENSE mIII to set output limits. Only flow chart for setting High limits is shown, but Low limits are set in the very same way. The numbers in the flow chart refers to the points in example 1. Function blocks that are time limited are indicated by blue boarders.
- Page 11 Push ENTR(+-) once. The display shows EC and two digits. Enter the access code to the service menu. If the default code is used do like this: Push MENU(+) until the digits stop. The display shows EC55. If the correct code is not entered before the time limit exceeds the sensor returns to DEFAULT.
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Page 12: Functional Test
MENU(+) or ESC(-). The zero point calibration has a time limit. FUNCTIONAL TEST of CO / CO sensor aSENSE mIII Functional test The unit has three LED’s – green, yellow and red. These LED’s indicate the status of the controller. - Page 13 Test gas verification If the measurement of a sensor is to be verified, a test gas with carefully determined concentration of CO and CO must be used. For zero calibration pure nitrogen or air that has passed through a chemical absorber should be used. In fresh air the carbon monoxide concentration is nearly zero.
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Page 14: Self-Diagnostics
Self-diagnostics The system contains complete self-diagnostic procedures. A full system test is executed automatically every time the power is turned on. For aSENSE mIII the internal voltage regulators and outputs are checked. In addition, constantly during operation, checking the valid dynamic measurement ranges checks the sensor probes against failure. -
Page 15: Maintenance
CO) this PC tool has to be used. The check can be done on site without interfering with the ventilation system. Figure 12. The aSENSE mIII printed circuit board with the connection terminal area is enlarged. The terminal DI1 may be used for forced ventilation. If the sensor has a heater it is connected to... - Page 16 610036, Chengdu China Phone: +46 (0) 653 - 71 77 70 Phone: +1 (520) 349-7686 Phone: +86 - 028 875 928 85 E-mail: info@senseair.com E-mail: infoamerica@senseair.com E-mail: info@senseair.asia Web site: senseair.com Web site: senseair.com Web site: senseair.asia Dokument UMA0132 16 (16)
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