Angst+Pfister MiCs-2614 User manual

103-24-394-002-EH-1214.pdf
MiCs Quick Start Evaluation Board
SGX Sensortech
Page 1
Instant testing – Just add power
Test 5 dierent MiCs devices
Complete Circuit on PCB for each Sensor
7 to 20 V Input Supply Voltage
MiCs Quick Start Evaluation Board
Overview
While the MiCs SMD parts are dicult to test and require a 5 V power supply for correct operation, the Quick Start
Demo board allows the user to be testing the SGX SMD metal oxide gas sensors within minutes after opening the
box. The MiCs quick start board can use any input power supply from 7V to 15 V. One of ve dierent sensors can be
placed into the universal onboard IC socket, and by installing the correct jumper the circuit is congured for imme-
diate testing of the sensor.
The MiCs quick Demo board can individually test the following MiCs sensors: MiCs-2614 (Ozone), MiCs-5524 (CO),
MiCs-2714 (NO2), MiCs-4514 (Dual senor, CO and NO) and the MiCs- 5914 (NH3) just by installing the correct jump-
ers as shown on the PCB. (4 Jumpers are included in each kit).
Circuit Overview
The circuit for each sensor is exactly
the circuit shown on the individual
datasheet for the parts, and the
jumpers will allow for the correct re-
sistors conguration required. While
the input voltage is 7 to 20V, the
board uses a regulator (LM7805T)
to reduce the voltage to the MiCs
device to 5V. After this, the jump-
ers determine the circuit used to
correct supply the heater and load
resistance for each device. The com-
plete circuit of the Quick Start Demo
board is shown in Figure I.
The individual circuits for each of the metal oxide sensors are very
simply and straight forward. Please note that the TI regulator was left
out of the circuit diagrams below for simplicity only, so will the input
supply voltage can be 7V to 25V, V+ for the individual circuits is 5V.
PRELIMINARY
1 MiCS_1620-21530-0002-E-1214

103-24-394-002-EH-1214.pdf
MiCs Quick Start Evaluation Board
SGX Sensortech
Page 2
MiCs-2614 and the MiCs-5524
To test the MiCs-2614 (Ozone sensor) or the MiCs-5524
(Carbon Monoxide) only Jumper 1 and 2 should be installed.
With these jumpers in place the circuit is:
MiCs-5914
To test the MiCs-5914 (Ammonia sensor) only Jumper 2 and 5
should be installed. With these jumpers in place the circuit is:
MiCs-2714
To test the MiCs-2714 (Nitrogen Dioxide sensor) only Jumper
3 and 4 should be installed. With these jumpers in place the
circuit is:
In the conguration, the CO sensor is on Vout A, and the NO2
output is on Vout B.
MiCs-4514
To test the dual MiCs-4514 (Carbon Monoxide and Nitrogen
Dioxide sensor) only Jumper 1, 2, 3 and 4 should be installed.
With these jumpers in place the circuit is:
Conclusion:
The quick start demo board will allow the quick testing of the MiCs sensors, and overcomes the common drawback of working with sur-
face mount devices. However, please make sure to the MiCs-AN2 Q and A, as this will answer many of the most common questions asked,
notable:
1) The MiCs sensors are not generally used as an exact measurand device. That is, you will not be able to measure to an exact ppm or ppb
level, but rather they are best used a low/med/high indication of a gas presence.
2) The MiCs devices work best in a constant airow application. These devices are not made to sit in the corner of a room and monitor air.
The best situation would be to have the sensor sit in the air duct and air input or output.
3) While the MiCs sensor are advertised to monitor one gas, the sensors are all cross sensitive to other gases. Testing in a given application
is highly recommended.
4) Pulsing power to the senor is not recommended. In general, the sensors have long warm up time to function properly.
AN2 will guide you through other questions as well. However, while there are a few quirks when using the MiCs device, over 20 Million
sensors are used annually for IAQ applications. Good Luck with yours!
2 MiCS_1620-21530-0002-E-1214

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