Data Sheet for Product

Technical Instructions QPM Series Indoor Air Quality Duct Sensors
Document Number CE1N1962
July 26, 2019
Page 6 Siemens Industry, Inc.
Mounting Notes
Mounting Location and
Orientation
• To ensure degree of protection, mount the sensor with the cable entry pointing
downward.
• Mount the sensor in a location where it can be easily accessed for service.
• If used in connection with steam humidifiers, the distance to the humidifier must be
a minimum of 9.8 feet (3 m). If permitted by the installation, the distance should be
as great as possible, but no more than 32.8 feet (10 m).
• Handle carefully; the sensing elements in the immersion rod are susceptible to
impact and shock.
• The sensor must not be mounted in a ventilation application on top of a building
(impact of solar radiation). To ensure correct operation, the sensor’s ambient
temperature must be between 23°F to 113°F (–5°C to 45°C).
Commissioning
Notes
Check the sensor’s functions 30 minutes after applying power.
• Checking the CO
2
function:
In well-ventilated spaces, the sensor shows the CO
2
concentration of the outside air.
Typically, this is 360 ppm (depending on the sensor’s measuring accuracy). Also, a
basic functional check can be made by exhaling on the sensor. Note that the
sensor’s rate of response has been purposely delayed (time constant t
90
=
5 minutes).
• Checking the VOC function:
Touch the sensor with a cotton ball dowsed in alcohol.
• Ventilation should start when the preset switching level of the connected controller
is reached.
• After applying power to sensors with display, Init will appear for approximately six
seconds.
Specifications
Power supply
Operating voltage (SELV) 24 Vac 20% or 15 to 35 Vdc
Frequency 50/60 Hz at 24 Vac
Power consumption 2 VA
Functional data, CO
2
Measuring range (MV = measured value) 0 to 2000 parts per million (ppm) *
Measuring accuracy @ 73°F (23°C) < + (50 ppm + 2% MV)
and 1013 hPa
Temperature dependency in 23°F to 113°F + 2 ppm/°C typically
(-5°C to 45°C) range
Long-time drift < + 5% measuring range/5 years
Time constant t
90
<5 minutes
Output signal, linear (terminal X1) 0 to 2000 ppm
Recalibration Not required for 8 years
* Allow up to 96 hours for unit to reach published accuracy.
Functional data,
maximum selection of
CO
2
and VOC with
QPM2102/QPM2102D
Measuring range VOC 0 to 2000 ppm
VOC sensitivity See Table 1
Output signal, linear (terminal X2) 0 to 2000 ppm
Response time, VOC signal t
voc
3 minutes/V