Data Sheet for Product

Technical Specification Sheet
Document No. 149-918
August 23, 2016
Siemens Industry, Inc. Page 1 of 2
Surface Mount Temperature Sensors
With Electrical Box
Strap-on Cable Only
Self-Contained
Description
Siemens Surface Temperature Sensors monitor and
transmit changes in temperature to the HVAC control
system. The sensor resistance varies proportionally to
the actual temperature being measured.
The self-contained sensors and units with electrical
boxes are ideal for measuring pipe surface
temperature as a surrogate for actual fluid
temperature when it is not possible to retrofit a full
immersion type sensor.
The strap-on cable style sensors can be used to
acquire pipe surface temperature and can also be
used to quickly acquire duct air temperature. When
fitted with an appropriate protection tube, it can
acquire temperature within a concrete slab.
The QAH11.1 is designed specifically for use as a
changeover temperature sensor with Siemens RDG
Series room thermostats.
Multiple output signals are available to ensure
compatibility with most common HVAC control
systems.
Features
 Variety of sensing elements.
 Suitable for hot or chilled fluids.
 Responsive to temperature change.
 Accurate and reliable indication of temperature.
 Easy installation requires no special tools.
Specifications
Output
Signals
100K Ω Thermistor
10K Ω Type 2 Thermistor
10K Ω Type 3 Thermistor
1K Ω @ 32°F Ni RTD
1K Ω @ 70°F Ni RTD
1K Ω Pt RTD (375a)
1K Ω Pt RTD (385a)
4 to 20 mA
Accuracy
See Table 1.