Engineering Notes - Siemens Q Series Technical Instructions

Technical Instructions
Document Number 155-755
February 28, 2013
Setting Element
Behavior in the Event of
a Fault
Calibration Certificates
(QFA41 Series only)

Engineering Notes

Cable Routing and Cable
Selection
Page 4
The setting element is located inside the cover. It consists of six pins and a jumper.
They are used to select the required temperature measuring range and to activate the
test function. The different jumper positions have the following meanings:
• For the active (0 to 10V or 4 to 20 mA) temperature measuring range with the
jumper in the:
Left position (1) = - 31°F to 95°F (-35°C to 35°C)
Mid position (2) = 32°F to 122°F (0°C to 50°C) (factory setting)
Right position (3) = - 40°F to 158°F (- 40°C to 70°C)
• For the active test function:
Jumper in the horizontal position: See Figure 2. Jumper Settings for Signal Output
Ranges for the values available at the signal output.
• If the temperature sensor is faulty, the voltage at signal output U2 (I2) is 0V (4 mA)
after 60 seconds. The humidity signal at signal output U1 (I1) increases to 10V
(20 mA).
• If the humidity sensor is faulty, the voltage at signal output U1 (I1) is 10V (20 mA)
after 60 seconds. The temperature signal remains active
The sensor and its exchangeable AQF4150 measuring tip are numbered, registered
and calibrated prior to delivery. The associated calibration certificates are supplied with
the sensor.
• Use a safety extra low-voltage (SELV) transformer with separate windings designed
for 100% duty.
• Observe all local and national safety regulations when sizing and protecting the
transformer.
• Take the sensor's power consumption into consideration when sizing the
transformer.
• See the devices' Installation Instructions for the sensor's electrical connection.
• Observe the maximum permissible cable lengths.
Electrical interference increases the longer the cables run parallel and the smaller the
distance is between them. Use shielded cables if necessary. Twisted pairs of cables are
required for the secondary supply lines and the signal lines.
Q-Series Outdoor Air and Critical Environment
Relative Humidity and Relative Humidity & Temperature Sensors
Figure 2. Configuring the Jumpers.
Siemens Industry, Inc.