SIemens Improves VFD Flexibility with NEMA 3R Mounting Option

BUFFALO GROVE, Ill., - Siemens Building Technologies, Inc. has introduced a NEMA 3R enclosure package for its line of SED2 Variable Frequency Drives (VFDs). NEMA 3R enclosures allow outdoor mounting of VFDs near the controlled mechanical equipment and permit short motor lead-lengths for optimum performance. The SED2 NEMA 3R package is equipped with a main input fused disconnect and optional two- or three- contactor bypass and line reactor. The NEMA 3R package protects SED2 VFD and bypass components from rain, snow and ice. The cabinet is provided with a shield that protects the unit from heating effects of indirect sunlight.

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A filtered inlet, fan-controlled exhaust, and thermostatically controlled heater are supplied to ensure that required enclosure ambient conditions are maintained (0-40 degrees C). A High Temperature option is available for locations that can reach up to 50 degrees C.
Siemens SED2 Variable Frequency Drives, as well as the full line of Siemens HVAC sensors, valves, actuators and building control systems are available through hundreds of Siemens Building Technologies local offices, drive reps and Staefa Control System dealers.

For more information on Siemens Building Technologies, visit www.sbt.siemens.com/hvp.

Siemens Improves Building Comfort with New Line of High Accuracy Humidity/Temp Sensors

BUFFALO GROVE, Ill. - Siemens Building Technologies, Inc. has introduced the Q-Series family of relative humidity duct sensors. These new sensors, which can be used in all standard HVAC building control applications where humidity control is required, improve building comfort by using a highly accurate embedded microprocessor that converts the sensor's digital signal to a continuous 0-10 Volt dc signal, which corresponds to 0-100% relative humidity.

The Q-Series duct humidity sensors contain a number of built-in features for easy installation and serviceability. The digital sensing technology requires no calibration or adjustment. The Q-Series family offers a number of accessories , including filters, filter caps, jumpers, termination blocks and mounting flanges. Removable filter caps can be replaced if the filter element gets dirty or damaged. Replaceable sensing tips allow the user to remove the sensing element tip without disrupting the installation or wiring.

Siemens offers sensors that measure relative humidity only, or combination humidity and temperature, with several different control signals, including 0-10 Volt, 4-20 mA, and RTD outputs. Humidity output signals are either 0-10 Volt or 4-20 mA. Standard humidity range is 3/5% accuracy -- 3% over the comfort range (30 - 70% RH) and 5% over the full range (0-100% non-condensing). Two percent accuracy versions are also offered. Three different jumper selectable temperature ranges allow for sensing in a variety of environments.

Siemens Q- Series duct humidity sensors--as well as the full line of Siemens HVAC sensors, valves, actuators and building control systems-are available through Siemens Building Technologies local offices, HVAC wholesalers and Staefa Control System dealers.

For more information on Siemens Building Technologies, visit www.sbt.siemens.com

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