Siemens QFM3100 Service-Handbuch

Installation Instructions

Document No. 129-413

October 5, 2009

Q-Series Relative Humidity (RH) and

Relative Humidity & Temperature (RH/T) Duct Sensors

Item Number 129-413, Rev. CA Page 1 of 3

Product Description

Relative Humidity (RH) and Relative Humidity &

Temperature (RH/T) duct sensors monitor the

relative humidity or the relative humidity and

temperature in a duct, depending on the model.

Sensors are directly wired to the controller via

twisted pair and/or three conductor cables

(18 to 22 AWG). The number and type of cables

required depends on the model selected. All field

wiring is terminated in a terminal block on the sensor

body.

Product Numbers

Table 1. Relative Humidity Only.

Product

Number Humidity

Signal Accuracy♦

QFM2100

0 to 10 Vdc

±5%

QFM3100

±2%

QFM2101

4 to 20 mA

±5%

QFM3101

±2%

QFM4101

±2% Certified

Table 2. Relative Humidity and Temperature.

Product

Number Temperature

Signal Humidity

Signal Accuracy♦

QFM2160

0 to 10 Vdc 0 to 10 Vdc

±5%

QFM3160

±2%

QFM3160D

QFM4160

±2% Cert.

QFM2171

4 to 20 mA 4 to 20 mA

±5%

QFM3171

±2%

QFM3171D

QFM4171

±2% Cert.

QFM2110

Pt 1KΩ

0 to 10 Vdc ±5%

QFM2120

Ni 1K

Ω

QFM3110

Pt 1K

Ω

±2%

♦ Applies to humidity only

NOTE: Sensor tips on QFM31… and QFM41…

models are field replaceable.

Additional Reference Documents

Product Number Technical Instructions

QFM21…

155-748

QFM3160

155-749

QFM4160

155-750

Required Tools

•Phillips screwdrivers, No. 1 and No. 2

•Wire cutters/strippers

•Medium flat-blade screwdriver

•Tape measure

•Medium-duty electric drill

•Marker or pencil

•No. 26 (0.147-inch) drill bit

•Small level

•7/8-inch drill bit or hole saw

•Two No. 8 × 1-inch sheet metal screws

Expected Installation Time

One hour

Prerequisites

•Ensure that the appropriate field wiring is

installed.

Appropriate wiring is one or more twisted

pairs, or three conductor cables (plenum or

non-plenum as required), within the maximum

wiring run length for the individual equipment

controller. The maximum recommended

length is 750 feet (229 m).

•Ensure that all wiring complies with National

Electric Code (NEC) and local regulations.

Mounting Information

Locate the sensor:

•In the center of a duct.

•Away from fans, corners, heating and cooling

coils, and so on.

•Where it receives adequate airflow for proper

operation.

Document No. 129-413

Installation Instructions

October 5, 2009

Page 2 of 3 Siemens Industry, Inc.

Instructions

1. Drill a 7/8-inch diameter hole into the duct at the

desired location of the sensor.

2. Decide if the sensor will be mounted directly to

the duct or if the mounting flange will be used.

•Sensor Mounting Bracket Installation

a. Use the bracket as a template, and drill

two holes with a No. 26 (0.147-inch) drill

bit. See Figure 1(B).

b. Attach the sensor mounting bracket and

gasket to the duct using two No. 8 × 1-

inch sheet metal screws. See

Figure 1(C1).

c. Insert the sensor in the duct through the

bracket and tighten the mounting screw

to set the insertion depth. See

Figure 1(C2).

•Direct installation:

a. Remove the sensor cover.

b. Use the base as a template, and drill four

holes with a No. 26 (0.147-inch) drill bit.

See Figure 1(B).

c. Insert the probe through the gasket and

into the hole. Secure the head to the duct

with four No. 8 × 1-inch sheet metal

screws.

3. Attach conduit or plenum wire to the sensor

base. See Figures 1 and 2.

4. If you are using conduit, pull the field wiring

through the conduit and into the sensor base.

5. Connect the field wiring to the sensor terminal

block on the base. See Figures 3 through 7 for

wiring diagrams.

6. Reinstall the sensor cover. See Figure 1(C6).

The installation is now complete.

Figure 1. RH/T Duct Sensor Installation. Figure 2. Conduit or Plenum

Cable Wiring Installation.

NOTE: Figure 2 shows how to connect the conduit or plenum cable to the sensor head.

Document No. 129-413

Installation Instructions

October 5, 2009

Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and

models as design improvements are introduced. Product or company names mentioned herein may be the trademarks of their respective

Siemens Industry, Inc.

Building Technologies Division

1000 Deerfield Parkway

Buffalo Grove, IL 60089

+ 1 847-215-1000

Your feedback is important to us. If you have

comments about this document, please send them

to SBT_technical.editor.us.sbt@siemens.com

Document No. 129-413

Printed in the U.S.A.

Page 3 of 3

Wiring Diagrams

Figure 3. Rh Sensors, 0 to 10 Vdc.

Figure 4. Rh Sensors, 4 to 20 mA.

Figure 5. Rh/T Sensors, 0 to 10 Vdc.

Figure 6. Rh/T Sensors, 4 to 20 mA.

Figure 7. Rh/T Sensors, Thermistor RTD, 0 to 10 Vdc.

NOTE: For individual panel wiring details, see the

appropriate hardware manual.

NOTE: For QFM3171(D): Terminals G1(+) and I1(-) for the humidity output must always be connected to power,

even if only the temperature output G2(+) and I2(-) is used.

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