Siemens QFM2100 Manual de servicio

Installation Instructions

Document No. 129-413

October 13, 2004

Q-Series Relative Humidity (RH) and

Relative Humidity & Temperature (RH/T) Duct Sensors

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 ±5%

QFM3100 0 to 10 Vdc ±2%

QFM2101 ±5%

QFM3101 ±2%

QFM4101

4 to 20 mA

±2% Certified

Table 2. Relative Humidity and Temperature.

Product

Number

Temperature

Signal

Humidity

Signal Accuracy♦

QFM2160 ±5%

QFM3160 ±2%

QFM4160

0 to 10 Vdc 0 to 10 Vdc

±2% Cert.

QFM2171 ±5%

QFM3171 ±2%

QFM4171

4 to 20 mA 4 to 20 mA

±2% Cert.

QFM2110 Pt 1KΩ

QFM2120 Ni 1KΩ

QFM2140 T1 PTC

±5%

QFM3110 Pt 1KΩ

0 to 10 Vdc

±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, #1 and #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.

Item Number 129-413, Rev. 011 Page 1 of 3

Document No. 129-413

Installation Instructions

October 13, 2004

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.

2.4

(60)

0.83

(21)

2.4

(60)

2.4

(80)

SEN0353R1

max. 6.1

(154) mm

Four holes required

if sensor base is

mounted directly onto

the duct

Two holes required

if flange is used to

mount the sensor

onto the duct

See Figure 2

for conduit or

plenum cable

wiring instructions

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.

Page 2 of 3

Document No. 129-413

Installation Instructions

October 13, 2004

Wiring Diagrams

6 5 4 3 2 1

U1 G0 G

HUM: 0 to 10 Vdc

GND or Common

24 Vac ± 20%

13.5 to 35 Vdc

SEN0356R1

Figure 3. Rh Sensors, 0 to 10 Vdc.

6 5 4 3 2 1

I1 G1

HUM: 4 to 20 mA

13.5 to 35 Vdc

SEN0354R1

Figure 4. Rh Sensors, 4 to 20 mA.

SEN0357R1

6 5 4 3 2 1

U2 U1 G0 G

TEMP: 0 to 10 Vdc

HUM: 0 to 10 Vdc

GND or Common

24 Vac ± 20%

13.5 to 35 Vdc

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

SEN0358R1

6 5 4 3 2 1

I2 G2 I1 G1

TEMP: 4 to 20 mA

13.5 to 35 Vdc

HUM: 4 to 20 mA

13.5 to 35 Vdc

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

SEN0355R1

6 5 4 3 2 1

MS BS U1 G0 G

}

TEMP: 1K Pt / 1K Ni / T1

HUM: 0 to 10 Vdc

GND or Common

24 Vac ± 20%

13.5 to 35 Vdc

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

NOTE: For individual panel wiring details, see the

appropriate hardware manual.

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. Other product or company names mentioned herein may be the trademarks of their

Siemens Building Technologies, Inc.

1000 Deerfield Parkway

Your feedback is important to us. If you have

comments about this document, please send

Buffalo Grove, IL 60089-4513

U.S.A.

them to [email protected]

Document No. 129-413

Country of Origin: US

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