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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 1K

 

QFM2120

 

Ni 1K

 

QFM2140

 

T1 PTC

 

±5% 

QFM3110

 

Pt 1K

 

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

 

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