Figure 4. Air duct detector inlet sampling tube:

FLANGE

AIR HOLES

INLET

 

 

 

TUBE

 

 

END

 

 

PLUG

ARROWS

AIR FLOW DIRECTION

MUST FACE

 

INTO AIR FLOW

 

H0108-00

Figure 5. Tube mounting configurations with varying air flow direction:

DOTS INDICATE POSITION OF

SAMPLING TUBE HOLES

AIR FLOW

AIR FLOW

DIRECTION

DIRECTION

 

DETECTOR HOUSING

INLET

TUBE

DETECTOR

HOUSING

A.

 

B.

EXHAUST

EXHAUST

INLET

TUBE

TUBE

TUBE

HORIZONTAL MOUNTING OF HOUSING

EXHAUST

 

TUBE

DETECTOR

 

 

HOUSING

 

EXHAUST

 

AIR FLOW

TUBE

 

AIR FLOW

 

 

DIRECTION

 

 

DIRECTION

 

INLET

INLET

 

DETECTOR

TUBE

TUBE

D.

HOUSING

C.

 

VERTICAL MOUNTING OF HOUSING

H0109-00

[5.4.1] Installation For Ducts Less Than 8 Feet Wide

1.If the tube is longer than the width of the air duct, drill a 3/4-inch hole in the duct directly opposite the hole already cut for the inlet tube. If the tube is shorter than the width of the air duct, install the end plug into the inlet tube as shown in Figure 4. Sampling tubes over 3 ft. long must be supported at the end opposite the duct detector.

2.Slide the tube into the centermost housing bushing. Po- sition the tube so that the arrows point into the air flow.

3.Secure the tube flange to the housing bushing with two #6 self-tapping screws.

4.For tubes longer than the width of the air duct, the tube should extend out of the opposite side of the duct. If there are more than 2 holes in the section of the tube extending out of the duct, select a different length using Table 1. Otherwise, trim the end of the tube protruding through the duct so that 1 to 2 inches of the tube extend

outside the duct. Plug this end with the end plug and tape closed any holes in the protruding section of the tube. Be sure to seal the duct when the tube protrudes.

WARNING

In no case should more than 2 air inlet holes be cut off the tube. There must be a minimum of 10 holes in the tube ex- posed to the air stream.

[5.4.2] Installation For Ducts More Than 8 Feet Wide

NOTE: To install inlet tubes in ducts more than 8 feet wide, work must be performed inside the air duct. Sampling of air in ducts wider than 8 feet is accomplished by using the ST-10 inlet sampling tube. If the tube is shorter than the width of the air duct, install the end plug into the inlet tube as shown in Figure 4 and support the end opposite the duct detector.

D400-13-00

4

I56-555-09R

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System Sensor DH400ACDCP specifications Air duct detector inlet sampling tube

DH400ACDCP specifications

The System Sensor DH400ACDCP is a cutting-edge addressable smoke and heat detector specifically designed for commercial and industrial applications. Its advanced detection capabilities ensure a high level of safety in various environments, making it an essential component of modern fire alarm systems.

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