Edwards SD-T8 Air Sampling Tube – 8 Inch

Name: Edwards SD-T8 Air Sampling Tube – 8 Inch
SKU: SD-T8
Availability: InStock

$20.00

The Edwards SD-T8 is an 8-inch rigid air sampling tube designed for Edwards SuperDuct duct smoke detectors. Installed across HVAC ductwork, it draws representative air samples into the detector for smoke monitoring and is suitable for approximately 7- to 12-inch-wide ducts.

30 in stock

Add to wishlist

SKU: SD-T8 Category: Accessories Brand: Edwards

Miami

The Edwards SD-T8 is a duct smoke detector air sampling tube used as part of Edwards/EST SuperDuct fire detection systems. It is not itself a smoke detector; instead, it is an accessory that extends into HVAC ductwork and directs sampled airflow through a compatible duct smoke detector.

Edwards documentation identifies the SD-T8 as an 8-inch sampling tube and lists it among the sampling-tube options for intelligent and conventional SuperDuct detectors. Current Edwards documentation for the SIGA-DDOS also continues to list the SD-T8 as an available accessory.

Product Functions

Samples air from HVAC ductwork
Works as part of a duct smoke detection system
Directs representative duct airflow into the detector
Supports detection of smoke transported through HVAC systems
Designed for Edwards SuperDuct detector assemblies
8-inch nominal sampling-tube length
Suitable for relatively narrow HVAC ducts
Installs through the duct detector housing
Can be installed from the front or back side of compatible detector housings
Uses inlet openings positioned toward the direction of airflow
Available as one of several Edwards SD-T-series sampling-tube lengths

Air Sampling Function

The primary purpose of the SD-T8 is to allow a compatible duct smoke detector to sample air moving through an HVAC duct.

The tube extends into the duct so that its inlet openings encounter the moving airstream. Air collected by the tube is routed through the duct detector’s sensing arrangement, where the associated smoke detector evaluates the sample for the presence of smoke.

This arrangement allows a duct detector to monitor air moving through HVAC equipment without placing the detector’s entire electronics assembly inside the duct.

8-Inch Sampling Tube

Nominal Tube Length: 8 inches

The SD-T8 is the shortest model identified in the common Edwards SuperDuct sampling-tube family. Manufacturer documentation lists the following tube options:

SD-T8: 8 inches
SD-T18: 18 inches
SD-T24: 24 inches
SD-T36: 36 inches
SD-T42: 42 inches
SD-T60: 60 inches
SD-T78: 78 inches
SD-T120: 120 inches

The appropriate tube is selected primarily according to the width of the HVAC duct being monitored.

Compatible Duct Width

Published distributor specifications for the SD-T8 identify a compatible duct-width range of:

Minimum Duct Width: 7 inches
Maximum Duct Width: 12 inches

Correct tube selection is important because the sampling arrangement must extend appropriately into the duct to obtain a representative airflow sample.

SuperDuct Compatibility

Edwards documentation lists the SD-T8 as an accessory across multiple generations/configurations of its SuperDuct products.

Documented applications include conventional SuperDuct detectors as well as Edwards intelligent duct detector products. The SD-T8 is specifically listed in documentation for products including the E-PDD Intelligent Duct Detector and conventional SD-2W systems.

Current Edwards documentation also lists the SD-T8 among the accessories for the SIGA-DDOS Optica Duct Smoke Detector, indicating continued use of this sampling-tube format.

Newark additionally specifies compatibility with the Edwards SD-4WJ four-wire duct smoke detector.

Sampling Tube Construction

The SD-T-series tubes are described as rigid metal sampling tubes.

The rigid construction allows the tube to maintain its position across the duct’s airstream after installation.

Unlike an electrical detector component, the SD-T8 does not require a power supply, signaling circuit, address, relay, or field wiring of its own.

Installation

The SD-T8 is installed in conjunction with a compatible Edwards duct smoke detector housing.

Typical installation involves:

Selecting the sampling tube according to duct width
Determining duct airflow direction
Installing the duct detector housing in the required location
Inserting the SD-T8 through the detector and into the duct
Orienting the sampling holes toward the incoming airflow
Securing the tube to the detector assembly
Confirming that the sampling tube is correctly positioned within the duct
Testing the completed duct detector installation

Edwards-compatible documentation indicates that the sampling tube is ordered separately from certain detector assemblies.

Newark notes that the rigid sampling tubes may be installed from either the front or back side of the detector housing without opening the detector.

Airflow Considerations

The sampling tube must interact correctly with the duct airflow for the complete smoke detector assembly to operate as intended.

For example, Edwards’ SuperDuct two-wire detector documentation specifies an overall detector air-velocity rating of 100 to 4,000 ft/min and an air-pressure differential range of 0.005 to 1.00 inches of water. These are specifications of the associated detector system rather than standalone ratings of the SD-T8 tube itself.

This distinction is important: the SD-T8 is a passive sampling accessory, so electrical and smoke-sensitivity specifications belong to the detector with which it is installed.

Physical Specifications

Product Type: Air Sampling Tube
Nominal Length: 8 in
Published Overall Height/Length: 8 in
Published Overall Width: 0.5 in
Construction: Rigid metal
Mounting Location: HVAC duct
Compatible Duct Width: 7–12 in

Edwards’ E-PDD documentation lists an approximate shipping weight of:

Shipping Weight: 0.5 lb / 0.2 kg

Electrical Specifications

The SD-T8 has no standalone electrical specifications because it is a passive air-sampling tube rather than an electrically powered detection device.

Therefore, specifications such as: