Dwyer Series SAH SMART Air Hood® Balancing Instrument
Specifications - Installation and Operating Instructions
Bulletin TE-SAH
Introduction
The Series SAH SMART Air Hood® Balancing Instrument is an accurate and easy-to-operate air flow hood. It utilizes an included hood stand and wireless communication to a handheld device, allowing a single operator to balance air flow in branches more efficiently than traditional methods. Its ergonomic design and lighter weight compared to traditional capture hoods reduce physical stress. The rugged polypropylene base hood features patented Quad Flow Design Technology for controlling airflow and minimizing back pressure, ensuring superior measurement accuracy. Wi-Fi direct communication provides reliable connectivity up to 200 yards (183 m) between the hood and the handheld instrument. The SMART Air Hood® balancing instrument includes the SMART Air Hood® application software, which streamlines the air flow balancing process using Predictive Balancing's Express Balance mode, predicting optimal flow set points and adjustment order for each register.
Included with the SAH Kits:
- Handheld test instrument preloaded with SMART Air Hood® App
- 3' (0.9 m) extendable pole
- Handheld quick release pole adaptor kit
- SAH roller travel case with instrument available foam inserts
- Charging cables for SAH and handheld
- Lithium ion battery (not included in international versions)
- Installation and operating manual
- NIST traceable certificate
Specifications
SAH Specifications
| Service | Air |
|---|---|
| Units | CFM, m³/h, l/s |
| Volume Flow Ranges | Supply: 40 to 2000 CFM (68 to 3398 m³/h) (19 to 944 l/s); Exhaust: 80 to 2000 CFM (136 to 3398 m³/h) (38 to 944 l/s) |
| Accuracy > 40 CFM | ±3% of reading ±7 CFM (11.9 m³/hr) (3.3 l/s) |
| Resolution | 1 CFM (1.7 m³/h) (.5 l/s) |
| Power Requirements | 3.6 V NCR18650B MH12210 lithium ion battery, included, user replaceable or (4) 1.5 V AA alkaline batteries, not included, user replaceable |
| Housing Material | Polypropylene |
| Weight | 5.75 lb (2.6 kg) |
| Compliance | CE, FCC, IC, RCM (-AU model only) |
Handheld Specifications
| Operating System | SMART Air Hood® application software only available with factory supplied test instrument |
|---|---|
| Wireless Protocol | Wi-Fi direct low energy wireless technology |
| Response Time | 1 s |
Model Chart
| Model | Description |
|---|---|
| SAH-22 | SMART Air Hood® balancing instrument with 2' x 2' (0.6 m x 0.6 m) opening |
| A-SAH-12P | 4.5' to 12' (1.4 m x 3.7 m) extendable pole (Required for operation) |
| SAH-22HC | SMART Air Hood® balancing instrument with 2' x 2' (0.6 m x 0.6 m) opening, with hard travel case |
Accessories
| Model | Description |
|---|---|
| A-SAH-12P | 4.5' to 12' (1.4 m x 3.7 m) extendable pole |
| A-SAH-14S | Canvas hood 1' x 4' (0.3 m x 1.2 m) |
| A-SAH-15S | Canvas hood, 1' x 5' (0.3 m x 1.5 m) |
| A-SAH-24S | Canvas hood, 2' x 4' (0.6 m x 1.2 m) |
| A-SAH-33S | Canvas hood, 3' x 3' (0.9 m x 0.9 m) |
| A-SAH-44S | Canvas hood attachment, 4' X 4', (1.2 m x 1.2 m) |
| A-SAH-BK | SAH adaptor base kit for canvas hood |
| A-SAH-CK | Spare calibration kit with four quad flow sensing grids and sensor module |
| A-SAH-HC | Hard carrying case for SAH |
| A-SAH-PLUG | Low flow plug |
| A-SAH-SC | Replacement SMART Air Hood® travel case |
Feature Outlines
SAH Hood Components
The SAH hood features a battery compartment, a charging port, a sensor module, an antenna, a pole mounting plate, a power button, and detachable quad flow sensing grids.
Handheld Instrument Components
The handheld instrument includes a proximity sensor, earpiece, front camera, volume buttons, power button, SIM and microSD card tray, microphone, headset jack, flash, depth camera, speaker, main camera, fingerprint sensor, and a USB-C/charger port.
Dimensional Drawings
The hood has overall dimensions of approximately 24.074 inches (611.48 mm) by 24.074 inches (611.48 mm). Key internal dimensions include a depth of 8.909 inches (226.28 mm) and other measurements related to the sensing grids and housing, such as 7.103 inches (180.42 mm) and 5.543 inches (140.80 mm).
Introduction and Safety
WARNING: Do not use the handheld instrument/hood unit for liquid or gas mixtures other than air. Dwyer Instruments, Inc. assumes no responsibility for damage resulting from use with corrosive, dangerous, or explosive gas mixtures. Ensure safe handling when checking air flow at ceiling diffusers. The unit is not flameproof or intrinsically safe and must not be used where an explosion hazard exists. It is not authorized for life support applications.
Note: Observe standard safety procedures when working on ladders and scaffolding. Ensure the unit does not become caught in moving machinery or on sharp objects.
CAUTION: Allow the unit to stabilize at room conditions if stored outside normal operating range. Exercise care when carrying the assembled unit. Avoid people, nearby equipment, and objects that could damage the hood. Turn the instrument off and remove batteries for long-term storage. Avoid excessive loading on quad flow sensing grids; any airflow not through calibrated holes will affect sensitivity. Damaged sensing grids cannot be repaired and must be replaced. Do not disassemble sensing grids during readings. Static electric charges may be encountered in low humidity; use an anti-static solution.
Setup
Battery Requirements
SAH Battery
WARNING: Fire Hazard While Charging Battery. Match lithium-ion battery polarity symbols carefully. The positive terminal of the NCR18650B battery is marked with a wide black band. If a SAH-22-IN (without battery) was purchased, a 3.6 V NCR18650B lithium ion battery or equivalent must be installed.
Charge the unit using the included charging cable before first use. Connect the mini-USB end to the unit's charging port and the USB end to a charging block. Ensure correct battery polarity.
Handheld Instrument Battery
The handheld instrument has an internal rechargeable battery. The battery symbol on the screen indicates status. The unit ships with a partial charge; use the included USB charging cable to charge fully before use. The battery symbol turns red when low.
Installation
Assembling Accessories
To mount the hood onto a diffuser, it must be attached to one of the provided poles. Align the pole's end hole with the hood's mounting plate holes. Insert the locking pin to secure the pole. Start by inserting the pin into the alignment hole opposite the power button. Press the pin's end button to insert or remove.
For shorter ceilings or when using the SAH adapter base kit for canvas hoods, use the stationary pole adapter to prevent pivoting. Attach the adapter to the SAH with provided screws and wing nuts. Insert the short pole and secure with the locking pin.
Operation
Connecting the SMART Air Hood® Balancing Instrument to the Smart Air Hood® Application Software
The hood's LED lights indicate communication status with the handheld:
| Blue LED State | Red LED State | Connection Status |
|---|---|---|
| 50% duty cycle | 50% duty cycle | Not connected |
| 20% duty cycle | 20% duty cycle | Attempting to connect |
| 5% duty cycle | 5% duty cycle | Connected |
Placing the SMART Air Hood® Balancing Instrument on a Diffuser
Place the hood on the diffuser, ensuring the seal completely surrounds it without leaks. Check all sides and corners. Twist the pole to adjust its length so it supports the hood on the floor. If not free-standing, re-adjust the pole length.
Wired Connection
The SAH can connect directly to the handheld via a mini-USB cable and micro-USB adapter. Wi-Fi is disabled during a wired connection, which is useful for unreliable Wi-Fi or when prohibited. Wi-Fi re-enables upon disconnecting the USB cable.
Airplane Mode
Airplane mode disables all wireless communication on the handheld. It is useful in environments restricting wireless use. With Airplane Mode enabled, the SAH can only be used with a wired connection. To enable: 1. Press Home button. 2. Swipe down for notification bar. 3. Swipe down again for quick settings. 4. Locate and click "Airplane Mode". To disable, repeat steps 1-4.
Troubleshooting
| Reported Problem | Possible Solution |
|---|---|
| No or not changing data | Verify sensor module is plugged in. Check for leaks in diffuser sealing. Verify SAH connection via LED. Ensure quad flow sensing grids are seated and undamaged. Check hood seal. Check for blockages in inlets/outlets. Check for cracks in hood body. |
| Reading is too high or low | Verify quad flow sensing grids are seated and undamaged. Check hood seal. Check for blockages in inlets/outlets. Check for cracks in hood body. Check for damage in rubber seal. |
| Cannot connect to hood | Verify connection attempt is within proximity of handheld. Restart PredictAir™ application. Power cycle hood/handheld. Check battery status of both units. |
Maintenance
Routine maintenance ensures longevity:
- Remove moisture droplets with a lint-free cloth/paper towel before storing.
- Remove all batteries for extended storage.
- Store and transport carefully in dry conditions.
- Do not immerse the hood in water. Do not use abrasive cleaning products. Wipe with a damp lint-free cloth.
- Do not use abrasive cleaning products on sensing grids. Gently wipe with a lint-free cloth, ensuring air entry holes are not contaminated.
- Periodically check for damage or cracks.
- Take care not to damage or obscure sensing grid air entry holes, as this affects measurements.
Diffuser adapter hood fabric can be wiped with a damp cloth and dried. Periodically wash in cool water with mild detergent and drip dry. The fabric is durable but should be replaced if worn or torn, as this affects measurements. Apply anti-static solution with a lint-free cloth in low humidity conditions.
Annual Calibration
Annual calibration is recommended for accuracy. Send all four quad flow sensing grids and the sensor module to a Dwyer authorized service facility. Contact customer service for details.
Repair
The Series SAH SMART Air Hood® balancing instrument is not field serviceable. Field repair is not possible and may void the warranty.
Warranty/Return
Refer to "Terms and Conditions of Sale" in the catalog or website. Contact customer service for a Return Materials Authorization (RMA) number before shipping for repair. Include a problem description and application notes.
FCC/Industry Canada Notices
FCC/Industry Canada Notice
NOTICE: This device complies with Part 15 of the FCC rules. Operation is subject to two conditions: (1) it may not cause harmful interference, and (2) it must accept any interference received, including interference that may cause undesired operation.
This equipment has been tested and found to comply with Class B digital device limits per FCC Rules, designed for reasonable protection against harmful interference in residential installations. It generates, uses, and can radiate radio frequency energy. If not installed/used per instructions, it may cause harmful interference to radio communications. If interference occurs (determined by turning off/on), users are encouraged to correct it by:
- Reorienting or relocating the receiving antenna.
- Increasing separation between equipment and receiver.
- Connecting to an outlet on a different circuit than the receiver.
- Consulting a dealer or experienced radio/TV technician.
NOTICE: This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to two conditions: 1. This device may not cause harmful interference; 2. This device must accept any interference received, including interference that may cause undesired operation.
CAUTION: Pursuant to FCC 15.21, changes or modifications not expressly approved by Dwyer Instruments, Inc. may void the user's authority to operate the equipment.
RF Notice
NOTICE: This product complies with FCC OED Bulletin 65 and Industry Canada's RSS-102 radiation exposure limits for an uncontrolled environment.
NOTICE: This Class B digital apparatus complies with Canadian ICES-003.
CAUTION: The antenna used for this transmitter must maintain a separation of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.
AVIS (French Translation of Notices)
AVIS: Cet appareil est conforme à Industrie Canada une license standard RSS exonérés (s). Son fonctionnement est soumis aux deux conditions suivantes: 1. Cet appareil ne doit pas provoquer d'interférences, 2. Cet appareil doit accepter toute interférence reçue, y compris les interférences pouvant provoquer un fonctionnement indésirable de l'appareil.
AVIS: Ce produit est conforme aux limites d'expositions aux rayonnements définies pour un environnement non contrôlé du Bulletin 65 FCC OET et RSS-102 Industry Canada.
