I need to monitor air velocity within a supply and exhaust duct, both are connected to a Class I Division 1 rated gashouse. Is this possible with the 641B in conjunction with an isolated barrier/repeater? The 641B will be duct mounted outside of the gasho
Unfortunately, you cannot use the 641b in a classified area as it is not intrinsically safe
For the AAFS air flow paddle switch, is there an adjustment that can be made in order to install in vertical ductwork?
The AAFS air flow paddle switch can only be installed in horizontal duct flows.
I am looking for a Dwyer flow switch model V6EPB-BD4B-CSA. My concern is that our switch has a ACT 2.4 GPM or less, but in your website this flow switch shows a different ACT GPM. I am attaching a picture of our switch for your review and recommendation.
It sounds like you have a Special made-to-order switch. This will not be found on our website. Please call one of our Application Engineers and they will be happy to help you.
What flow rate does the TDFS2 work with?
The TDFS2 can withstand high flow rates and works for setpoint ranges from 0.5 to 10 ft/s (0.15 to 3.0 m/s). As this varies by pipe size, refer to the installation manual for a full flow table by pipe size for exact applicable flow ranges.
Can I use this product for sediment-laden liquids?
The TDFS2 is designed for homogeneous liquids. However, it has no moving parts and can withstand sediment. As long as the installation instructions are followed and the unit is installed in a chemically compatible fluid, the TDFS2 can be used.
What flow rate does the TDFS2 work with?
The TDFS2 can withstand high flow rates and works for setpoint ranges from 0.5 to 10 ft/s (0.15 to 3.0 m/s). As this varies by pipe size, refer to the installation manual for a full flow table by pipe size for exact applicable flow ranges.
Can I use this product for sediment-laden liquids?
The TDFS2 is designed for homogeneous liquids. However, it has no moving parts and can withstand sediment. As long as the installation instructions are followed and the unit is installed in a chemically compatible fluid, the TDFS2 can be used.
What is the current consumption or power consumption for the SFI-800-1/2-A712?
The max current draw is 34mA.
What is the k-factor?
The DFM/DFC have a built-in gas properties database for over 90 different gases and gas mixes. There is no need to use K-factors, which may have 5 to 10% error.
What is the turndown ratio?
Can model P5-1 clear plastic flow switch be used for air flow and if so what is the minimum SCFM air flow to cause the switches to operate?
The Series P5 can only be used for liquids.
How do I read the display?
Start at the top of the register with the Five-Digit Totalizer, and then read clockwise around the small dials. In this example, the Five-Digit Totalizer reads 13800 (138 x 100), and the dials read 0 (0 x 10), 0 (0 x1), and 0 (0 x 0.1) respectively. The total flow is 13800.0.
What are the output options?
What process connections are available?
Are the fittings included?
Yes, the o-rings, nut, and extension fittings are included.
Is this safe to use with drinking water?
This meter is compliant with NSF/ANSI 61. It is up to the customer to decide whether this meter is appropriate for his/her application. We recommend consulting the NSF/ANSI standards for verification.
How many wires are part of the pulsed output?
The cable included with the series is a 3 conductor cable however only the red and black cables require a connection. For specific electrical connection information refer to the product Installation and Operating Instructions
Do you have a flow calculation program that calculates differential pressure from DS400 when given flow rate, temperature & pressure?
Yes you can find the DS Flow Calculator on our website www.dwyer-inst.com under DS In-Line Flow Sensors. On the DS page click on the Apps tab and that will bring you to the Air Velocity and Flow Calculator and Series DS Flow Calculator.
What is the maximum length that you can extend the wire leads?
The maxiumum cable length will vary depending on configuration and power supply; however, a 22 AWG shielded wire at 24V would provide suitable operation for most applications at a length of 328 feet (100 meters).
The incorrect range was ordered in an AVPT; can I re-scale or calibrate this sensor in the field?
The AVPT models are calibrated to a specific range from the factory and cannot be re-ranged in the field.
Are there any advantages to using a BACnet model other than the communications output?
When purchased with the BACnet communication option, the AVPT can display both the air velocity reading and temperature reading from a single device minimizing the need for an additional temperature sensor in the duct.
Can the AVPT output volumetric flow readings
No, the AVPT is configured to output air velocity readings in FPM or M/S only. Consider looking at the AVUL for a unit able to output volumetric air flow.
Is there a valve kit suitable for potable water?
Yes, the stainless steel valve kit is suitable for potable water.
What is included in the valve kit?
The valve kit includes a 1 1/4" ball valve, a reducer, a threadolet, a bushing, and a pipe nipple.
Do I have to purchase an alignment guide separately?
No, every IEF includes an alignment guide.
Why do I have to consult the factory for the high accuracy multi-pipe option?
The multi-pipe option must be calibrated for four different pipe sizes which takes substantially more time.
How long will it take to get a unit that is "out-of-stock"?
10 business days for both standard and high accuracy models.
What is the difference between "Multi-Pipe" and custom configured?
Custom configured IEF's are only compatible with the one particular size they were calibrated for whereas "Multi-Pipe" models are compatible with the multiple size ranges that they were previously calibrated for.
What does the term "Multi-Pipe" mean?
The term Multi-Pipe refers to one IEF unit across multiple pipes. For example, if a high accuracy model is calibrated for 4", 6", 8", and 10" pipe sizes, it can then be used in any or all of the sizes that were previously calibrated.
Does the high accuarcy IEF need to be calibrated any differently then the standard IEF?
Yes, the high accuracy models must be wet calibrated in order to get within 1% of reading.
What pipe sizes are compatible?
All IEF's are compatible with pipe sizes ranging from 4" to 36" outer diameter.
What is the difference between the standard accuracy, the high accuracy, and the custom configuration options?
The standard accuracy is 1% Full Scale, the high accuracy is 1% of reading in pipe sizes ranging from 4" to 10" outer diameter, and the custom configuration is a unit that comes preset for the application or for high accuracy applications where the outer pipe diameter is greater than 10".
Are there any proven results?
No data available currently, but we are working with an outside lab to obtain this data.
Is there a lockout feature to prevent setup changes?
Yes there is a switch that can be activated to ensure complete lockout of the display.
Do you go down to 2” pipe size?
The current minimum pipe size is 3” given customer configuration set up
Is there an adjustable BACnet baud rate?
Yes, baud rates 9600, 19200, 38400, 57600, 76800, or 115200 bps are selectable via the display.
Is there BTU calculation?
In process with a first quarter 2019 release estimate.
Is there a minimum duct size that this sensor can be used in?
The sensing element is about ¾” from the tip of the stem so the duct size would need to accommodate the entire sensing element. If being used in a smaller duct, you will want to verify that the flow range is within the operating range, 1000, 2000, 3000, or 4000 FPM.
Can you use a display with the Modbus or BACnet options?
Yes, either the integral LCD Display, A-AVUL-LCD, or the remote display tool, A-435-A, can be used with Modbus or BACnet configurations.
Is there any additional isolation valve typically required for installing the flowmeters?
The VFCR Visi-Float® flowmeter with roto-gear technology features a fully functional adjustment and control valve, this series also features an easily replaceable valve cartridge that can be effortlessly replaced in the field. An isolation valve inserted on the flow inlet of the flowmeter or bank of flowmeters is good standard practice in order to allow the termination of flow to the unit(s) in the event that the cartridge needed to be replaced.
How do you do traverse readings with a Pitot tube for air velocity and air flow readings?
Dwyer has a guide on how to calculate air velocity and air flow with Pitot Tubes including traverse readings located on our website at: Air Velocity Measurement
Where do I go for help on how to use the SMART Air Hood®?
The Dwyer website is an excellent source for product information. Videos are available illustrating the SMART Air Hood® features and benefits as well as how to use for balancing. In addition to the Dwyer website, the Dwyer Technical Support Team is available to take your phone calls and assist with questions. Please visit www.dwyer-inst.com for contact information and technical support on the SMART Air Hood®.
What type of battery is in the SMART Air Hood®?
The SMART Air Hood® operates with a NCR 18650B MH12210 lithium ion rechargeable battery, 3.6v. In addition, 4 AA batteries can be used as backup so the SMART Air Hood® is always available for use.
Can the SMART Air Hood® accommodate various size diffusers?
Yes, various size canvas hoods with an adaptor are available as accessories for the SAH Consult the Dwyer Instruments website, www.dwyer-inst.com for details.
Can I store my results for future reference?
Yes, the SMART Air Hood® mobile meter includes job based logging that will track the entire balancing process from beginning to end including a balance summary that shows the actual final flow at each register and the deviation from target. Each branch is considered a job. All of the registers for a job can be setup ahead of time and distributed prior to performing the balance. Setup and modifications to the setup can also be done onsite. Jobs can be paused and resumed allowing for additional activities, breaks, maintenance, without disrupting the balancing process.
What is the range of the handheld device that comes with the SAH?
The SAH uses Wi-Fi Direct for communications. Wi-Fi Direct allows the SMART Air Hood® to create a Wi-Fi connection directly to the Dwyer handheld instrument. There is no need for additional equipment needed, like a router. The range is up to 200 yards.
Can it be shipped as air freight to the job?
Yes. The SMART Air Hood® is shipped with a protective carrying case durable enough to be shipped air freight. Please note that there are shipping restrictions for lithium batteries; consult your carrier prior to shipping.
How much does it weigh and what are the dimensions?
Dwyer’s SMART Air Hood® is a revolutionary crate design made from a rugged polymer construction. The lightweight design represents the smallest and most aerodynamic design the industry has ever seen. The SMART Air Hood® weighs less than 6 pounds and ¼ the height of current industry air hoods at 24"x24"x12".
Is a protective case provided for the SMART Air Hood®?
Yes, the SMART Air Hood® is shipped in a protective travel case as standard. The price is included, there is no extra charge.
What is the warranty?
The SMART Air Hood® has a 1 year warranty.
Where do I send the SMART Air Hood® to be calibrated?
Recalibration of the SMART Air Hood® is fast and easy. Dwyer recommends recalibrating the Hood, at a minimum, once a year to ensure maximum performance. When it is time for recalibration, simply detach, by unclipping the clamps on all four sides, the four Quad Flow Sensing Grids along with the Sensor Module. The Quad Flow Sensing Grids and Sensor Module need to be calibrated together. For your convenience, Dwyer includes with each purchase of a SMART Air Hood® a custom return calibration package specifically designed for the four Quad Flow Sensing Grids and Sensor Module. To ensure no downtime, you can purchase a new set of four calibrated Quad Flow Sensing Grids and Sensor Module, model A-SAH-CK part number 100765-09, ready to install on the jobsite. You can return the original four Quad Flow Sensing Grids and Sensor Module in the custom return package to Dwyer using our RMA process or to any authorized Dwyer calibration service company. Once The Quad Flow Sensing Grids and Sensor Module are calibrated, they will be returned as a set back to you, ready to install on your SMART Air Hood®.
What is Quad Flow?
Traditional industry cone shaped air flow hoods experience two main problems when measuring flow registers; poor accuracy of flow readings and back pressure compensation. These factors contribute to wasted energy and poor performance. Dwyer’s patent pending, state of the art, Quad Flow Design concept is based on controlling the recirculating air patterns that can create back pressure effects, while mixing the flow more evenly and efficiently. This well mixed flow for velocity sampling leads to superior measurement accuracy.
What is Predictive Balancing?
The current industry method of balancing is commonly referred to as proportional balancing. Proportional balancing determines the flow between each terminal and the key. The key flow changes with each adjustment of any given terminal, so the balancing technician must estimate a flow for the terminal and adjust the key and the terminal until the correct proportion is achieved. The SMART Air Hood® is designed to provide Predictive Balancing™, an industry first for air flow balancing. Predictive balancing guides the balancing technician on where to go to set the proper flow for each register allowing the system to be fully optimized. The SMART Air Hood® Balancing Instrument includes the PredictAir™ Application Software which reduces the number of steps in the air flow balancing process using Predictive Balancing’s Express Balance mode. Predictive Balancing is a method of predicting the optimal flow set point for each register and the order in which they should be adjusted.
Why should I buy a SMART Air Hood®?
The SERIES SAH SMART Air Hood® Balancing Instrument is the most accurate and easy to operate air flow hood on the market. By using the included hood stand and wireless communications to the handheld, a single operator can balance a branch in less time than traditional balancing teams. Besides being lighter than most traditional capture hoods, the ergonomic design makes the Series SAH easy to maneuver, with less physical stress. The rugged polypropylene base hood features patented Quad Flow Design Technology for controlling air flow and minimizing back pressure, which yields superior measurement accuracy. The Wi-Fi direct communication gives reliable communication with a distance of up to 200 yards between the hood and the handheld test instrument.
I have four Series 475 Mark III Handheld Digital Manometers that we have had for one year. I would like to have them calibrated, but I do not know where to send them. Do you offer a calibration service for the products you sell?
Yes, we provide NIST calibration for the 475 series both at the time of purchase and afterwards. Please contact one of our customer service representatives at 1-800-872-9141 and provide them with your model number(s).
I have an application where i need to check permanently the velocity in a metal duct (16" diameter) the application is metal cutting (cutting with plasma machine. I am selecting the following items. Series 160S Pitot Tubes and Series DM-1200 DigiMag® Digi
The 160S pitot tube is specifically designed for flow measurement of dirty, particulate laden gas or air so a bit of dust should not be an issue for your application.
What is the best method of measuring actual air flow in process ducts to verify process air flow sensors (differential pressure sensors, air flow stations, etc.)
There are two ways to measure air flow in process ducts. The most common means is the use of a Series 2000 Magnehelic® Differential Pressure Gage. This gage can be ordered with a square root output that will read in flow units. You will have to specify the maximum differential pressure at your desired flow rate. Along with the gage, a pitot tube (connected by means of rubber or vinyl tubing) is also used. The pitot tube must be pointed directly into the air stream. Care must be taken to ensure that the pitot tube should be inserted at least 8-1/2 duct diameters downstream from elbows, bends or other obstructions which cause turbulence. The alternative method uses a 100 AV Durablock® Air Velocity Gage kit. The kit includes a manometer, a stainless steel pitot tube, rubber tubing with connectors, and red gage fluid. The pitot tube, pointed directly into the air stream, senses total and static pressure. The manometer then senses velocity pressure (difference between total and static pressure).
The gland fitting A-159 is shown as an accessory to the Series 160 Pitot tube. How do you install the fitting past the elbow in the tube?
The optional mounting gland, model A-159, is designed to slide over any Series 160, 5/16” diameter standard pitot tube. It should be large enough to slide past the elbow while still being small enough to tighten down on the 5/16” diameter shaft.
We have recently replaced a Dwyer air velocity transmitter (PFS1300204) with a Dwyer Series 641. The new sensor works fine for only a few days and then starts reading almost no flow. These devices are used in an Air Scrubber application (exhaust stack). I
I do not think you are using the 641 series air velocity transmitter in an appropriate application. Any moisture or particulates in the exhaust could be causing damage to the hot wire sensor, leading to the failure. The difference in the sensors is probably why you got longer life out of the PFS series, which unfortunately, is no longer available. The PFS series used a glass filled polyester sensor, which is a little more robust and can with stand the elements a little better. In your specific application, you might take a look at our 641B series which uses a heated mass flow sensor which can be used in dirty air environments.
My quesiton is regarding PAFS-1000 series averaging flow sensor. Is the K factor provided in the instruction manual a direct multiplier to the velocity measured? i.e. v_actual = v_measured * K.
You are correct. V_actual = V_measured * K.
Can the Vaneometer model 480 be equipped with a scale to read in inches of water? We want to use the vaneometer to assure we have a pressure differential of -0.01 wc when measured at the door gap to a patient isolation room.
The series 480 does not come with a scale reading in inches w.c., the scales would be in velocity units to read air velocity. However, we do have differential pressure gages or manometers than can be used to measure the differential pressure in an inches w.c. scale. I would recommend taking a look at our Series 2000 Magnehelic® Differential Pressure Gage, as we do have many customers use these for clean room applications. We have the model number 2000-00N which has a range of 0-0.2. and the major grads will be 0.01” w.c.
On your Flow Switches, which model has a Form C type contact
Form C contact is a SPDT snap switch. Many of Dwyer’s flow switches have SPDT snap switches. The V4, V6, V7, FS-2, and V8 are some of them.
Can the V10 flow switch be mounted for use in a vertical up-flow application?
Yes. The standard V10 has a spring return on the vane which allows for mounting in any position.
Can the V8 float switch be used with acids due to its material of construction?
No. The V8 contains a 316SS pin and spring as well as a ceramic 8 magnet that are not compatible.
What does actuation and de-actuation mean?
Actuation means that the flow rate has reached a point where the microswitch trips or the contacts of the microswitch change state. De-actuation means that the flow rate has decreased to a point where the microswitch returns to its normal state.
If a customer claims the plastic impeller dissolved in plain water, what probably happened?
The customer exposed the sight flow indicator to fluid temperatures of 400-500 degrees Fahrenheit, considerably in excess of the published temperature specification.
If a customer complains the impeller in his sight flow indicator is not turning, what is most likely the problem?
Usually the impeller is fouled or the indicator is doing its job and actually indicating no flow.
What type of pressure drop is expected in the V6-LF?
5-15 psi, however, it will vary in proportion to the flow rate.
Why should a customer be discouraged from buying a V6 without a tee and installing it in his own tees?
Two reasons: One, the customer will frequently tighten the body in the tee one turn too many, resulting in the vane hitting the tee. This bends the vane and it can jam up even after the switch is backed out one turn to its proper position. Two, there is also a wide variation in tee dimensions between manufacturers which aggravates the problem.
Are custom vanes for the V6 available?
Yes, we can supply customer vanes for the V6. The information we would require is as follows: pipe size, flow direction (horizontal, up, down), mounting, pressure, temperature, specific gravity, flow rates (maximum normal, actuation/de-actuation). Please see custom vane option in the online configurator.
What is the pressure drop across a V6 Flow switch?
Pressure drop (head loss) is a function of both set point and flow rate. Typically, pressure drop at actuation flow rate listed will be 5 – 10 PSID (0.34 – 0.69 Bar). Pressure drops at other flow rates will vary in proportion to the change in flow.
What material is used as a seal between the process fluid and the electrical portion of the switch?
The body material; as there is no separate "seal" since the body is machined from solid stock and the switch is magnetically actuated.
What precautions should be taken when installing a V4 switch in an extremely high flow application?
Installation with a 2 1/2" threaded branch connection is recommended to allow the vane to swing out almost parallel to the flow to reduce stress on the vane and pressure drop in the system.
Can a V4 switch be installed in a vertical run of pipe?
Yes, but not the standard model. Vertical pipe installations must be specified on the order and require a special spring loaded vane. Only for use in vertical up-flow applications. Please see option -V in online configurator.
How is "deadband" defined as related to the V4 switch?
Deadband is the difference between the switch actuation flow and switch deactuation flow; in general, V4 flow switches have a 45% deadband meaning deactuation occurs at approximately 55% of actuation flow.
Why is the method of mounting a V4 of concern?
The vane and magnet keeper assembly near the hinge pin are very close to the mounting threads. Combined with the fact that pipe fittings are available in many variations, this produces a possibility that the customer will mount the switch in a fitting that prevents the vane from swinging. To make things worse, there is usually no way the customer can tell that this has happened. Mounting in a threaded branch connection avoids this clearance problem.
What precautions should be taken when making an outdoor installation?
Keep the junction box above the nearest low point in the conduit run and make sure the conduit connection is sealed to prevent condensation from running into the switch.
