Flowmeters
Flowmeters indicate flow rate. The different sensors include dial, in-line, ultrasonic, orifice plate, totalizing meters, variable area, venturi, or with switch output. The different designs of the flowmeters have a variety of applications.
MOST POPULAR
Questions
- Question
- How are Dwyer flowmeters properly read?
- Answer
- The flow rate is read at the maximum width portion of the float regardless of shape.
- Question
- What factor is used to correct for different flowmeter inlet pressure?
- Answer
- If the flowmeter is exhausting to atmosphere, no correction factor is needed. If back-pressure is present due to downstream plumbing or restrictions, this error can be corrected utilizing the conversion curves in our full-line catalog or the following equation.
Pressure: Q2 = Q1 x √((P1 x T2)/(P2 x T1))
Where:
Q1 = Observed Flowmeter Reading
Q2 = Standard Flow Corrected for Specific Gravity
P1 = Actual Pressure (14.7 psia + Gage Pressure)
P2 = Standard Pressure (14.7 psia, which is 0 psig)
T1 = Actual Temperature (460 R + Temp °F)
T2 = Standard Temperature (530 R, which is 70°F)
- Question
- Why are top mounted valves recommended for flowmeters used for vacuum service?
- Answer
- To maintain atmospheric pressure in the indicating bore and therefore preserve accuracy; an inlet restriction would reduce pressure in the bore. This is essentially the opposite situation to outlet back-pressure in a pressure system which increases pressure in the bore and also affects accuracy. Remember that all standard Dwyer flowmeters are calibrated for standard atmospheric pressure and temperature in the bore.
- Question
- Is the Rate-Master® or Visi-Float® Flowmeter compatible with any media?
- Answer
- The Rate-Master® Flowmeter is manufactured from a polycarbonate plastic and the Visi-Float® Flowmeter is manufactured from acrylic. Compatibility charts need to be reviewed to determine if these materials of construction are compatible with your media.
- Question
- Are special ranges available for the Rate-Master® and/or Visi-Float® Flowmeter?
- Answer
- Yes, other ranges are available which are not specified in our catalog. Please feel free to contact Dwyer with questions on these ranges.
<h2>Videos</h2>
<div class="row">
<div class="col-sm-4">
<dl class="rounded image-block bottom medium metallic">
<dt class="title">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=2520299486001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Fix your Flow Specific Gravity and Pressure Corrections for Variable Area Flowmeters (Episode 4)</pre>">
<strong style="color: #990000;">Fix your Flow Specific Gravity and Pressure Corrections for Variable Area Flowmeters (Episode 4)</strong>
</a>
</dt>
<dd class="image">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=2520299486001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Fix your Flow Specific Gravity and Pressure Corrections for Variable Area Flowmeters (Episode 4)</pre>">
<img src="https://brightcove04.o.brightcove.com/1567367896001/1567367896001_3578169620001_VariableAreaFC-642x360.jpg?pubId=1567367896001" border="0">
</a>
</dd>
</dl>
</div>
<div class="col-sm-4">
<dl class="rounded image-block bottom medium metallic">
<dt class="title">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=2920197900001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Variable Area Flowmeters</pre>">
<strong style="color: #990000;">Variable Area Flowmeters</strong>
</a>
</dt>
<dd class="image">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=2920197900001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Variable Area Flowmeters</pre>">
<img src="https://brightcove04.o.brightcove.com/1567367896001/1567367896001_3578227521001_VariableAreaFC-642x360.jpg?pubId=1567367896001" border="0">
</a>
</dd>
</dl>
</div>
<div class="col-sm-4">
<dl class="rounded image-block bottom medium metallic">
<dt class="title">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=3271962170001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Series RM Rate-Master Flowmeter</pre>">
<strong style="color: #990000;">Series RM Rate-Master Flowmeter</strong>
</a>
</dt>
<dd class="image">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=3271962170001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Series RM Rate-Master Flowmeter</pre>">
<img src="https://brightcove04.o.brightcove.com/1567367896001/1567367896001_3271978425001_RM-642x360.jpg?pubId=1567367896001" border="0">
</a>
</dd>
</dl>
</div>
<div class="col-sm-4">
<dl class="rounded image-block bottom medium metallic">
<dt class="title">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=3266763472001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Series VFA and VFB Visi-Float Flowmeter</pre>">
<strong style="color: #990000;">Series VFA and VFB Visi-Float Flowmeter</strong>
</a>
</dt>
<dd class="image">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=3266763472001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Series VFA and VFB Visi-Float Flowmeter</pre>">
<img src="https://brightcove04.o.brightcove.com/1567367896001/1567367896001_3266783679001_VF-642x360.jpg?pubId=1567367896001" border="0">
</a>
</dd>
</dl>
</div>
<div class="col-sm-4">
<dl class="rounded image-block bottom medium metallic">
<dt class="title">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=2805510885001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Flow Measurement with Orifice Plates</pre>">
<strong style="color: #990000;">Flow Measurement with Orifice Plates</strong>
</a>
</dt>
<dd class="image">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=2805510885001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Flow Measurement with Orifice Plates</pre>">
<img src="https://brightcove04.o.brightcove.com/1567367896001/1567367896001_3578219661001_OrificePlates-642x360.jpg?pubId=1567367896001" border="0">
</a>
</dd>
</dl>
</div>
<div class="col-sm-4">
<dl class="rounded image-block bottom medium metallic">
<dt class="title">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=5253771072001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Visi-Float Acrylic Flowmeter with Roto-Gear Valve Technology</pre>">
<strong style="color: #990000;">Visi-Float Acrylic Flowmeter with Roto-Gear Valve Technology</strong>
</a>
</dt>
<dd class="image">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=5253771072001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Visi-Float Acrylic Flowmeter with Roto-Gear Valve Technology</pre>">
<img src="https://brightcove04.o.brightcove.com/1567367896001/1567367896001_5253790181001_5253771072001-vs.jpg?pubId=1567367896001" border="0">
</a>
</dd>
</dl>
</div>
<div class="col-sm-4">
<dl class="rounded image-block bottom medium metallic">
<dt class="title">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=3769020893001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Series DFMT and DFMT2 Digital Paddlewheel Flow Transmitters</pre>">
<strong style="color: #990000;">Series DFMT and DFMT2 Digital Paddlewheel Flow Transmitters</strong>
</a>
</dt>
<dd class="image">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=3769020893001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Series DFMT and DFMT2 Digital Paddlewheel Flow Transmitters</pre>">
<img src="https://brightcove04.o.brightcove.com/1567367896001/1567367896001_3769051510001_DFMT-DFMT2-642x360.jpg?pubId=1567367896001" border="0">
</a>
</dd>
</dl>
</div>
<div class="col-sm-4">
<dl class="rounded image-block bottom medium metallic">
<dt class="title">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=5253746487001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Visi-Float Acrylic Flowmeter w/ Roto-Gear Valve Technology: Series VFCR</pre>">
<strong style="color: #990000;">Visi-Float Acrylic Flowmeter w/ Roto-Gear Valve Technology: Series VFCR</strong>
</a>
</dt>
<dd class="image">
<a href="https://link.brightcove.com/services/player/bcpid1567305090001?bckey=AQ~~,AAABbO5oG8E~,ZpNpd8PFcCdrLszogCAUhtUYwv8TlmGo&bctid=5253746487001&iframe=true&width=490&height=290" rel="prettyPhoto" title="<pre>Visi-Float Acrylic Flowmeter w/ Roto-Gear Valve Technology: Series VFCR</pre>">
<img src="https://brightcove04.o.brightcove.com/1567367896001/1567367896001_5253785035001_5253746487001-vs.jpg?pubId=1567367896001" border="0">
</a>
</dd>
</dl>
</div>
</div>