DN Series Vortex Flow Sensor
Frequency Output, 1/4" to 1.0" Pipe Sizes, Rugged Molded PPA Construction
DESCRIPTION
The DN series vortex flow transmitters are designed with equipment manufacturers in mind and are an excellent economical choice for system flow monitoring and control.
The DN series vortex flow transmitters are designed with equipment manufacturers in mind and are an excellent economical choice for system flow monitoring and control.
The transmitters work on the principle of Kármáns vortex trail, named after Theodore von Kármán's mathematical description of the phenomenon. Vortex shedding flowmeters present the flow in a pipe with an obstruction/bluff in the flowmeter body. As velocity increases, alternating vortices are formed on each side of the bluff body and travel downstream.
The DN series utilize piezoelectric sensors embedded in a ETFE vane located downstream of the bluff to detect the generated vortices. The frequency measured represents the flow velocity. A flow factor is provided to convert frequency to volume flow rate for each model size.
The minimum measured flow rate is dependent on the viscosity of the fluid.
Versions with a 1000 Ohm RTD temperature sensor built-in to the bluff are available.
FEATURES
- Low cost product with high levels of accuracy
- Temperature in-sensitive measuring principle
- Excellent media resistance (measuring element not in contact with the media)
- Minimal pressure loss
- Measuring element not sensitive to debris
- Direct temperature measurement in the medium
SPECIFICATIONS
Medium: Suitable for water & water glycol based heat exchange systems with the usual additives and other fluids compatible with the materials of construction (consult factory). For media with viscosity greater than 2 millipascal seconds (2 centipoise), higher flow rates are required to form vortices raising the minimum measurable flow rate value. Flow ranges: From 0.24 to 39.6 GPM (0.9 ... 150 litres per minute). See model table 1. Temperature measurement: Optional PT1000 RTD imbedded in flow sensor bluff Measure range -40°F to +302°F (-40 to > +150 °C) 1000.00 Ohm @ 32°F (0°C) 1573.25 Ohm @ 302°F (150°C) Temperature: Ambient: 5° to185°F (-15 to + 85°C) In storage: -22° to 185°F (-30 to + 85°C) Max. pressures and medium temperature:
| psi | bar | °F | °C | Duration |
| 174 | 12 | 104 | 40 | Lifetime |
| 87 | 6 | 212 | 100 | Lifetime |
| 58 | 4 | 257 | 125 | 600 hours |
| 58 | 4 | 284 | 140 | 2 hours |
Max. test pressure: 261 psi/18 bar at 104°F/40°C Loss of pressure / cavitation: A minimum inlet pressure of 10.2 psi (0.7 bars) is required to avoid cavitation issues at maximum flow. Wetted materials: Sensor vane: ETFE Sealing material: EPDM Flow sensor and bluff: ASTM- PPA, Polyphthalamide ISO-PA6T/6I, Grivory 40%GF Power supply:5 VDC (4.75 to 5.25) Output: Square pulse frequency 0 / 5 VDC (The signal frequency depends on the nominal diameter, see order) Signal amplitude at UIN=5.0 V:Load > 10 kOhm against IN < 0.1 … 5.0 V Current consumption: < 4 mA Response time: A high accuracy of flow rate is detected within 100 ms. Electrical connection: 3-pole connector (without temperature output), RAST 2.5 (AMP DUO PLUG 2.5™ is recommended mating connector.) M12x1, 5-pole circular receptacle provided for temperature output option. See accessories for cable assembly offerings Polarity reversal protection: Mechanically protected Protection class: IP20, IP65 (M12x1 only) Mounting position: In principle universal. We recommend that, when the sensor is mounted in horizontal pipe runs that the electrical connection/sensor assembly be mounted off vertical (3 o'clock or 9 o'clock best). Piping connection fittings: See tables 4-6 for standard selection of types & sizes. Special fittings can be produced by Clark or the customer. Accuracy: Accuracy specifications are valid for media with a viscosity <2 centipoise (2 millipascal seconds): For water in temperature range 41 to 212°F (5 to 100°C) or for water with maximum 20% glycol at >77°F (>25°C) Up to 50% fs: < 1% fs From 50% fs: < 2% of measured value Temperature measurement accuracy: PT 1000 for DIN EN 60751 Class B ± 0.8°F @ 68°F (± 0.45°C @ 20°C) ±1.4°F @ 190°F (± 0.75°C @ 90°C) Weight (Without End Fittings): DN 8 approx. 0.10 lbs (47 g) DN 10 approx. 0.13 lbs (57 g) DN 15 approx. 0.15 lbs (68 g) DN 20 approx. 0.20 lbs (92 g) DN 25 approx. 0.22 lbs (100 g) Packaging: Packaged singly (standard) or in multiple blister packs Blister packs: DN 8, 10 and 15 Blister packs each containing 30 pcs DN 20 and 25 Blister packs each containing 20 pcs
Models - Table 1
| Model | Pipe Size | Full Scale Range (Gal/min) | Full Scale Range (l/min) | Approximate Frequency Range (Hz) | Calibration Factor/Formula Q= volume flow in LPM f=Hz |
| DN8 | 1/4" | 0.238 to 3.96 | 0.9 to 15.0 | 34 to 437 | Q= 0.035*f-0.3 |
| DN10 | 3/8" | 0.476 to 8.45 | 1.8 to 32.0 | 24 to 382 | Q= 0.0845*f-0.2 |
| DN15 | 1/2" | 0.925 to 13.20 | 3.5 to 50.0 | 19 to 269 | Q= 0.187*f-0.2 |
| DN20 | 3/4" | 1.32 to 22.50 | 5.0 to 85.0 | 14 to 229 | Q= 0.373*f-0.3 |
| DN25 | 1" | 2.38 to 39.6 | 9.0 to 150.0 | 12 to 202 | Q= 0.744*f-0.2 |
Correction of calibration factor as a result of adding glycol to water: No correction is needed to maintain stated accuracies for water with maximum 20% glycol at >77°F (>25°C). For higher concentrations of glycol be guided by the below charts and formulae to correct the calibration factor. Calibration Formula: Q= k*f+Qo Q= Flow Rate (l/min) k= Flow sensor calibration factor f= Frequency Qo= Viscosity correction
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Table 2 Correction of calibration factor cont'd
| Q= k*f+Q | Qmin= n*Qmin | |||
| Model | k | Qo | Qmin (Water) | |
| DN8 | 0.035 | -0.3 | 0.9 l/min | |
| DN10 | 0.0845 | -0.2 | 1.8 l/min | |
| DN15 | 0.187 | -0.2 | 3.5 l/min | |
| DN20 | 0.373 | -0.3 | 5.0 l/min | |
| DN25 | 0.744 | -0.2 | 9.0 l/min | |
| Example 1: Model DN with water | Example 2: Model DN, water with 30% glycol at 32°C | |||
| Q= 0.187*f-0.2 | Q= 0.187*f-0.5 | |||
| Qmin= 3.5 l/min | Qmin= 1.7*3.5=5.95 l/min | |||
| (Multiply liters x 0.264 to convert to gallons) | (Multiply liters x 0.264 to convert to gallons) | |||
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Table 3
| Dimensions do not include fittings- see following tables for standard fitting offerings | ||||||
| Model | A inches(mm) | B inches(mm) | C inches(mm) | D inches(mm) | E inches(mm) | f inches(mm) |
| DN8 | 2.83 (72) | 1.16 (29.5) | 1.30 (32.9) | 2.32 (59) | 1.19 (30.2) | 1.14 (28.9) |
| DN10 | 3.03 (77) | 1.28 (32.5) | 1.30 (32.9) | 2.26 (57.3) | 1.19 (30.2) | 1.14(28.9 ) |
| DN15 | 3.23 (82) | 1.28 (32.5) | 1.54 (39) | 2.46 (62.4) | 1.19 (30.2) | 1.30 (33) |
| DN20 | 4.13 (105) | 1.55 (39.3) | 1.19 (43) | 2.61 (66.3) | 1.19 (30.2) | 1.47 (37.4) |
| Model | A inches(mm) | B inches(mm) | C inches(mm) | D BSPP Female Pipe Thread |
| DN25 | 120 (4.72) | 1.97 (50) | 2.69 (68.3) | G1 1/4 |
PIPING CONNECTIONS
The DN series offers great flexibility with respect to piping connections. Inserting and removing fittings for pipe sizes to 3/4" is easy. A clip secures the end fitting to the flow sensor and an o-ring provides the seal. OEM clients may wish to produce fittings according to their own design needs. The 1" size model (VFS100) has metric G1 1/4 female threads molded integral to the sensor body. 1" NPT 304 SS adaptors are available (see table 5).
THREADED ADAPTERS
Table 4: Stainless Threaded Adaptors
(1/4"-3/4" NPT) & Clip Table
| Model | Clip Part Number | O-Ring Part Number (Material) | Threaded Adapter Part Number | *Material | A | B inches (mm) | C inches (mm) | **D inches (mm) | E inches (mm) | F inches (mm) | g inches (mm) | H inches (mm) |
| DN8 | C810 | R810E (EPDM) | ADS1/4 | 303 SS | 1/4" NPT | 1.76 (44.65) | 2.27 (57.65) | 0.551 (14) | 1.14(29 ) | 0.965 (24.5) | 0.236 (6) | 1.21 (30.8) |
| DN10 | C810 | R810E (EPDM) | ADS3/8 | 303 SS | 3/8" NPT | 1.87 (47.55) | 2.35 (59.65) | 0.551 (14) | 1.142 (29) | 0.965 (24.5) | 0.236 (6) | 1.21 (30.8) |
| DN15 | C15 | R15E (EPDM) | ADS1/2 | 303 SS | 1/2" NPT | 1.97 (50.05) | 2.64 (67.05) | 0.646 (16.4) | 1.260 (32) | 1.1 (28) | 0.191 (4.85) | 1.36 (34.5) |
| DN20 | C20 | R20E (EPDM) | ADS3/4 | 303 SS | 3/4" NPT | 2.32 (58.85) | 3.36 (85.25) | 0.731(18.6 ) | 1.499 (37.8) | 1.1 (28) | 0.315 (8) | 1.36 (34.5) |
| *Contact us for other materials or details on how to make your own fittings | ||||||||||||
| **The overall length of the flow sensor is increased by approximately twice this value | ||||||||||||
Table 5: Stainless Threaded Adaptors - 1" NPT
| DN25 Threaded Fitting Adapters- G1-1/4 Male to 1" NPT Female | ||
| O-Ring | ||
| Part Number | Material | Part Number |
| (Material) | ||
| ADSG1N | 303 stainless steel | R25E (EPDM) |
Table 6: Brass Solder Adaptors
| Model | Clip Part Number | O-Ring Part Number (Material) | Adapter Part Number | Material | Standard Tubing Size (For Use With Type K & Type L Copper Tubing) |  |
| DN8 | C810 | R810E (EPDM) | SADB1/4 | 360 Brass | 1/4" | |
| DN10 | C810 | R810E (EPDM) | SADB3/8 | 360 Brass | 3/8" | |
| DN15 | C15 | R15E (EPDM) | SADB1/2 | 360 Brass | 1/2" | |
| DN20 | C20 | R20E (EPDM) | SADB3/4 | 360Brass | 3/4" |
 |
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PRESSURE LOSS
ORDERING INFORMATION
ORDER FLOW SENSOR MODEL FROM TABLE 7
EXAMPLE: DN15ADS1/2R15EC15RTD
ORDER ACCESSORIES AND COMPONENT PARTS FROM TABLE 8
| Flow Sensor Order Table | |||
| PLEASE CALL 1-800-253-2497 TO ORDER THESE ITEMS | |||
| A=Model | B=Connection Adapter (Two Supplied ) |
C=O-rings (Two Supplied) |
D=Adapter Clips (Two Supplied) |
| DN8 | N=None OR Select from Table 4 or Table 6 |
N=None OR Select from Table 4 or Table 6 |
N=None OR Select from Table 4 or Table 6 |
| DN10 | |||
| DN15 | |||
| DN20 | |||
| DN25 | N=None OR Select from Table 5 |
N=None OR Select from Table 5 |
N=None |
| Options | |||
| RTD= PT1000, 1000 ohm, class B platinum resistance temperature detector | |||
Table 8
| Component Parts | ||
| Part Number | Description | |
| Electrical | ||
| ECAD2.530 | Amp Duoplug 2.5, 3-pole plug with 11.80" (30 cm) cable | |
| ECAD2.5110 | Amp Duoplug 2.5, 3-pole plug with 43.3" (110 cm) cable | |
| ECM12S | M12x1 straight circular connector, 5 pole plug with 78.7" (200 cm) cable | |
| Fitting Clips | ||
| C810 | For DN8 and DN10 | |
| C15 | For DN15 | |
| C20 | For DN20 | |
| O-Rings | ||
| R810E | EPDM, AS568-113 | |
| R15E | EPDM, AS568-909 | |
| R20E | EPDM, AS568-118 | |
| R25E | EPDM, AS568-223 | |
| Connection Adapter Fittings- Threaded | ||
| ADS1/4 | Model DN8 Stainless Steel Adapter, 1/4" NPT Female | |
| ADS3/8 | Model DN10 Stainless Steel Adapter, 3/8" NPT Female | |
| ADS1/2 | Model DN15 Stainless Steel Adapter, 1/2" NPT Female | |
| ADS3/4 | Model DN20 Stainless Steel Adapter, 3/4" NPT Female | |
| ADSG1NPT | Model DN25 Stainless Steel Adapter, 1" NPT Female | |
| Connection Adapter Fittings- Soldered | ||
| SADB1/4 | Model DN8 to 1/4” copper tubing | |
| SADB3/8 | Model DN10 to 3/8” copper tubing | |
| SADB1/2 | Model DN15 to 1/2” copper tubing | |
| SADB3/4 | Model DN20 to 3/4” copper tubing | |
