Dwyer Series V6 Flotect® Flow Switch

Specifications - Installation and Operating Instructions

Bulletin E-22

Product Overview

The Series V6 Flotect® Flow Switch is an inexpensive, explosion-proof flow switch designed for use with air, water, or other compatible gases and liquids. It offers three configurations: factory-installed in a tee, with a trimmable vane for field adjustment, or low-flow models with an integral tee and adjustable valve. All models are available with an optional enclosure that is UL and CSA listed, or Directive 2014/34/EU (ATEX) compliant.

The switch is suitable for hazardous locations and meets stringent safety standards, including ATEX and IECEx certifications for specific process temperature ranges.

Installation Instructions

General Installation:

Unpack and remove any packing material from the lower housing or tee.
The switch can be installed in any position, but actuation/deactuation flow rates listed in charts are based on horizontal pipe runs and are nominal values. For precise settings, factory calibration is recommended.

V6 Models with Tee:

Supplied in 1/2" - 2" NPT sizes.
Install in piping with the arrow pointing in the direction of flow.

V6 Low Flow Models:

Feature 1/2" NPT connections and are field adjustable.
Install with the arrow pointing in the direction of flow.
To adjust, loosen the four socket head cap screws on the bottom. The adjustment valve rotates 90° between "O" (open) and "C" (closed). Refer to flow charts for approximate ranges. Tighten screws once the desired flow rate is set.

V6 with Field Trimmable Vane:

Allows installers to select approximate actuation/deactuation points by trimming the vane at letter-designated marks on a removable template.
Install in piping with the arrow pointing in the direction of flow.
When using bushings, they must be back-drilled to allow proper clearance for unrestricted vane travel. Bore the I.D. to 13/16" (20 mm) for 1/2" x 3/4" bushings or 1" (25 mm) for larger bushings. Ensure the bore depth leaves internal threads 9/16" (14 mm) high for proper engagement. Verify vane travel and switch operation after installation.

Electrical Connections

Connect wire leads in accordance with local electrical codes and the required switch action.

Normally Open (N.O.) contacts close, and Normally Closed (N.C.) contacts open when flow increases to the actuation point. They return to their "normal" condition when flow decreases to the deactuation point.
Wire identification: Black = Common, Blue = Normally Open, Red = Normally Closed.

Grounding: For units with internal and external bonding terminals, use the internal ground screw to ground the control. The external bonding screw is for supplementary bonding as permitted or required by local code. If an external bonding conductor is required, wrap it at least 180° around the external bonding screw. Some CSA models include a separate green ground wire and require a junction box (not supplied).

Diagram shows details of electrical connection components: screw, clamp, conductor, washer.

Specifications

Parameter	Details
Service	Gases or liquids compatible with wetted materials.
Wetted Materials	Vane: 301 SS; Lower body: Brass or 303 SS; Magnet: Ceramic; Tee: Brass, iron, forged steel, or 304 SS. Low flow models may use Buna-N O-rings (fluoroelastomer optional).
Temperature Limits	-4 to 220°F (-20 to 105°C) Standard. MT high temp option: 400°F (205°C) (MT not UL, CSA, ATEX, IECEx or KC). Ambient: -4 to 167°F (-20 to 75°C). Process: -4 to 220°F (-20 to 105°C).
Pressure Limit	Varies by model and material (e.g., Brass tee models: 250 psi; Stainless steel tee models: 2000 psi).
Enclosure Rating	Weatherproof and explosion-proof. UL/CSA listed for Class I, Groups A, B, C, D; Class II, Groups E, F, G.
Certifications	UL, CSA, ATEX (CE 2813 II 2 G Ex db IIC T6 Gb), IECEx (Ex db IIC T6 Gb), Korean KC. Specific temperature classes (T6, T5, T4) depend on process/ambient conditions.
Switch Type	SPDT snap switch standard; DPDT optional.
Electrical Rating	UL models: 5A @125/250 VAC. CSA, ATEX, IECEx models: 5A @ 125/250 VAC (V~); 5A res., 3A ind. @ 30 VDC (V). MV option: 0.1A @ 125 VAC. MT option: 5A @125/250 VAC.
Electrical Connections	UL models: 18 AWG, 18" (460 mm) leads. ATEX/CSA/IECEx models: Terminal block.
Conduit Connections	3/4" male NPT standard; 3/4" female NPT on junction box models. M25 x 1.5 with BSPT option.
Process Connection	1/2" male NPT on models without a tee.
Mounting Orientation	Any position; flow rates in charts are for horizontal runs.
Set Point Adjustment	Standard models: None. Field trimmable vane or adjustable valve on low-flow models.
Weight	2 to 6 lb (0.9 to 2.7 kg) depending on construction.
Options	Custom calibration, bushings, PVC tee, reinforced vane, DPDT relays, etc.

Note: ATEX, IECEx, and KC units have specific installation requirements regarding cable entry and conduit seals for hazardous area compliance.

Model Chart

The following chart details the model number configuration:

Example	Series	Construction	Body	Switch Type	Tee Connection Size	Tee Type and Material	Options
V6 EP -BB -D -1 -B-AT	V6	EP	BB (Brass) / SS (Stainless Steel)	D (DPDT) / S (SPDT)	1 (1/2" NPT) to 6 (2" NPT), LF (Low Flow), 1E-6E (BSPT sizes)	B (Brass) / S (Stainless Steel) / SO (No Tee)	AT (ATEX), BUSH (Bushing types), CSA, CV, FTR, GL, ID, IEC, JCTLH, KC, MT, MV, NN, ORFB, ORFS, PT, RV, ST, TBC, VIT
V6EPB-B-D-1-B-AT	V6	EP	BB (Brass) / SS (Stainless Steel)	D (DPDT) / S (SPDT)	1 (1/2" NPT) to 6 (2" NPT), LF (Low Flow), 1E-6E (BSPT sizes)	B (Brass) / S (Stainless Steel) / SO (No Tee)	AT (ATEX), BUSH (Bushing types), CSA, CV, FTR, GL, ID, IEC, JCTLH, KC, MT, MV, NN, ORFB, ORFS, PT, RV, ST, TBC, VIT

Attention: Units without the "AT" suffix are not Directive 2014/34/EU (ATEX) compliant and are not intended for use in potentially hazardous atmospheres in the EU.

Flow Rate Charts

Approximate actuation/deactuation flow rates are provided for various conditions and configurations. Values are listed as GPM (upper) / M³/HR (lower) for liquids and SCFM (upper) / NM³/M (lower) for air.

V6 With Tee

Cold Water - Factory Installed Tee
Vane	1/2" NPT	3/4" NPT	1" NPT	1-1/4" NPT	1-1/2" NPT	2" NPT
Full Size	1.5 (0.34)	1.0 (0.23)	2.0 (0.45)	1.25 (0.28)	3.0 (0.68)	1.75 (0.40)	4.0 (0.91)	3.0 (0.68)	6.0 (1.36)	5.0 (1.14)	10.0 (2.27)	8.5 (1.93)

Air - Factory Installed Tee
Vane	1/2" NPT	3/4" NPT	1" NPT	1-1/4" NPT	1-1/2" NPT	2" NPT
Full Size	6.5 (0.18)	5.0 (0.14)	10.0 (0.28)	8.0 (0.23)	14 (0.40)	12 (0.34)	21 (0.59)	18 (0.51)	33 (0.93)	30 (0.85)	43 (1.19)	36 (1.02)

V6 Low Flow, Field Adjustable

Cold Water - Low Flow Models
	Minimum	Maximum
GPM / M³/HR	0.04 (0.009)	0.75 (0.17)

Air - Low Flow Models
	Minimum	Maximum
SCFM / NM³/M	0.18 (0.005)	2.70 (0.08)

V6 With Field Trimmable Vane

Cold Water - Brass or Cast Iron Reducing Tee
Vane	1/2" NPT	3/4" NPT	1" NPT	1-1/4" NPT	1-1/2" NPT	2" NPT
Full Size	9.0 (2.0)	8.5 (1.9)	9.5 (2.2)	9.0 (2.0)	10.0 (2.3)	9.3 (2.1)	11.0 (2.5)	10.0 (2.3)	6.2 (1.4)	5.5 (1.2)	12.0 (2.7)	10.0 (2.3)
a	9.5 (2.2)	9.0 (2.0)	10.0 (2.3)	9.3 (2.1)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	6.2 (1.4)	5.5 (1.2)	12.0 (2.7)	10.0 (2.3)
b	10.0 (2.3)	9.3 (2.1)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	6.2 (1.4)	5.5 (1.2)	12.0 (2.7)	10.0 (2.3)
c	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	6.2 (1.4)	5.5 (1.2)	12.0 (2.7)	10.0 (2.3)
d	6.2 (1.4)	5.5 (1.2)	12.0 (2.7)	10.0 (2.3)	7.0 (1.6)	6.5 (1.5)	13.0 (3.0)	11.0 (2.5)	4.3 (1.0)	3.9 (0.9)	7.6 (1.7)	7.1 (1.6)
e	7.0 (1.6)	6.5 (1.5)	13.0 (3.0)	11.0 (2.5)	4.3 (1.0)	3.9 (0.9)	7.6 (1.7)	7.1 (1.6)	4.9 (1.1)	4.4 (1.0)	8.0 (1.8)	7.3 (1.7)
f	4.3 (1.0)	3.9 (0.9)	7.6 (1.7)	7.1 (1.6)	4.9 (1.1)	4.4 (1.0)	8.0 (1.8)	7.3 (1.7)	5.5 (1.2)	5.0 (1.1)	9.0 (2.0)	8.2 (1.9)
g	4.9 (1.1)	4.4 (1.0)	8.0 (1.8)	7.3 (1.7)	5.5 (1.2)	5.0 (1.1)	9.0 (2.0)	8.2 (1.9)	3.5 (0.8)	3.1 (0.7)	6.0 (1.4)	5.6 (1.3)
h	5.5 (1.2)	5.0 (1.1)	9.0 (2.0)	8.2 (1.9)	3.5 (0.8)	3.1 (0.7)	6.0 (1.4)	5.6 (1.3)	4.0 (0.9)	3.5 (0.8)	7.0 (1.6)	6.6 (1.5)
i	3.5 (0.8)	3.1 (0.7)	6.0 (1.4)	5.6 (1.3)	4.0 (0.9)	3.5 (0.8)	7.0 (1.6)	6.6 (1.5)	4.6 (1.0)	4.2 (0.9)	8.0 (1.8)	7.6 (1.7)
j	4.0 (0.9)	3.5 (0.8)	7.0 (1.6)	6.6 (1.5)	4.6 (1.0)	4.2 (0.9)	8.0 (1.8)	7.6 (1.7)	2.6 (0.6)	2.3 (0.5)	5.6 (1.3)	5.2 (1.2)
k	4.6 (1.0)	4.2 (0.9)	8.0 (1.8)	7.6 (1.7)	2.6 (0.6)	2.3 (0.5)	5.6 (1.3)	5.2 (1.2)	1.6 (0.4)	1.3 (0.3)	3.5 (0.8)	3.1 (0.7)
l	2.6 (0.6)	2.3 (0.5)	5.6 (1.3)	5.2 (1.2)	1.6 (0.4)	1.3 (0.3)	3.5 (0.8)	3.1 (0.7)	2.2 (0.5)	1.8 (0.4)	4.3 (1.0)	3.8 (0.9)
m	1.6 (0.4)	1.3 (0.3)	3.5 (0.8)	3.1 (0.7)	2.2 (0.5)	1.8 (0.4)	4.3 (1.0)	3.8 (0.9)	3.0 (0.7)	2.4 (0.5)	8.0 (1.8)	7.5 (1.7)
n	2.2 (0.5)	1.8 (0.4)	4.3 (1.0)	3.8 (0.9)	3.0 (0.7)	2.4 (0.5)	8.0 (1.8)	7.5 (1.7)	10.0 (0.28)	7.0 (0.20)	20.0 (0.57)	16.0 (0.45)
o	3.0 (0.7)	2.4 (0.5)	8.0 (1.8)	7.5 (1.7)	10.0 (0.28)	7.0 (0.20)	20.0 (0.57)	16.0 (0.45)	12.0 (0.34)	9.0 (0.25)	-	-

Air - Brass or Cast Iron Reducing Tee
Vane	1/2" NPT	3/4" NPT	1" NPT	1-1/4" NPT	1-1/2" NPT	2" NPT
Full Size	9.0 (2.0)	8.5 (1.9)	9.5 (2.2)	9.0 (2.0)	10.0 (2.3)	9.3 (2.1)	11.0 (2.5)	10.0 (2.3)	39.0 (1.10)	37.0 (1.05)	40.0 (1.13)	38.0 (1.08)
a	9.5 (2.2)	9.0 (2.0)	10.0 (2.3)	9.3 (2.1)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	40.0 (1.13)	38.0 (1.08)	42.0 (1.19)	40.0 (1.13)
b	10.0 (2.3)	9.3 (2.1)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	42.0 (1.19)	40.0 (1.13)	50.0 (1.42)	44.0 (1.25)
c	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	11.0 (2.5)	10.0 (2.3)	50.0 (1.42)	44.0 (1.25)	27.0 (0.76)	25.0 (0.71)
d	6.2 (1.4)	5.5 (1.2)	12.0 (2.7)	10.0 (2.3)	7.0 (1.6)	6.5 (1.5)	13.0 (3.0)	11.0 (2.5)	27.0 (0.76)	25.0 (0.71)	55.0 (1.56)	46.0 (1.30)
e	7.0 (1.6)	6.5 (1.5)	13.0 (3.0)	11.0 (2.5)	4.3 (1.0)	3.9 (0.9)	7.6 (1.7)	7.1 (1.6)	30.0 (0.85)	28.0 (0.79)	32.0 (0.85)	30.0 (0.79)
f	4.3 (1.0)	3.9 (0.9)	7.6 (1.7)	7.1 (1.6)	4.9 (1.1)	4.4 (1.0)	8.0 (1.8)	7.3 (1.7)	20.0 (0.57)	18.0 (0.51)	32.0 (0.85)	30.0 (0.79)
g	4.9 (1.1)	4.4 (1.0)	8.0 (1.8)	7.3 (1.7)	5.5 (1.2)	5.0 (1.1)	9.0 (2.0)	8.2 (1.9)	21.0 (0.59)	19.0 (0.54)	32.0 (0.91)	30.0 (0.85)
h	5.5 (1.2)	5.0 (1.1)	9.0 (2.0)	8.2 (1.9)	3.5 (0.8)	3.1 (0.7)	6.0 (1.4)	5.6 (1.3)	23.0 (0.65)	21.0 (0.59)	34.0 (0.96)	32.0 (0.91)
i	3.5 (0.8)	3.1 (0.7)	6.0 (1.4)	5.6 (1.3)	4.0 (0.9)	3.5 (0.8)	7.0 (1.6)	6.6 (1.5)	16.0 (0.45)	15.0 (0.42)	24.0 (0.68)	22.0 (0.62)
j	4.0 (0.9)	3.5 (0.8)	7.0 (1.6)	6.6 (1.5)	4.6 (1.0)	4.2 (0.9)	8.0 (1.8)	7.6 (1.7)	18.0 (0.51)	16.0 (0.45)	28.0 (0.79)	25.0 (0.71)
k	4.6 (1.0)	4.2 (0.9)	8.0 (1.8)	7.6 (1.7)	2.6 (0.6)	2.3 (0.5)	5.6 (1.3)	5.2 (1.2)	19.0 (0.54)	17.0 (0.48)	33.0 (0.93)	30.0 (0.85)
l	2.6 (0.6)	2.3 (0.5)	5.6 (1.3)	5.2 (1.2)	1.6 (0.4)	1.3 (0.3)	3.5 (0.8)	3.1 (0.7)	13.0 (0.37)	12.0 (0.34)	22.0 (0.62)	20.0 (0.57)
m	1.6 (0.4)	1.3 (0.3)	3.5 (0.8)	3.1 (0.7)	2.2 (0.5)	1.8 (0.4)	4.3 (1.0)	3.8 (0.9)	6.4 (0.18)	3.8 (0.11)	15.0 (0.42)	14.0 (0.40)
n	2.2 (0.5)	1.8 (0.4)	4.3 (1.0)	3.8 (0.9)	3.0 (0.7)	2.4 (0.5)	8.0 (1.8)	7.5 (1.7)	10.0 (0.28)	7.0 (0.20)	20.0 (0.57)	16.0 (0.45)
o	3.0 (0.7)	2.4 (0.5)	8.0 (1.8)	7.5 (1.7)	12.0 (0.34)	9.0 (0.25)	-	-	-	-	-	-

Cold Water - Stainless or Forged Steel Straight Tee and Bushing
Vane	1/2" NPT	3/4" NPT	1" NPT	1-1/4" NPT	1-1/2" NPT	2" NPT
Full Size	5.0 (1.1)	4.5 (1.0)	8.5 (1.9)	7.8 (1.8)	5.5 (1.2)	5.0 (1.1)	9.2 (2.1)	8.6 (2.0)	6.2 (1.4)	5.7 (1.3)	9.8 (2.2)	9.0 (2.0)
a	5.5 (1.2)	5.0 (1.1)	9.2 (2.1)	8.6 (2.0)	6.2 (1.4)	5.7 (1.3)	9.8 (2.2)	9.0 (2.0)	6.8 (1.5)	6.3 (1.4)	12.0 (2.7)	10.0 (2.3)
b	6.2 (1.4)	5.7 (1.3)	9.8 (2.2)	9.0 (2.0)	6.8 (1.5)	6.3 (1.4)	12.0 (2.7)	10.0 (2.3)	2.8 (0.6)	2.4 (0.5)	8.5 (1.9)	7.8 (1.8)
c	6.8 (1.5)	6.3 (1.4)	12.0 (2.7)	10.0 (2.3)	2.8 (0.6)	2.4 (0.5)	8.5 (1.9)	7.8 (1.8)	3.4 (0.8)	3.0 (0.7)	10.0 (2.3)	9.2 (2.1)
d	2.8 (0.6)	2.4 (0.5)	8.5 (1.9)	7.8 (1.8)	3.4 (0.8)	3.0 (0.7)	10.0 (2.3)	9.2 (2.1)	4.0 (0.9)	3.6 (0.8)	12.0 (2.7)	10.0 (2.3)
e	3.4 (0.8)	3.0 (0.7)	10.0 (2.3)	9.2 (2.1)	4.0 (0.9)	3.6 (0.8)	12.0 (2.7)	10.0 (2.3)	2.0 (0.5)	1.5 (0.3)	5.0 (1.1)	3.6 (1.0)
f	4.0 (0.9)	3.6 (0.8)	12.0 (2.7)	10.0 (2.3)	2.0 (0.5)	1.5 (0.3)	5.0 (1.1)	3.6 (1.0)	2.5 (0.6)	2.0 (0.5)	6.5 (1.48)	6.1 (1.39)
g	2.0 (0.5)	1.5 (0.3)	5.0 (1.1)	3.6 (1.0)	2.5 (0.6)	2.0 (0.5)	6.5 (1.48)	6.1 (1.39)	3.5 (0.8)	3.0 (0.7)	9.0 (2.0)	8.2 (1.9)
h	2.5 (0.6)	2.0 (0.5)	6.5 (1.48)	6.1 (1.39)	3.5 (0.8)	3.0 (0.7)	9.0 (2.0)	8.2 (1.9)	7.0 (1.6)	5.5 (1.2)	10.0 (2.3)	8.0 (1.8)
i	3.5 (0.8)	3.0 (0.7)	9.0 (2.0)	8.2 (1.9)	7.0 (1.6)	5.5 (1.2)	10.0 (2.3)	8.0 (1.8)	10.0 (2.3)	8.0 (1.8)	-	-
j	7.0 (1.6)	5.5 (1.2)	10.0 (2.3)	8.0 (1.8)	10.0 (2.3)	8.0 (1.8)	-	-	-	-	-	-
k	10.0 (2.3)	8.0 (1.8)	-	-	-	-	-	-	-	-	-	-

Air - Stainless or Forged Steel Straight Tee and Bushing
Vane	1/2" NPT	3/4" NPT	1" NPT	1-1/4" NPT	1-1/2" NPT	2" NPT
Full Size	21.0 (0.59)	18.0 (0.51)	33.0 (0.93)	30.0 (0.85)	22.0 (0.62)	20.0 (0.57)	39.0 (1.10)	36.0 (1.02)	24.0 (0.68)	22.0 (0.62)	42.0 (1.19)	38.0 (1.08)
a	22.0 (0.62)	20.0 (0.57)	39.0 (1.10)	36.0 (1.02)	24.0 (0.68)	22.0 (0.62)	42.0 (1.19)	38.0 (1.08)	28.0 (0.79)	26.0 (0.74)	51.0 (1.44)	46.0 (1.30)
b	24.0 (0.68)	22.0 (0.62)	42.0 (1.19)	38.0 (1.08)	28.0 (0.79)	26.0 (0.74)	51.0 (1.44)	46.0 (1.30)	12.0 (0.34)	10.0 (0.28)	33.0 (0.93)	30.0 (0.85)
c	28.0 (0.79)	26.0 (0.74)	51.0 (1.44)	46.0 (1.30)	12.0 (0.34)	10.0 (0.28)	33.0 (0.93)	30.0 (0.85)	14.0 (0.40)	12.0 (0.34)	37.0 (1.05)	34.0 (0.96)
d	12.0 (0.34)	10.0 (0.28)	33.0 (0.93)	30.0 (0.85)	14.0 (0.40)	12.0 (0.34)	37.0 (1.05)	34.0 (0.96)	16.0 (0.45)	14.0 (0.40)	43.0 (1.22)	40.0 (1.13)
e	14.0 (0.40)	12.0 (0.34)	37.0 (1.05)	34.0 (0.96)	16.0 (0.45)	14.0 (0.40)	43.0 (1.22)	40.0 (1.13)	8.0 (0.23)	6.5 (0.18)	19.0 (0.54)	17.0 (0.48)
f	16.0 (0.45)	14.0 (0.40)	43.0 (1.22)	40.0 (1.13)	8.0 (0.23)	6.5 (0.18)	19.0 (0.54)	17.0 (0.48)	11.0 (0.31)	10.0 (0.28)	26.0 (0.74)	24.0 (0.68)
g	8.0 (0.23)	6.5 (0.18)	19.0 (0.54)	17.0 (0.48)	11.0 (0.31)	10.0 (0.28)	26.0 (0.74)	24.0 (0.68)	14.0 (0.40)	13.0 (0.37)	32.0 (0.91)	30.0 (0.85)
h	11.0 (0.31)	10.0 (0.28)	26.0 (0.74)	24.0 (0.68)	14.0 (0.40)	13.0 (0.37)	32.0 (0.91)	30.0 (0.85)	27.0 (0.76)	24.0 (0.68)	-	-
i	14.0 (0.40)	13.0 (0.37)	32.0 (0.91)	30.0 (0.85)	27.0 (0.76)	24.0 (0.68)	-	-	-	-	-	-
j	27.0 (0.76)	24.0 (0.68)	-	-	-	-	-	-	-	-	-	-
k	39.0 (1.10)	36.0 (1.02)	-	-	-	-	-	-	-	-	-	-

Dimensions

Detailed dimensional drawings are provided for various configurations, including low-flow models, models with ATEX/IECEx enclosures, and models with trimmable vanes or tees.

Diagrams show overall dimensions and connection ports (NPT).

A table provides specific dimensions (Dim. A, Dim. B) for different pipe sizes and materials (Brass/Ductile Iron, Forged/Stainless Steel, Malleable Iron).

Illustrations detail the trimmable vane and the terminal connection layouts for SPDT and DPDT switches.

Maintenance

Regular inspection and cleaning of wetted parts are recommended. Ensure the cover remains in place to protect internal components. Disconnect power before opening the unit for maintenance or repair. Repairs should be performed by Dwyer Instruments, Inc.

Safety and Compliance

CAUTION: To prevent ignition of hazardous atmospheres, disconnect the device from the power supply before opening.

The product complies with relevant safety standards for hazardous locations, including ATEX and IECEx directives, ensuring safe operation when installed correctly.

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