Hazardous Location
Industrial VRS Magnetic
Speed Sensors
DESCRIPTION
Hazardous Location VRS sensors are designed for use in
locations where explosion-proof or intrinsically safe sensors
are required.
Passive VRS (Variable Reluctance Speed) Magnetic Speed
sensors are simple, rugged devices that do not require an
external voltage source for operation.
A permanent magnet in the sensor establishes a fixed
magnetic field. The approach and passing of a ferrous metal
target near the sensor’s pole piece (sensing area) changes the
flux of the magnetic field, dynamically changing its strength.
This change in magnetic field strength induces a current into a
coil winding which is attached to the output terminals.
FEATURES
Self-powered operation
Direct conversion of actuator speed to output frequency
Simple installation
No moving parts
Designed for use over a wide range of speeds
Adaptable to a wide variety of configurations
Customized VRS products for unique speed sensing
applications
Housing diameters: 3/4 in, 5/8 in
Housing material/style: stainless steel threaded
Terminations: MS3106 connector, preleaded
Output voltages: 30 Vp-p to 60 Vp-p
The output signal of a VRS sensor is an ac voltage that varies
in amplitude and wave frequency as the speed of the
monitored device changes, and is usually expressed in peak to
peak voltage (Vp-p).
One complete waveform (cycle) occurs as each target passes
the sensor’s pole piece. If a standard gear were used as a
target, this output signal would resemble a sine wave if viewed
on an oscilloscope.
Honeywell also offers VRS sensors for general purpose, high
output, power output, high resolution and high temperature, as
well as low-cost molded versions.
POTENTIAL APPLICATIONS
Engine RPM (revolutions per minute) measurement on
aircraft, automobiles, boats, buses, trucks and rail
vehicles
Motor RPM on oil and gas drilling equipment and
machinery
Motor RPM measurement on drills, grinders, lathes and
automatic screw machines
Process speed measurement on food, textile, paper,
woodworking, printing, tobacco and pharmaceutical
industry machinery
Motor speed measurement of electrical generating
equipment in grain elevators, sawmills and other
potentially explosive environments
Speed measurement of pumps, blowers, mixers, exhaust
Gear speed measurement
Hazardous Location
3/4 INCH EXPLOSION-PROOF SENSORS (All dimensions for reference only. mm/[in])
When properly installed using the explosion containment method, all 3070X and catalog listings on this page are certified for use in
hazardous locations as follows: Class I, Groups A, B, C, D; Class II Groups E, F, G; Class III.
These catalog listings have been tested to and meet the requirements of applicable U.S. and Canadian specifications for the
locations described above.
General Specifications
Parameter
Characteristic
Min. output voltage 60 Vp-p
Coil resistance
Pole piece
diameter
Min. surface
speed
Operating temp.
range
Mounting thread
191 Ohm to 280 Ohm
4,75 mm [0.187 in]
0,38 m/s [15 in/s] typ.
-73
ºC
to 93
ºC
[-100
ºF
to 200
ºF]
3/4-20 UNEF-2A
Parameter
Inductance
Gear pitch range
Optimum actuator
Max. operating
frequency
Vibration
Termination
Characteristic
115 mH max.
12 DP (module 2.11)
or coarser
8 DP (module 3.17)
ferrous metal gear
40 kHz typ.
Mil-Std 202F
Method 204D
18 AWG PVC-Insulated
Leads
31,75
[1.250]
3000 MIN
[120.00]
1/2-14 NPT
Test Condition Specifications
Parameter
Characteristic
Surface speed 25 m/s
[1000 in/s]
Gear
8 DP
(module 3.17)
Air gap
0,127 mm
[0.005 in]
Load
100 kOhm
resistance
Catalog
Listing
3070A
3070A35
Thread
Weight
Length (A)
45 mm [1.8 in] 294 g [10.5 oz]
88 mm [3.5 in] 322 g [11.5 oz]
24,05
[1.00]
A
BLIND END SHELL
POLE PIECE
2
www.honeywell.com/sensing
Industrial VRS Magnetic Speed Sensors
5/8 INCH EXPLOSION-PROOF SENSORS (All dimensions for reference only. mm/[in])
When properly installed using the explosion containment method, the 3090X catalog listings on this page are certified for use in
hazardous locations as follows: Class I, Groups A, B, C, D; Class II Groups E, F, G; Class III.
These catalog listings have been tested to and meet the requirements of applicable U.S. and Canadian specifications for the
locations described above.
The catalog listings on this page conform to standards:
General Specifications
Parameter
Characteristic
Min. output voltage 60 Vp-p
Coil resistance
Pole piece
diameter
Minimum surface
speed
Operating temp.
range
Mounting thread
191 Ohm to 280 Ohm
4,75 mm [0.187 in]
0,38 m/s [15 in/s] typ.
Parameter
Inductance
Gear pitch range
Optimum actuator
Maximum
operating
frequency
Vibration
Termination
Characteristic
115 mH max.
12 DP (module 2.11)
or coarser
8 DP (module 3.17)
ferrous metal gear
40 kHz typ.
II 3 G EEx nA II T6.
Test Condition Specifications
Parameter
Characteristic
Surface speed 25 m/s
[1000 in/s]
Gear
8 DP
(module 3.17)
Air gap
0,127 mm
[0.005 in]
Load
100 kOhm
resistance
-73
ºC
to 93
ºC
[-100
ºF
to 200
ºF]
5/8-20 UNF-2A
Mil-Std 202F
Method 204D
18 AWG PVC-insulated
leads
31,75
[1.250]
3000 MIN
[120.00]
1/2-14 NPT
Catalog
Listing
3090A
3090A35
Thread
Length (A)
45 mm [1.8 in]
88 mm [3.5 in]
Weight
280 g [9.0 oz]
366 g [10.0 oz]
24,5
[1.00]
A
BLIND END SHELL
POLE PIECE
Honeywell Sensing and Control
3
Hazardous Location
5/8 INCH (M16*) INTRINSICALLY SAFE VRS SENSORS (All dimensions for reference only. mm/[in])
*Contact Honeywell for availability of metric mounting thread versions.
When properly installed using the intrinsic safety protection method connected per the control drawings on pages 6 and 7, catalog
listings 3042A is intrinsically safe for hazardous locations as follows:
Class I, Groups A, B, C, D.
This product has been tested to and meets the requirements of applicable U.S. and Canadian specifications for the locations
described above.
General Specifications
Parameter
Characteristic
Min. output voltage 30 Vp-p
Coil resistance
Pole piece
diameter
Min. surface
speed
Operating temp.
range
Mounting thread
Catalog
Listing
3042A
150 Ohm
3,9 mm [0.156 in]
0,38 m/s [15 in/s] typ.
-55
ºC
to 120
ºC
[-67
ºF
to 250
ºF]
5/8-18 UNF-2A
Parameter
Inductance
Gear pitch range
Optimum actuator
Max. operating
frequency
Vibration
Termination
Characteristic
26 mH max.
16 DP (module 1.58)
or coarser
12 DP (module 3.17)
ferrous metal gear
40 kHz typ.
N/A
MS3106 connector
Test Condition Specifications
Parameter
Characteristic
Surface speed 25 m/s
[1000 in/s]
Gear
8 DP
(module 3.17)
Air gap
0,127 mm
[0.005 in]
Load
100 kOhm
resistance
Weight
70 g [2.5 oz]
19,05
[0.750]
8,0
[0.312]
0,76
[0.030]
36.5
[1.437]
28,12
[1.107]
Ø13,84
[0.545]
Ø18,29
[0.720]
B
+
A
-
‘
4
www.honeywell.com/sensing
Industrial VRS Magnetic Speed Sensors
5/8 INCH (M16*) INTRINSICALLY SAFE VRS SENSORS (All dimensions for reference only. mm/[in])
*Contact Honeywell for availability of metric mounting thread versions.
When properly installed using the intrinsic safety protection method connected per the control drawings on pages 6 and 7, catalog
listing 3042H20 is intrinsically safe for hazardous locations as follows:
Class I, Groups A, B, C, D; Class II Groups E, F, G; Class III.
This product has been tested to and meets the requirements of applicable U.S. and Canadian specifications for the locations
described above.
General Specifications
Parameter
Characteristic
Min. output voltage 30 Vp-p
Coil resistance
Pole piece
diameter
Min. surface
speed
Operating temp.
range
Mounting thread
150 Ohm
3,9 mm [0.156 in]
0,38 m/s [15 in/s] typ.
-55
ºC
to 120
ºC
[-67
ºF
to 250
ºF]
5/8-18 UNF-2A
Parameter
Inductance
Gear pitch range
Optimum actuator
Max. operating
frequency
Vibration
Termination
Characteristic
26 mH max.
16 DP (module 1.58)
or coarser
12 DP (module 3.17)
ferrous metal gear
40 kHz typ.
N/A
18 AWG PVC-insulated
leads
50
[2.0]
0,51
[0.020]
31,75
[1.250]
3000 MIN
[120.00]
1/2-14 NPT
Test Condition Specifications
Parameter
Characteristic
Surface speed 25 m/s
[1000 in/s]
Gear
8 DP
(module 3.17)
Air gap
0,127 mm
[0.005 in]
Load
100 kOhm
resistance
Catalog
Listing
3042AH20
Weight
140 g [5.0 oz]
25,4
[1.00]
Honeywell Sensing and Control
5
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