SR1M

SR1M
Industrial • User Scalable 4–20mA Output
User Adjustable Stroke Range to 175 inches (3 meters)
Easy Push-Button Zero and Span Adjust
Designed for Outdoor & IP67 environments
In Stock for Quick Delivery!
175-inch model shown
4.75” [120 mm]
6” [152 mm]
4” [100 mm]
SPECIFICATIONS
Full Stroke Range, SR1M-125
125 inches (3175 mm), maximum
Full Stroke Range, SR1M-175
175 inches (4445 mm), maximum
Minimum Full Stroke Range
1 inches (25 mm)
Output Signal Settings
ORDERING INFORMATION
10-30 VDC
Accuracy, full stroke range ≥ 10 inches (254 mm)
.5% FS.
Accuracy, full stroke range < 10 inches (254 mm)
consult factory
Repeatability
13 ft (4 m)
22 AWG (.34mm²)
.1% FS.
Resolution
.0015% FS.
Output Signal Update Rate
1 msec
80 inches (2 meters) per second
Maximum Acceleration
10 g (retraction)
Measuring Cable Tension
Sensor
What sets this sensor apart from other string pots, is the
internal programmable digital circuitry that gives the customer a one-size-fits-all approach for many applications.
The SR1M ships factory calibrated to the full stroke range
but the output signal can be easily re-scaled to match any
stroke down to 1 inch (25 mm).
4...20mA, 20...4mA
Input Voltage
Maximum Velocity
The SR1M is part of a series of rugged, low-cost, high performance string pots built for wet environments and outdoor
applications. Designed for the rigors of outdoor construction equipment or the demands of a factory floor, the SR1M
is the perfect low-cost solution for OEM and stocking distributors.
Order No.
Order No.
Order No.
SR1M-125
SR1M-175
9036810-0040
125-inch stroke range,
4–20mA output,
4-pin M12 mating plug &
mounting bracket included.
175-inch stroke range,
4–20mA output,
4-pin M12 mating plug &
mounting bracket included.
for short-run connections,
optional 13-ft cordset
with 4-pin M12 mating
plug.
23 oz. (6,4 N) ±30%
plastic-hybrid precision potentiometer
Cycle Life
250,000 (potentiometer)
Output Signal:
Enclosurepolycarbonate
Measuring Cable
Electrical Connection
.034-inch dia. nylon-coated stainless
M12 Connector (mating plug included)
Environmental Suitability
Operating Temperature
4...20mA
NEMA 6, IP67
-40˚ to 185˚ F (-40˚ to 85˚ C)
Weight
(0% fs.)
(100% fs.)
2.5 lbs. (1.3 Kg)
20630 Plummer Street • Chatsworth, CA 91311
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
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SR1M | 1
Electrical Connection
1
connector
pin
colorcode
(cordset)
10...30 vdc
n/c
output signal
n/c
1
2
3
4
brown
white
blue
black
22 AWG (.34mm2)
2
4
i/o
signal
1.7” [45 mm]
3
13.6 ft. [4 M]
contact view
1
.25 in [6 mm]
max. cable dia.
2
4
3
contact view
2.4” [60mm]
Factory Calibrated Stroke Range
The full scale output signal is set at the factory to the maximum full stroke range of the sensor. The ZERO point
(output = 4mA) is set at the beginning* of the stroke range (0
inches) and the SPAN point (output = 20mA) is set to the end
of the range (125 inches or 175 inches depending on model).
20 mA
.125-in (3,2 mm)
*Important — The ZERO point is set at the factory with the
measuring cable pulled out .125 inches from full retraction.
If the measuring cable becomes fully retracted at any time
when the sensor is under power, the output signal will begin
to fluctuate. This is normal and fluctuation will stop as soon
as the cable is extended greater than .125 inches.
4 mA
Full Stroke Range
Factory Set
ZERO
This is for the factory setting only and the ZERO may be reprogrammed at full retraction at any time.
Changing the Cable Exit
Factory Set
SPAN
Measuring Cable
Changing Measuring Cable Exit
To change the direction of the measuring cable,
remove the 4 mounting bracket screws and
rotate bracket to one of four available positions.
See figures 1 - 4 on the following pages for
mounting dimensions.
Rear Cover
Changing Electrical Connector Direction
To change the position of the electrical connector,
remove the 4 rear cover screws and carefully separate rear cover from the sensor body.
Rotate the rear cover to desired position being careful to not tangle the wiring harness that runs to the
connector.
Mounting Bracket
Electrical Connector
Cable Exit Direction Options
see fig. 1
see fig. 3
see fig. 2
see fig. 4
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2 | SR1M
Internal Controller Board
Zero / Span Pushbutton
Status LED**
Signal Reversing Switch
to gain access to the
controller board, remove
the four phillips screws
and remove rear cover.
ON
green
off
red
off
on
flashing
flashing
on
output signal within programmed limits
output signal below zero setting
output signal beyond span setting
**Note: Flashing Status LED will cause the output signal to fluctuate.
Status LED
zero/span pushbutton and signal selection switches
located on controller board
Changing Output Signal
Reprogramming ZERO and SPAN:
The ZERO and SPAN points have been preset at the factory but can
easily be changed to match any desired stroke within the full stroke
limits of the sensor. To reprogram the SR1M to your own settings,
remove the rear cover to gain access to the internal controller board.
Locate the push-button on the circuit board and follow the instructions below.
Factory Set Span
Factory Set Zero
Factory Calibrated Stroke Range
SR1M-125 = 125 inches
SR1M-175 = 175 inches
Please note that ZERO and SPAN points can be set independently. You can set one without setting the other. This operation must be
performed with the sensor under power. Important: when you are finished, disconnect power for at least 2 seconds to permanently set your new
settings.
Setting Span:
Set the cable to the desired SPAN point then depress and hold the
button until the STATUS LED begins to flash RED. Release the button
when the LED begins to flash RED (not GREEN). The flashing will then
slow down to about two-second intervals to indicate that the SPAN
value is being set into memory. When completed, the STATUS LED will
turn off.
Set Span
Setting Zero:
Set the cable to the desired ZERO point and then depress and hold
the button until the STATUS LED begins to flash GREEN. Release the
button when the LED begins to flash GREEN (not RED). The flashing
will then slow down to about two-second intervals to indicate that the
ZERO value is being set into memory. When completed, the STATUS
LED will turn off. Remove power for 2 seconds then reconnect.
Set Zero
Reversing the Output Signal:
The SR1M leaves the factory set with a 4...20 mA full scale output signal.
The signal can be reversed (see illustration) by simply changing a dipswitch
located on the controller board.
on
off
zero
output signal
options (mA)
span
4 ... 20
20 ... 4
switch settings
off
on
This may be done without resetting the “zero” and “span” points.
Remove the rear cover to gain access to the board.
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
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SR1M | 3
Fig. 1 - Outline Drawing (as shipped)
A
Model
A
B
125-inch
2.00 ±.13
[50,8 ±3,3]
2.37 ±.13
[60,22 ±3,3]
175-inch
2.87 ±.13
[72,8 ±3,2]
3.24 ±.13
[82.2 ±3,2]
5.50 [139,7]
.75 [19,0]
Ø.265 [6,73]
4 places
Cable Guide Detail
175-inch
62-inch & 125-inch
.84 [21,3]
2.37[60,1]
1.50[38]
.65 [16,5]
.52[13,2]
.90
[22,8]
B
3.85 [97,8] max.
4.76 [120,9]
Eyelet Detail
1.39
[35,3]
0.70 [17,8]
2.50
[63,5]
Ø.191 [4,85]*
Ø.375 [9,52]**
Ø 4.49 [114,0]
.165 [4,19]
2.91 [73,9]
Ø.53[13,4]
6.00 [152,4]
1.18 [30,0]
* tolerance = +.005 –.001 [+.13 –.03]
** tolerance = +.005 –.005 [+.13 –.13]
units are in inches [mm] tolerances are ± .04 [1,0] unless otherwise noted
Fig. 2 - “Up” Cable Exit Direction
5.50 [139,7]
.96 [24,4]
.75 [19,0]
Ø.265 [6,73]
4 places
.84 [21,3]
.60 [15,2]
Model
A
125-inch
3.64 ±.13
[92,5 ±3,3]
175-inch
4.54 ±.13
[115,3 ±3,3]
1.59 [40,4]
Ø 4.49 [114,0]
A
3.61 [91,7]
1.391 [35,32]
4.76 [120,9]
6.00 [152,4]
.65 [16,5]
1.18 [30,0]
3.85 [97,8] max.
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
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4 | SR1M
Fig. 3 - “Down” Cable Exit Direction
5.50 [139,7]
.75 [19,0]
.95 [24,1]
.84 [21,3]
Ø.265 [6,73]
4 places
Model
A
125-inch
2.25 ±.13
[57,2 ±3,3]
175-inch
3.17 ±.13
[80,5 ±3,3]
bottom cable exit location
3.85 [97,8] max.
4.76 [120,9]
Ø 4.49 [114,0]
.65 [16,5]
3.61 [91,7]
1.39 [35,3]
1.18 [30,0]
A
1.59 [40,4]
.58 [14,7]
Fig. 4 - “Rear” Cable Exit Direction
5.50 [139,7]
A
A
B
125-inch
2.00 ±.13
[50,8 ±3,3]
2.37 ±.13
[60,22 ±3,3]
175-inch
2.87 ±.13
[72,8 ±3,2]
3.24 ±.13
[82.2 ±3,2]
Model
.75 [19,0]
Ø.265 [6,73]
4 places
.84 [21,3]
.65 [16,5]
4.76 [120,9]
B
3.85 [97,8] max.
Ø 4.49 [114.0]
4.30 [109,2]
3.61 [91,7]
2.50 [63,5]
1.39 [35,3]
6.00 [152,4]
1.18 [30,0]
version: 4.0 last updated: March 5, 2013
1.59 [40,4]
units are in inches [mm] tolerances are ± .04 [1,0] unless otherwise noted
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
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SR1M | 5