US Digital

PE Linear Probe Encoder

Overview

  • Standard 3/8" diameter mounting stem
  • Compact design
  • Linear ranges from 1" to 2"
  • 120 CPI to 500 CPI
  • 0.0005" to 0.0021" resolution
  • Finger-latching connector
  • A and B quadrature digital output
  • Optional 3rd channel (index)
  • TTL compatible outputs
  • Interfaces with all US Digital support products

The PE series linear plunger-style optical encoder has a machined aluminum enclosure. The PE provides either single-ended or differential quadrature encoder output...

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Product Specifications

ParameterDimensionUnits
Plunger Force (1" version) 3 to 6 typical oz.
Plunger Force (2" version) 3 to 9 typical oz.
Travel (1" version) 1.050 min. in.
Travel (2" version) 2.050 min. in.
Side Load 1 lb.

The maximum tracking speed of the encoder can be calculated as follows:

Maximum tracking speed ( in. / sec.) = 100000/CPI. Where CPI is the counts-per-inch of the encoder.

The tracking speed for several common CPI's are shown in the table below.

ParameterMax.Units
Tracking Speed, 125 CPI 800 in./sec.
Tracking Speed, 127 CPI 787 in./sec.
Tracking Speed, 250 CPI 400 in./sec.
Tracking Speed, 500 CPI 200 in./sec.
Vibration (5 Hz to 2000 Hz) 20 G.

The PE performs best over a 0 C to 50 C temperature zone due to a fairly linear temperature coefficient. They will however, operate at temperatures above 50C, but the thermal temperature coefficient becomes non linear at elevated temperatures. The negative temperature coefficient indicates the actual measured distance will decrease slightly with temperature increase.

ParameterSpecification
Operating Temperature 0 C to 50 C
1" Product Temperature Coefficient -0.000036" / C
2" Product Temperature Coefficient -0.000075" / C

The position resolution in inches using x4 quadrature counting (count every transition of the A and B outputs) can be calculated as follows:

Resolution = 1/(4*CPI) where CPI is the counts-per-inch of the encoder. Several common values are shown in the table below.

CPIResolutionAccuracy
125 0.002 in. 0.002 in.
127 50.0 μm 50.0 μm
250 0.0010 in. 0.0010 in.
500 0.0005 in. 0.0005 in.

 

A leads B for inward plunger motion, and B leads A for outward plunger motion (see the EM1 / HEDS page).

  • Specifications apply over entire operating temperature range.
  • Typical values are specified at Vcc = 5.0 V and 25 C.
  • For complete details see the EM1 and HEDS product pages.
 Supply CurrentOutput voltage lowOutput voltage high 
ResolutionTyp / MaxMaxMinBased on
All CPI's with index 27 / 30 mA 0.5 V @ 8 mA 2.0 V @ -8 mA EM1
SpecificationMin.Typ.Max.UnitsNotes
Supply 4.5 5.0 5.5 V
Current Consumption - 56 59 mA No load
Output Voltage
  Sourcing to +5 V
  Sinking to Ground
2.4
-
3.4
0.2
-
0.4
V
V
@ -20 mA
@ 20 mA

For complete details see the EM1 / HEDS page.

For tapped blind hole mounting:

Part #: SCREW-440-250-PH

Description: #4-40 x 1/4"

Quantity Required for Mounting: 4 per encoder

 

Part #: SCREW-440-375-PH

Description: #4-40 x 3/8"

Quantity Required for Mounting: 4 per encoder

 

Part #: SCREW-440-500-PH

Description: #4-40 x 1/2"

Quantity Required for Mounting: 4 per encoder

 

Part #: SCREW-440-625-PH

Description: #4-40 x 5/8"

Quantity Required for Mounting: 4 per encoder

For body through hole mounting:

 

Part #: SCREW-440-1000-PH

Description: #4-40 x 1"

Quantity Required for Mounting: 2 per encoder

5-pin Single-ended:

PinDescription
1 Ground
2 Index
3 A channel
4 +5VDC power
5 B channel

10-pin Differential:

PinDescription
1 Ground
2 Ground
3 Index-
4 Index+
5 A- channel
6 A+ channel
7 +5VDC power
8 +5VDC power
9 B- channel
10 B+ channel

Product Description

The PE series linear plunger-style optical encoder has a machined aluminum enclosure. The PE provides either single-ended or differential quadrature encoder output in a convenient mechanical package. Various CPI (counts per inch) ranging from 120 CPI to 500 CPI are available. Using x4 quadrature counting, the available resolutions range from 0.0005" to 0.0021". Note that 127 CPI gives a resolution of 50 micrometers.

The PE features smooth linear bearings for repeatable measurements and an internal spring to return the plunger to its fully extended position. Standard linear measurement ranges are from 1 to 2 inches. The precision plunger has #4-48 threads on both ends to accept industry standard contact points. The PE may be mounted four different ways: the #4-40 clearance body through holes, the #4-40 tapped blind holes, the standard 3/8" diameter mounting stem, or the lug back option.

The single-ended output interface is normally designed for applications of 6 feet or less. For longer cable lengths, the differential output interface is recommended.

The internal encoder module incorporates a lensed LED light source and a monolithic photodetector array. The monolithic photodetector has signal shaping electronics which produces a two channel quadrature with optional index bounceless TTL output. When Index is specified, the default location is in the middle of the linear probe's range of travel with a location tolerance of ±0.050".

For differential versions: the internal differential line driver (26C31) can source and sink 20mA at TTL levels. The recommended receiver is industry standard 26C32. Maximum noise immunity is achieved when the differential receiver is terminated with a 110 Ω resistor in series with a .0047 μF capacitor placed across each differential pair. The capacitor simply conserves power; otherwise power consumption would increase by approximately 20 mA per pair, or 40 mA for 2 pairs.

A secure connection to the PE encoder is made through a 5-pin (single-ended versions) or 10-pin (differential versions) polarized connector (sold separately). The mating connectors are available from US Digital with several cable options and lengths.

Product Notes
  • Cables and connectors are not included and must be ordered separately.
  • For ordering information please see the Compatible Cables / Connectors section above.
  • US Digital warrants its products against defects in materials and workmanship for two years. See complete warranty for details.
Related Documentation

Purchasing

Configure and Purchase

1. CPI
2. Stroke


3. Index


4. Output


5. Housing


Product Part Number
Quantity Price
1 $178.00
10 $159.71
50 $143.73
100 $129.36
Over 100 Call for quote
Quantity
Unit Price

$178.00

Subtotal

$178.00

For your convenience, use the above part number to order via phone 800.736.0194

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