PT8420
Heavy Industrial • 4..20mA / 0..20mA
Absolute Linear Position to 60 inches (1524 mm)
Aluminum or Stainless Steel Enclosure Options
VLS Option To Prevent Free-Release Damage
IP68 / NEMA 6 • Hazardous Area Certification
GENERAL
Full Stroke Range Options
0-2 to 0-60 inches
Output Signal Options
4...20 mA (2-wire) and 0...20 mA (3-wire)
Accuracy
see ordering information
Repeatability
± 0.05% full stroke
Resolution
essentially infinite
Measuring Cable Options
Enclosure Material
stainless steel or thermoplastic
powder-painted aluminum or stainless steel
Sensor
plastic-hybrid precision potentiometer
Potentiometer Cycle Life see ordering information
Maximum Retraction Acceleration
see ordering information
ELECTRICAL
Input Voltage
see ordering information
Input Current
20 mA max.
Maximum Loop Resistance (Load)
(loop supply voltage - 8)/0.020
Circuit Protection
38 mA max.
Impedance
100M ohms@100 VDC, min.
Signal Adjust, Zero
from factory set zero to 50% of full stroke range
Signal Adjust, Span
to 50% of factory set span
Thermal Effects, Zero
0.01% f.s./°F, max.
Thermal Effects, Span
0.01% f.s./°F, max.
3.6” [91 mm]
5.6” [141 mm]
The PT8420 with its 4-20 mA feedback signal, is ideal for
monitoring the stroke of a hydraulic cylinder and other applications requiring position data acquistion in harsh environments.
As a member of our family of NEMA 4-rated cable-extension
transducers, the PT8420 provides a feedback signal that is
proportional to the linear movement of a traveling stainless-steel extension cable. Simply mount the body of the
transducer to a fixed surface and attach the extension cable
to the moving object.
Output Signal:
EMC COMPLIANCE PER DIRECTIVE 89/336/EEC
Emission/Immunity
EN50081-2 / EN50082-2
ENVIRONMENTAL
Enclosure
NEMA 4/4X/6, IP 67/68
Hazardous Area Certification
(0% fs.)
(100% fs.)
see ordering information
Operating Temperature
Vibration
4...20 mA*
-40° to 200°F (-40° to 90°C)
up to 10 g’s to 2000 Hz maximum
Weight, Aluminum (Stainless Steel) Enclosure
3 lbs. (6 lbs.) max.
*Optional 3-wire, 0...20mA output signal available.
20630 Plummer Street • Chatsworth, CA 91311
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
meas-spec.com
PT8420 | 1
Outline Drawing:
see eyelet detail
A
0.99 [25,1]
eyelet detail
Ø.191 [4,19]*
Ø.375 [9,52]**
1.80 [45,7]
.165 [4,19]**
0.08 [2,0]
3.50 [88,9]
2.49 [63,3]
1.50 [37,6]
1.30 [33,3]
3.60 [91,4]
0.60 [15,2]
5.56 [141,2] max.
A
RANGE
2”, 10”
5”, 25”, 50”
15”
20”, 40”
30”, 60”
1.16 [29,5]
0.66 [16,8]
0.99 [25,7]
0.85 [21,6]
0.52 [13,3]
3.00 [76,2]
Ø.27 [6,8] thru
(4 places)
DIMENSIONS ARE IN INCHES [MM]
tolerances are ±0.02 in. [±0,5 mm] unless otherwise noted
note: *tolerance = +.005 –.001 [+.13 –.03]
1.64 [41,6]
**tolerance = +.005 –.005 [+.13 –.13]
Ordering Information:
Model Number:
Sample Model Number:
PT8420 - 0030 - 111 - 1110
PT8420-
R
order code:
Full Stroke Range:
R order code:
full stroke range, min:
accuracy (% of f.s.):
potentiometer cycle life*:
-
A
B
1 - 1
C
D
E
F
R
A
B
E
F
G
G
range:
enclosure/cable tension:
measuring cable:
output signal:
electrical connection:
cable guide option:
30 inches
aluminum/standard (13 oz.)
.034 nylon-coated stainless
4...20mA, 2-wire
6-pin plastic connector
standard nylon cable guide
0002
0005
0010
0015
0020
0025
0030
0040
0050
0060
2 in.
0.28%
5 in.
0.28%
20 in.
0.18%
5 x 105
25 in.
0.18%
5 x 105
30 in.
0.18%
5 x 105
50 in.
0.15%
60 in.
0.15%
2.5 x 106
15 in.
0.18%
5 x 105
40 in.
0.15%
2.5 x 106
10 in.
0.18%
5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
*–1 cycle is defined as the travel of the measuring cable from full retraction to full extension and back to full retraction
Enclosure Material and Measuring Cable Tension:
A order code:
enclosure:
cable tension:
max. acceleration:
cable tension option
specifications
1
5
2
3
aluminum
6
4
8
303 stainless
7
9
316 stainless
standard
medium
high
standard
medium
high
standard
medium
high
15 g
25 g
40 g
6g
12 g
18 g
6g
12 g
18 g
Range:
Standard:
Medium:
High:
2 in.
39 oz.
65 oz.
116 oz.
5 in.
16 oz.
26 oz.
47 oz.
10 in.
39 oz.
65 oz.
116 oz.
15 in.
26 oz.
43 oz.
77 oz.
20 in.
20 oz.
33 oz.
60 oz.
25 in.
16 oz.
26 oz.
47 oz.
30 in.
13 oz.
22 oz.
40 oz.
40 in.
20 oz.
33 oz.
60 oz.
50 in.
16 oz.
26 oz.
47 oz.
60 in.
13 oz.
22 oz.
40 oz.
tension tolerance: ± 50%
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
meas-spec.com
2 | PT8420
Ordering Information (cont.):
Measuring Cable:
B order code:
1
2
3
4
cable construction:
Ø.034-inch nylon-coated
stainless steel rope
Ø.047-inch bare
stainless steel rope
Ø.058-inch PVC jacketed
vectra fiber rope
Ø.031-inch bare
stainless steel rope
all ranges
5, 15, 20, 25, 30-inch only
thru 30 inches only
40, 50, 60-inch only
indoor
outdoor, debris,
high temperature
high voltage or
magnetic field
outdoor, debris,
high temperature
available ranges:
general use:
Output Signals:
E order code:
output signal options:
1
2
3
4
5*
6*
4...20 mA
20...4 mA
0...20 mA
20...0 mA
4...20 mA
20...4 mA
20
4
sensitivity:
wiring configuration:
input voltage:
hazardous area certification:
20
4
20
0
16 mA/full stroke ±0.25%
2 – wire
8 – 34 vdc
20
0
20 mA/full stroke ±0.25%
3 – wire
14 – 29 vdc
ordercode = 1 = 4...20 mA
{
20
4
16 mA/full stroke ±0.25%
2 – wire
14 – 32 vdc
CSA • Cenelec
not certified
Example:
20
4
Hazardous Area Certifications:
R
= 4 mA
CSA Standard 22.2
Class 1
Groups A, B, C and D
= 20 mA
Cenelec
LCIE EEx
ia IIc T4
*IMPORTANT: intrinsically safe when powered from a CSA certified zener barrier rated 28 VDC max, 110 mA max per installation drawing#677984
Electrical Connection:
1
2
3
4
6-pin plastic connector
w/mating plug
10-ft. [3 M]
waterproof cable
6-pin metal connector
w/mating plug
25-ft. [7.5 M]
instrumentation cable
F order code:
IP 67, NEMA 4X**, 6
IP 67, NEMA 4X**,6
IP 65, NEMA 4
1/2 - 5/16" [14 - 8 mm] cable dia.
16 AWG max conductor size
connector: MS3102E-14S-6P
mating plug: MS3106E-14S-6S
10 ft. x 0.4-in. dia.
[3 M x 10 mm dia.]
3-conductor, 18 AWG
type SJTOW
3/8-in. [9 mm] max cable dia.
16 AWG max conductor size
connector: MS3102E-14S-6P
mating plug: MS3106E-14S-6S
5
6
7
100-ft. [30 M]
waterproof cable
10-ft. [3 M]
pressure tested*
waterproof cable
100-ft. [30 M]
pressure tested*
waterproof cable
IP 67, NEMA 4X**,6
IP 68, NEMA 4X**, 6P
IP 68, NEMA 4X**, 6P
F order code:
100 ft. x 0.4-in. dia.
[30 M x 10 mm dia.]
18 AWG, type SJTOW
10 ft. x 0.4-in. dia.
[3 M x 10 mm dia.]
3-conductor, 18 AWG
type SJTOW
6-pin Mating Plug
pin
A
B
C
D
2-wire
8...34 vdc***
4...20 mA out
–
case ground
IP 67, NEMA 6
2.4 in.
[60 mm]
3.0 in.
[78 mm]
3-wire
14...29 vdc
common
0...20 mA out
–
100 ft. x 0.4-in. dia.
[30 M x 10 mm dia.]
3-conductor, 18 AWG
type SJTOW
Waterproof Cable
A
F
B
E
C
D
contact view
25 ft. x 0.2-in. [7,5 M x 5 mm] dia.
6-conductor, 24 AWG
shielded
color code
2-wire
WHITE
8...34 vdc***
BLACK
4...20 mA out
GREEN
case ground
3-wire
14...29 vdc
common
0...20 mA out
Instrumentation Cable
color code
2-wire
3-wire
RED
8...34 vdc***
14...29 vdc
BLACK
4...20 mA out
common
GREEN
case ground 0...20 mA out
Note: WHITE, BLUE, BROWN are not used.
*–Test pressure: 100 feet [30 meters] H2O (40 PSID) Test Medium: Air; Duration: 2 hours. ** –applies to stainless steel enclosure only. ***14-32 VDC for hazardous area option.
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
meas-spec.com
PT8420 | 3
Cable Guide Options:
2*
polyurethane cable bellows
3.75 in.
1.87 in.
3
integral cable brush
1.88 in.
1
stainless steel cable guide
1.87 in.
0
standard cable guide
G order code:
*note: all ranges up to 25 inches only
Output Signal Selection:
0...20 mA
or
4...20 mA
20...0 mA
or
20...4 mA
internal dip switches
& signal board
signal board
1 2 3 4
switch setting
1 2 3 4
output signal
1 2 3 4
The output signal direction can
be reversed at any time by
simply changing the dip-switch
settings found on the internal
signal board. After the settings
have been changed, adjustment of the Zero and Span
trimpots will be required to
precisely match signal values to
the beginning and end points
of the stroke.
To gain access to the signal board,
remove four Allen-Head Screws and
remove rear cover.
dip-switch location
VLS Option - Free Release Protection
The patented Celesco Velocity Limiting System
(VLS) is an option for PT8000 Series cable extension transducers that limits cable retraction to a
safe 40 to 55 inches per second.
How To Configure Model Number for VLS Option:
VLS 8420 0010
0020
0025
0030
0040
0050
0060
The VLS option prevents the measuring cable
from ever reaching a damaging velocity during
an accidental free release. This option is ideal for
mobile applications that require frequent cable
disconnection and reconnection. It prevents expensive unscheduled downtime due to accidental
cable mishandling or attachment failure.
VLS is NOT available for medium and high cable
tension options or 2, 5 and 15-inch stroke ranges.
-
R
A
B
C
-
D
E
F
G
1
3
8
= only available options**
creating VLS model number (example):
PT8420-0060-111-1110
1. select PT8420 model
2. remove “PT” from the model number
PT 8420-0060-111-1110
VLS + 8420-0060-111-1110
3. add “VLS”
4. completed model number !
VLS8420-0060-111-1110
**Note: please contact factory for a solution to options not supported.
version: 11.0 last updated: May 29, 2014
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
meas-spec.com
4 | PT8420