RT8420
0–45° to 0–200 Turns • 0..20mA • 4..20mA
Industrial Grade Rotational Position Sensor
Absolute Rotary Position up to 200 turns
Aluminum or Stainless Steel Enclosure Options
IP68 / NEMA 6 • Hazardous Area Certification
GENERAL
Full Stroke Range Options
0-0.125 to 0-200 turns
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
Enclosure Material Options powder-painted aluminum or stainless steel
Sensor
plastic-hybrid precision potentiometer
Potentiometer Cycle Life see ordering information
Shaft Loading
up to 10 lbs. radial and 5 lbs. axial
Starting Torque (25ºC)
2.0 in-oz., max.
Weight, Aluminum (Stainless Steel) Enclosure
3 lbs. (6 lbs.) max.
ELECTRICAL
Input Voltage
see ordering information
Input Current
20 mA max.
Maximum Loop Resitance (Load)
(loop supply voltage - 8)/0.020
Circuit Protection
2.5” [64 mm]
4.0” [102 mm]
Celesco’s model RT8420 provides extended rotational position feedback from as little as 1/8 of a turn f.s. all the way up
to 200 turns f.s. The RT8420 combines the superb linearity
and resolution of a plastic-hybrid potententiometer with
the durability of Celesco’s 4...20 mA circuit to provide an accurate and reliable electrical signal over all ranges.
Additionally, the RT8420 has fully accessible zero and span
settings allowing precise matching of the output signal to
the required measurement.
38 mA max.
Impedence
100M ohms@100 VDC, min.
Output Signal Adjustment
Zero Adjustment
from factory set zero to 50% of full stroke range
Span Adjustment
to 50% of factory set span
Thermal Effects, Zero
0.01% f.s./ºF, max.
Thermal Effects, Span
0.01% f.s./ºF, max.
Output Signal:
4...20 mA*
(0% fs.)
(100% fs.)
EMC COMPLIENCE PER DIRECTIVE 89/336/EEC
Emission/Immunity
EN50081-2/EN50082-2
ENVIRONMENTAL
Enclosure
Operating Temperature
Vibration
NEMA 4/4X/6, IP 67/68
*Optional 3-wire, 0...20mA output signal available.
-40° to 200°F (-40° to 90°C)
up to 10 g to 2000 Hz maximum
20630 Plummer Street • Chatsworth, CA 91311
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
meas-spec.com
RT8420 | 1
Outline Drawing:
2.63 [66,8]
5.41 [137,4]
Ø 2.49 [63,2]
2.49 [63,2]
2
2
30º
1.25 [31,8]
1
4.04 [102.6]
0.38 [9,7]
.25-inch shaft option
+.0000
Ø .2497 in.
-.0003
1 mounting holes:
1.00 [25,4]
0.250 [6,35]
6mm shaft option
for .25 in. shaft option, mounting holes are threaded
#10-32 x 0.375 deep 120° apart on a 2.00 inch dia. BC
+.000
Ø 5.995 mm
-.025
Shaft Detail
for 6mm shaft option, mounting holes are threaded M6
x 9 mm deep 120º apart on a 50,8 mm dia. BC
0.92 [23,4]
2 reference mark:
full counter-clockwise position - align mark on shaft to mark
on face for start of measurement range
DIMENSIONS ARE IN INCHES [MM]
tolerances are ±0.02 in. [±0,5 mm] unless otherwise noted
Ordering Information:
Sample Model Number:
Model Number:
RT8420 - 0005 - 111 - 1110
RT8420-
R
order code:
Full Stroke Range:
R order code:
clockwise shaft rotations, min:
accuracy (% of f.s.):
potentiometer cycle life*:
R order code:
clockwise shaft rotations, min:
accuracy (% of f.s.):
potentiometer cycle life*:
-
A
B
C
- 1D
E
F
0
R
A
B
C
E
F
G
range:
enclosure:
shaft diameter:
mounting style:
output signal:
electrical connection:
5 turns (clockwise shaft rotations)
aluminum
.25 inches
face mount
4...20 mA signal increasing clockwise
6-pin plastic connector
R125
0R25
0R50
0001
0002
0003
0005
0010
0020
0.125
1.25%
0.25
1.25%
0.50
0.5%
1
0.5%
2
0.5%
5
0.2%
10
0.15%
20
0.15%
2.5 x 106
2.5 x 106
2.5 x 106
2.5 x 106
2.5 x 106
3
0.2%
5 x 105
5 x 105
2.5 x 105
2.5 x 105
0030
0040
0050
0080
0100
0120
0140
0180
0200
30
0.15%
40
0.15%
50
0.15%
80
0.15%
100
0.15%
120
0.15%
140
0.15%
180
0.15%
200
0.15%
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
2.5 x 105
*–number of times the sensor shaft can be cycled back and forth from beginning to end and back to the beginning before any measurable signal degradation may occur.
Enclosure Material:
1
2
powder-painted aluminum
303 stainless steel
A order code:
Shaft Diameter:
B order code:
1
2
3
4
0.25-in. diameter
6 mm diameter
0.25-in. dia. w/flats
6 mm dia. w/flats
.2497 in. (+.0000 –.0003)
5.995 mm (+.000 –.025)
0.33 in.
0.025 in.
8.4 mm
0.64 mm
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
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2 | RT8420
Ordering Information (cont.):
Mounting Style:
C order code:
1
2
face mount
flange mount
Ø 4.1 [104.14]
mounting holes spaced 120º
apart on 2.00 [50,8] BC
.28 [7,1] wide
mounting slot on a
Ø3.50 [88,9] BC
6mm shaft option
threaded M6 x 9 mm deep
30º
.25 in. shaft option
#10-32 x 0.375 inch deep
1.38 [35,1]
Output Signals:
E order code:
output signal options:
1
2
3
4
4...20 mA
20...4 mA
0...20 mA
20...0 mA
20
4
ccw
20
cw
sensitivity:
wiring configuration:
input voltage:
4
ccw
{
Example:
ordercode = 1 = 4...20 mA
20
0
cw
16 mA/full stroke ±0.25%
2 – wire
8 – 34 vdc
Electrical Connection:
20
ccw
cw
0
ccw
cw
20 mA/full stroke ±0.25%
3 – wire
14 – 29 vdc
max ccw
max cw
= 20 mA
= 4 mA
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.]
18 AWG, type SJTW
5
6
7
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
100 ft. x 0.4-in. dia.
[30 M x 10 mm dia.]
18 AWG, type SJTW
10 ft. x 0.4-in. dia.
[3 M x 10 mm dia.]
18 AWG, type SJTW
6-pin Mating Plug
pin
A
B
C
D
{
2-wire
8...34 vdc
4...20 mA out
–
case ground
3-wire
14...29 vdc
common
0...20 mA out
–
100 ft. x 0.4-in. dia.
[30 M x 10 mm dia.]
18 AWG, type SJTW
Waterproof Cable
A
B
F
C
E
D
25 ft. x 0.2-in. dia.
[7,5 M x 5 mm dia.]
24 AWG, shielded
3/8-in. [9 mm] max cable dia.
16 AWG max conductor size
connector: MS3102E-14S-6P
mating plug: MS3106E-14S-6S
100-ft. [30 M]
waterproof cable
F order code:
IP 67, NEMA 6
2.4 in.
[60 mm]
3.0 in.
[78 mm]
Notes:
IN [MM]
1.00 [25,4]
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
contact view
Instrumentation Cable
color code
RED
BLACK
WHITE
GREEN
2-wire
8...34 vdc
4...20A out
n/a
case ground
3-wire
14...29 vdc
common
n/a
0...20 mA out
* –Test pressure: 100 feet [30 meters] H2O (40 PSID); Test Medium: Air; Duration: 2 hours.
** –NEMA 4X applies to stainless steel enclosure only.
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
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RT8420 | 3
Output Signal Selection:
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.
20...0 mA
or
20...4 mA
signal board
internal dip switches
& signal board
1 2 3 4
0...20 mA
or
4...20 mA
1 2 3 4
switch setting
1 2 3 4
output signal
dip-switch location
To gain access to the signal board, remove four Allen-Head
Screws and seperate the two case halves.
version: 11.0 last updated: November 18, 2013
tel: 800.423.5483 • +1.818.701.2750 • fax: +1.818.701.2799
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4 | RT8420