sex
102
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Loop Isolator
Instruction Manual
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1.0 INTRODUCTION
These instructions refer to the above model. Supplementary
sheets are attached if the unit has special options or features.
For detailed specifications, refer to page 4 or the Data Bulletin.
All ADTEeH instruments are factory calibrated. Unless
otherwise marked the sex 102 is calibrated for 4-20 mA input
and 4-20ma output in 0-750 ohm range. Adjustments are
normally not necessary. A simple check should be performed
to verify calibration before installation to ensure that it matches
the field requirement.
2.0 GENERAL DESCRIPTION
The ADTEeH SCX 102 is a two wire input loop powered
isolator that accepts a 4-20ma input signal and provides an
isolated 4-20 mA output signal. The transmitted 4-20 mA
signal in electrically isolated from the output receiving device,
thus making it possible to interface instrumentation that is at
different ground potential.
The SCX 102 derives its operating power from the input signal
and does not need an external operating power supply.
The input connections are made on the top side and provide
for alternate connection to facilitate input current monitoring by
use of a milliammeter. Voltage output signals may be obtained
by adding external output shunts e.g. 250n for 1-5 vdc. An
output voltage clamp is provided as standard to protect
against accidental open circuit on the output.
The standard mounting is din rail types 'G' and 'T' 32mm and
35mm respectively. Many optional mounting configurations
are provided as shown in Section 10.0. •
The primary features of the sex 1 02 are:
• Lowest input voltage drop in its class
• No recalibration required over 0-750n
• Extremely high accuracy: ±0.1 % including linearity,
repeatability, hysteresis and resolution.
• Reverse polarity protection
• Convenient current monitoring on the input
• Extremely compact - less than 1 inch wide
• Din mount - standard
• Surface and snaptrack mount n/c optional
3.0 INSTALLATION
The instrument is supplied in a non-metallic general purpose
Din rail mount enclosure as standard.
NEMA 4,
7 or 12
enclosures are optionally available. Installation area/location
must agree with the supplied instruments including operating
temperature and ambient conditions. For detailed mounting
and installation refer to page 4.
Electrical Connections
The wire used to connect the instrument to the control system
1/0 should be a twisted pair(s) and sized according to normal
practice.
Six (6) position compression terminals are provided for 1/0
connections. Refer to the connection diagrams given below.
Controls
The sex 102 is supplied with two multiturn controls. Multiturn
ZERO and SPAN controls are provided to calibrate the
SCX 102. The controls are accessible through the instrument
front panel for ease of adjustment.
4.0 MAINTENANCE
These instruments are electronic and require no maintenance
except periodic cleaning and calibration verification. If the unit
appears to be mis-operating it should be removed and checked
on the bench. If defective, it should be replaced with a known
good spare and the defective one returned for factory test and
service for total reliability check.
5.0 CONNECTIONS
Common standard connections are shown below and on the
instrument face plate and also on the Data Bulletin.
ADTECH
scx-102
RUW)
>PTIONAL GROUND
!SO-7!50 ohm■
CONNECTION
-
(- note 2)
OPTlONAL GROUND
CONNECTION
Current
Meter
- (25 dins 1111)
RUW)
CAUTION: The output load must be always connected.
-1-
190-A-SCX102-A
