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Description
The T703 has 16 overlapping
input ranges which are field
select- able via top-accessed
DIP switches (see Table 1).
The T703can accept input voltage
spans from 20mV to 200 volts
and input current spans from
1mA to 50mA. Bipolar selection
modifies the unipolar range
to include a negative offset
(e.g. 200V becomes 100V). The
T703 provides 1000Vrms of transformer-coupled
isolation and 120VAC continuous
input overload protection. The
top-mounted super bright LED
illuminates when the loop current
is above 3.3mA. Standard surface
mount RFI filters reject walkie-
talkie interference and noise.
Current output is in proportion
to the selected voltage or current
input.
The
T703 has 80% zero "turn-up"
and 80% span "turn-down"
adjustments within any user-selected
input range. For example, Range
11 of Table 1 specifies 0 to
100V with a minimum span of
20V (100V - 20V = 80V, or 80%).
This 80% adjustability allows
the user to field-calibrate
the unit from the maximum (0
to 100V) down to any minimum
(20V) span (e.g. 25V to 45V)
within the selected 0 to 100V
range. The same is true in any
user-selectable range: all spans
are field adjustable from 20%
(minimum span) to 100% of the
specified range.
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Applications
The T703 is useful in any application
requiring an isolated two-wire
loop current from a DC source.
Typical applications include
long distance signal transmission
and the elimination of ground
loops. The output of the T703
can be used to drive a digital
meter for direct display, or
to interface with a computer
for monitoring and control applications.
The
model T703 is FM approved for
intrinsically safe operation,
entity, Classes I, II, III,
Division 1, Groups A-G and Nonincendive,
Class I, Division 2, Groups
A-D hazardous when installed
per manufacturer's drawing 790-0028-00.
The
model T703 is CSA approved for
intrinsically safe operation
for Class 1, Division 1, temperature
code T3C, Groups A, B, C and
D hazardous locations when installed
per manufacturer's drawing 790-0025-00.
Refer to model F703 for NEMA
4, FM/CSA/CENELEC approved explosion-proof
housing.
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