Series 654T Transmitter User's Manual Voltage Input
___________________________________________________________________________________________
- 7 -
6.0 SPECIFICATIONS
654T-0600
, Dual Channel Voltage Input, 2-Wire Transmitter
General:
The Model 654T-0600 2-Wire Transmitter accepts
two multi-range voltage input signals, provides input-to-output
and channel-to-channel isolation, and generates two, 4 to
20mA, 2-wire output signals. Transmitter channels are
independent and isolated, and connected in two-wire fashion,
with the output signal and power sharing the same leads.
These transmitters are DIN-rail mounted with plug-in type
terminal blocks. Units are fully configured via DIP switches
and front-panel toggle switches. Non-volatile
reprogrammable memory within the module stores calibration
and configuration information.
MODEL NUMBER DEFINITION
Transmitters are color coded with a white label. The prefix
“6” denotes the Series 600 family of transmitters and isolators,
while the “T” suffix specifies that this device is primarily a process
transmitter.
654T:
Dual Channel Voltage Input, 2-Wire Transmitter
-0600:
The four digits of this model suffix represent the following
options, respectively:
0 = Option specifier - no option for this model;
6 = Output is DC current;
0 = Enclosure is DIN rail mounted;
0 = Approvals: cULus Listed, UL file E199702 &
E202242.
Hazardous Locations: Class I; Division 2; Groups A,
B, C, D.
INPUT SPECIFICATIONS
Unit must be wired and configured for the intended input
range (see Installation Section for details). The unit can be
configured to accept voltages within any of the input ranges
described below via the DIP switches. The toggle switches are
used to scale the input to the 4-20mA output. The following
paragraphs summarize this module’s input ranges and applicable
specifications.
DC Voltage:
User-configured for the following DC voltage
ranges:
78mV,
156mV,
313mV,
625mV, 0-1.25V, 0-
2.5V, 0-5.0V, and 0-10.0V. Note that the unit will permit
calibration below 0V, down to -0.65V typical, for the 0-1.25V,
0-2.5V, 0-5V, and 0-10V ranges.
Voltage Input Reference Test Conditions:
78mV input
range configured with a 50mV span; Ambient Temperature =
25
C; Power Supply = 24V DC; R-load=500
.
Input Impedance:
110K
typical.
General Input Specifications
Accuracy:
Better than
0.1% of span, typical. This includes
the effects of repeatability and terminal point conformity,
but does not include sensor error.
Resolution:
Effective resolution is controlled by the output
stage which resolves to 1 part in 6546 for the nominal 4
to 20mA output span.
Response Time:
980ms typical, for an analog output to
reach 98% of the final value for a step change in input.
Input Filter Bandwidth:
-3dB at 3Hz, typical.
Input bias current:
25nA typical.
Noise Rejection (Normal Mode):
Better than 40dB @
60Hz, typical with 100
input unbalance.
Noise Rejection (Common Mode):
Better than 140dB @
60Hz, typical with 100
input unbalance.
Analog to Digital Converter (A/D):
A
16-bit
-
converter.
Input Conversion Rate:
Every 50ms or 20 conversions per
second.
Input Filter:
Normal mode filtering, plus digital filtering
optimized and fixed per input range within the
-
ADC.
OUTPUT SPECIFICATIONS
DC Process Current Output Specifications:
Output Range:
4 to 20mA DC, 3.8 to 23.8mA range typical.
Output Ripple:
Less than
0.1% of output span.
Output Limiting:
Output current is limited to less than
25mA, typical.
Output Maximum Current:
23.8mA typical, 25mA
maximum.
Output Compliance:
11V Minimum, 12V Typical.
Output Resolution:
The output stage resolves to 1 part in
6546 for a 4 to 20mA output span.
General Output Specifications:
Response Time:
For a step change in input voltage, the
output reaches 98% of its final value in less than 980ms
typical, with a 500
load. Response time will vary with
load resistance.
Accuracy:
Better than
0.1% of output span (
16uA) typical.
This error includes the combined effects of isolator
repeatability, hysteresis, terminal point linearity, and
adjustment resolution. It does not include sensor error.
Accuracy Versus Temperature:
Better than ±0.010% of
input span per
F (
0.018% per
C or
180ppm/
C) over
the ambient temperature range for reference test
conditions. This specification includes the combined
effects of zero and span drift over temperature.
Output Power Supply:
12-36V DC Class 2, 24mA. The
supply voltage must be chosen to provide full-scale
current to the load (0.020*R), plus 12V to the isolator
terminals, plus any line drop. Reverse polarity protection
is included.
Power Supply Effect:
Less than
0.001% of output span
effect per volt DC change, or
0.015% of output span
effect per volt peak-to-peak of 60Hz/120Hz power supply
ripple.
Output Load Resistance Effect:
Less than
0.01% of
output span effect for
100
change in load resistance.
Load Resistance Range Equation:
R
load
(Maximum) =
(V
supply
- 12V)/0.020A (assuming negligible line drop). At
a 24V DC supply, R
load
= 0-600
.
Note:
For sensitive applications with high-speed
acquisition rates, high frequency noise may be reduced
by placing a 0.1uF capacitor directly across the load.
Output Conversion Rate:
Every 50ms or 20 conversions per
second.
