T761
AC Input Isolating Field Configurable
Two-Wire
Transmitter |
TECHNICAL SPECIFICATION (T761)
|
| Input Span
Range (Max/Min) |
|
See table 1
(in datasheet) |
| Leadwire Resistance Effect |
|
<0.25 uV/Ohm |
| Input
Impedance |
|
|
|
Ranges 1-8: |
|
>1M
Ohm |
|
Ranges 9-12: |
|
0.5 Ohm shunt |
| Output Span |
|
4-20mA/10-50mA, switch selectable |
| Minimum
Output Current |
|
3.3mA, typical |
| Maximum Output Current |
|
|
|
4-20mA: |
|
24mA, typical |
|
10-50mA: |
|
58mA,
typical |
| Supply-Voltage Range |
|
|
|
4-20mA: |
|
12 to
80VDC |
|
10-50mA: |
|
12 to 60VDC |
| Maximum Change in supply Voltage Effect |
0.05% of
span |
| Maximum
Change in Load Effect |
|
0.05% of span |
| Loop Voltage Drop |
|
12VDC @
20mA |
| Stability |
Zero: |
|
±0.02% of span/°C,
typical, or 10uV/°C, whichever is greater |
|
Span: |
|
±0.02% of span/°C, typical |
| Overall Accuracy
(Includes Linearity,Hysteresis and Stability) |
|
|
|
±0.5%
of any adjusted span (50-400Hz sine wave input), max. |
| Frequency
Response (±0.5dB) |
|
20Hz to 3KHz; average reading
calibrated to sine wave input |
| Maximum DC Input Component |
|
50% of
range |
| Zero and
Span Adjustability |
|
80% of any selected range |
| Repeatability |
|
|
±0.05% of span, typical |
| Response Time |
|
|
500ms, typical |
| Output Ripple |
|
|
0.5% of
span, rms, typical |
| RFI Effect
(5W, 470MHz at 3 Ft.) |
|
<1% of span error |
| Isolation |
|
|
600V DC
maximum, input to output |
| Temperature Range |
|
|
|
Operating: |
|
-40 to
80°C (-40 to 176°F) |
| Weight |
|
|
0.64lbs |
Calibration
- Open the access lid on the top of the unit (see Top View
Diagram).
- Select the output range using switch S1. The CLOSED
position selects a 10-50mA output. The OPEN position selects a 4- 20mA
output.
- Select the input range from Table 1 and configure
switches S2 through S6.
- Connect the input to a calibrated AC voltage or current
source. Connect the output loop to a voltage supply and monitor the output
current (refer to terminal wiring).
- Set the calibrator to the desired minimum.
- Adjust the coarse zero rotary switch to either 4mA or
10mA. Adjust the fine zero for exact calibration. Note that it may be necessary
to switch coarse zero up or down one position.
- Set the calibrator to the desired maximum and adjust the
fine span to obtain an output of either 20mA or 50mA. Repeat steps 5-7, if
necessary for best accuracy.
Field Mounting
The T761
is designed for installation in industrial field environments. A sealed,
diecast aluminum housing protects against corrosion, moisture, dust and
electrical noise such as radio-frequency (RFI) and electromagnetic (EMI)
interference.
For protection against extreme moisture, hosedirected water
(NEMA 4) or hazardous environments, use the T805 explosion-proof housing. The
T805 provides a 1/2" and 3/4" FPT port for operation in harsh process
environments. The T805 is FM and CSA certified for use in Class I, Groups B, C
& D and Class II, Groups E, F & G hazardous locations.  |
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