|
Input Range:
|
1
|
|
Output Range:
|
4-20mA
|
1. Open the access lid on the top of the unit (see Top View Diagram).
2. Select the output range using switch S6. The CLOSED position selects a 10-50mA output. The OPEN position selects a 4-20mA output.
3. Select the input range from Table 1 and configure switches S1 through S5.
4. Determine the percent of span by the ratio of the desired maximum input to the input limit in Table 1 (e.g., 1000Hz/2100Hz = 48%).
5. Set the step Span rotary switch to the desired percent of span (e.g., 48% = position 4).
|
Percent of Span
|
Position
|
|
100%
|
A
|
|
>90%
|
9
|
|
>80%
|
8
|
|
>70%
|
7
|
|
>60%
|
6
|
|
>50%
|
5
|
|
>40%
|
4
|
|
>30%
|
3
|
|
>20%
|
2
|
6. Determine Zero turn-up % by the ratio of desired minimum input to the desired maximum input (e.g., 0/1000Hz = 0%).
7. Set step Zero turn-up switch to offset %. (e.g., 0% = position 0).
|
Zero Turn-Up %
|
Position
|
|
0%
|
0
|
|
>10%
|
1
|
|
>20%
|
2
|
|
>30%
|
3
|
8. Connect the input to a calibrated frequency source. Connect the output loop to a voltage supply and monitor the output current (refer to the terminal wiring).
9. Set the calibrator to the desired minimum and adjust the fine zero to obtain an output of either 4mA or 10mA.
10. Set the calibrator to the desired maximum and adjust the fine span to obtain an output of either 20mA or 50mA. Repeat steps 9 and 10, if necessary, for maximum accuracy.
Note: If loop current "swings" on input ranges 1-2, close S-5 for extra filtering.
Field Mounting
The T773 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.
