T773 datasheet(2/4 Pages) ETC

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Calibration

Factory settings are:

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%

≥90%

≥80%

≥70%

≥60%

≥50%

≥40%

≥30%

≥20%

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

≤10%

≤20%

≤30%

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).

Table 1: T773 Input Ranges

Top View Diagram

T805 Explosion Proof Housing (Optional)

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 indus-

trial field environments. A sealed, diecast

aluminum housing protects against corro-

sion, moisture, dust and electrical noise such

as radio-frequency (RFI) and electromagnetic

(EMI) interference.

For protection against extreme moisture, hose-

directed water (NEMA 4) or hazardous envi-

ronments, use the T805 explosion-proof hous-

ing. The T805 provides a 1/2" and 3/4" FPT

port for operation in harsh process environ-

ments. 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.

Range

Switch Position

Input Limits

Minimum Span

0 to 18KHz

3600Hz

0 to 9KHz

1800Hz

0 to 2100Hz

420Hz

0 to 525Hz

105Hz

Key:

= 1 = ON or Closed

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