Yamatake STD910 - Section 4: Calibration; 4-1: Calibrating Analog Output Signal

Yamatake Corporation Appendix
ST3000 Smart Transmitter Series 900 Electronic Differential Pressure/Pressure Transmitter A-15
Section 4 : Calibration
This section provides information about calibrating the transmitter's analog output and
measuring range. It also covers the procedure for resetting calibration to default val-
ues.
4-1: Calibrating Analog Output Signal
You can calibrate the transmitter's analog output circuit at its and 100% levels by
using the transmitter in its constant-current source mode.
(Device setup) - (Detailed setup) - (Output Condition) - (Analog output) - (D/A trim)
Step Action/Description
1 You will be warned to remove the loop from automatic control. After
doing so, press OK.
When prompt appears, connect a precision milliammeter or volt meter
(0.03% accuracy or better) in loop to check readings. Press OK.
2 The following display prompts will appear:
• Setting field device output to 4 mA. Press OK.
• Enter meter value. Key in meter value, then press OK.
• Is field device output 4.000 mA equal to reference meter?
1 Yes
2 No
If not equal, select No, press ENTER, then key in new meter value.
(returns to “Enter meter value” prompt until field device output equals
reference meter.)
If equal, select Yes, press ENTER.
3 The following display prompts will appear:
• Setting field device output to 20 mA. Press OK.
• Enter meter value. Key in meter value, then press ENTER.
• Is field device output 20.000 mA equal to reference meter?
1 Yes
2 No
If not equal, select No, press ENTER, then key in new meter value.
(Returns to “Enter meter value” prompt until field device output
equals reference meter.)
If equal, select Yes, press ENTER.
Prompt notifies you that the field device will be returned to its original
output.