Azbil PTG71, Руководство пользователя

Страница: 71 / 84

Azbil Corporation Calibration
Model PTG71 / 72 - Smart Pressure Transmitter 9-1
Chapter 9 : 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
values.
9-1 : 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)
CAUTION
If this operation is executed when the process is in automatic control mode, the output
may vary, resulting in a hazardous operation status.
Be sure to switch the loop control mode of the process to Manual before performing
this operation.
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.