Panametrics Sentinel LCT, User Manual

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Sentinel LNG User’s Manual 191
Chapter 8. Maintenance
Chapter 8. Maintenance
8.1 Calibration
In the CALIB menu, the user can calibrate and trim the analog output and inputs and check other meter functions.
This chapter also covers updating
Sentinel LNG
software over the RS232 interface.
Before performing calibration of the
Sentinel LNG
, be sure the following equipment is available:
• Current meter capable of precisely measuring 4 to 20 mA current levels
• PC with RS232 Cable and Hyperterminal software (available on Windows operating systems)
While following the programming instructions, refer to Figure 236 on page 217.
8.1.1 Updating Sentinel LNG Instrument Software
1. To set up the RS232, connect one end of a 9-pin RS232 cable to the COM-1 serial port on a PC and the other end to
Com Port I/O on terminal block TB2 on the
Sentinel LNG
, as described in Chapter 2, Installation .
WARNING!
Use RS232 connections in Non-Hazardous areas only.
Note: The RS232 cable connection is not limited to the COM-1 serial port of the PC. Connect the RS232 cable to any
available RS232 serial port on the PC, and follow the same instructions as for the COM-1 port.
2. On your PC, set up the Hyperterminal program.
Note: The use of Hyperterminal is shown here as an example. If you are using a different communications
software, see its manual for detailed instructions.
a.
From the PC Start Menu, click Programs/Accessories/Communications/Hyperterminal to open the Hyperterminal
window.
b. If the call is not connected, click on New Connection and enter a name. Click OK.
c. In the Connect To window, select COM 1 as the desired port.
d. In the Properties window, set the following parameters:
• Bits per second: 115200
• Data bits: 8
• Parity: None.
• Stop Bits: 1
• Flow control: None