GE PT878 user manual Setting Error Limits, Signal Error Limits

Chapter 8. Servicing the PT878

8.9 Setting Error Limits

The Error Limits option enables you to set limits for an incoming signal. When the signal falls outside the programmed limits, an error indication appears. To enter this option, scroll to the Error Limits entry on the Service Menu and press [ENTER]. The screen appears similar to Figure 122 below.

Signal Error Limits

Programming

Signal

Velocity

Amplitude

Min		Max
40	85
			m/s
-12	12
10		34

Sound Speed (±) Acceleration

20%

15 m/s

Cancel

OK

Figure 122: Signal Error Limits Option

1.The first prompt asks for the minimum and maximum limits for the transducer signal received by the PT878. The default values are 40 for minimum and 85 for maximum. The E1: LOW SIGNAL error message appears if the signal strength falls below the limit programmed here.

To enter the minimum signal

a.Press [ENTER] to open the text box.

b.Use the numeric keys to enter the desired value.

c.Press [ENTER] to confirm your entry.

184 Transport® Model PT878 Portable Liquid Flowmeter User’s Manual