The ball pass indicator, which is used to determine whether the pigging passes or arrives, is usually placed at the transmitter and receiver ends of the boiler and is placed in the key position on the pipe line.
There are three ways to connect:
1, 2 "welding base, that is Nipple; code N;
2 and 2 flanges, Flange, code F,
3, 2 "welding base turn NPT, that is R2Adjustable, code R2AJ.
There are three trigger options:
1, two-way, that is, Bi-dierctional; code B, you can omit;
2, two-way feather type is bi-directional Feather, code F;
3, one-way, that is, Uni-directional, codenamed U.
There are three types of displays (outputs) available:
1, flag display, manual reset: Code B
2, flag combination switch output, manual reset: Code C
3, digital, date, time display, combined with switch output, automatic reset: Code D;