Where are pressure indicating transmitters located in a Type 4 system?

In a Type 4 system, the pressure indicating transmitters are strategically installed to provide accurate pressure readings that are essential for monitoring system performance and safety. The correct placement is on the issue line downstream of the 136AF-9B, which is indicative of the system's flow direction after the air flow control unit.

This placement ensures the transmitter measures the pressure in the line where the fluid has already passed through the control unit, providing a true representation of the pressure that is being delivered to the system or application. Accurate pressure readings at this point are critical for ensuring that the system operates within its designed parameters, enabling effective troubleshooting and maintenance.

Locating pressure transmitters in the right section of the system is key to their functionality; they need to be positioned such that they can monitor the conditions affecting delivery without interference or unaccounted pressure variations that could arise from other system components.