4.3.4.7 RA tank (optional)
1 DCM
2 Leak indicator
3 Terminal box (customer in-
terface)
4 Level transmitter
5 Level transmitter
6 Sampling
7 Hand hole
8 Pressure equalization safety
assembly
9 RA supply to system
10 RA return from system
11 Overflow
12 Pre-feed module
The RA tank, RA lines between RA tank and PFM and the tank sensors are available from MTU. MTU specifies
tank size, sensor types/positions and the RA lines for customers designing or using their own tanks. In either
case, the DCM required to connect the tank sensors to the ECU is supplied by MTU.
The RA tank comprises the following sensors:
2 level sensors:
Signaling a refill warning indicating remaining operating times to the operator
1 level sensor:
Indicating the minimum level for DU circulation cooling (RA dosing stops at this level and the final warn-
ing is raised)
1 temperature sensor:
Identifying frozen RA (both for heated and unheated RA dosing systems)
All sensors on the RA tank are connected to the ECU via DCMs.
The RA tank must feature hydraulic supply and return connections as the dosing units are cooled by a con-
stant flow of circulating RA. A filter is required in the supply line to protect the dosing system.
RA freezes at temperatures below approx. -11 °C. MTU recommends heating the RA tank at all times in envi-
ronments where temperatures of below -8 °C can be expected (→ Page 88).
Mis-filling with diesel fuel may damage seals and hoselines resulting in leaking fuel and fire. Never attempt to
start-up or operate the machine/system after mis-filling.
MS15065/01E 2019-01
| RA Dosing System | 87
TIM-ID: 0000072431 - 001
