Answer / ralu

Steam Service (Filling the water legs)
1. Ensure that the steam line is depressurized with no steam.
2. Check the transmitter for a dry zero of 4 mA with no water loss.
3. Attach hose connection valve to high side vent DVH. See Figure 3-3.
4. Attach a water supply to the hose connection. The water supply
should have a maximum psi of 100.
5. Open the high and low manifold valves MH and ML and equalizer
valve ME (MEH and MEL for 5-Valve Manifolds).
6. Ensure low side vent DVL is closed.
7. Open the hose connect valve for a minimum of 30 seconds.
Water will flow through both the high and low chambers and
into the pipe.
8. Close the high side manifold valve MH for 30 seconds to force water
to the ML side.
9. Re-open the MH valve.
10. Open low side vent DVL until no air is observed.
11. Close the low-side vent DVL.
12. Close the hose connect valve and remove hose.
13. Close both manifold high side valve MH and manifold low side valve
ML.
14. Check the transmitter zero by noting the output. If the signal reads
outside of the range 3.98 mA to 4.02 mA, air is probably still in the
system; repeat this procedure from step 2, and trim sensor if
necessary.
15. Open the manifold high side valve MH.
16. Close equalizer valve ME (for 5-Valve Manifolds first close valve
MEL, then close valve MEH).
17. Open the manifold low side valve ML. The system is now operational.

generally transmitter power supply having some range(12v to 35v) but the out put(4-20 mA) must same for given input.If we vary the power supply voltage then output mA also to be change according to V=IR. Is there any voltage regulator in the transmitter ?

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