Emerson Exchange 365

Hi Kitndavj

Yes there is a way to easily reset a 3051S product to factory settings. There are actually 2 different resets that you can look at. A little background here on the transmitter itself first though may be helpful. The transmitter has 2 output trims that affect the 4-20. First is trim feature that adjusts the pressure readings. This is a sensor trim and it is used to actually change the digital reading of what pressure is within the transmitter. A common application where you would trim the pressure is to remove the effects of mounting the transmitter like with a wet-leg installation to measure level in a tank. If the leg filled with process shifts the pressure by a couple of inches for example, these can be removed as it isn’t really reflective of the actual tank level. The 2nd trim feature in the transmitter is actually around the analog output. This trim is used to remove analog 4-20 inaccuracies.

Many times when the devices are installed in the field, these 2 trims can be confused and so someone may think they are calibrating the transmitter (a sensor trim) when they are just trimming the analog 4-20 (which doesn’t affect the digital meaning of pressure in the transmitter, rather just adjusts the ma output).

So with that background there are 2 factory resets, called “Recall Factory Trim”. So in the interface you can find a “Recall factory trim - Sensor trim” and the other is “Recall factory trim - analog Output”. Look for these in whatever interface you have to access the device (field communicator, AMS, etc). If you can’t find, let me know and we can help further.

In terms of zeroing the DP pressure with static pressure present, there can be static pressure affects. The 3051S minimizes these affects, but when zeroing the flow reading, you can do this at pressure to minimize these effects. The 3051S does have temperature compensation so the temperature affect should be minimized so time of day shouldn’t bother you too much. In each of the cases, there is a spec for them for the product, and if you would like more information, feel free to drop me a note Wally.Baker@Emerson.com.

Thanks

Wally