How does EJA perform temperature compensation? Does anyone have temperature compensation debugging software? Questions can be asked for a fee
Thread Content
This post was last edited by liupeiyu on 2011-10-19 at 10:21. My EJA is a flange-mounted level transmitter; after maintenance and refilling with oil, its reading keeps drifting, and I don’t know how to fix it. I want to use a temperature compensation software to communicate with the EJA in order to perform temperature compensation and correct the reading! Does anyone have such software? Software that works for Rosemount transmitters will do as well; I just don’t have such software for Brown protocol transmitters
The drift of the throttling device has nothing to do with temperature and pressure compensation; it is likely caused by a change in the medium inside the pressure sensing tube, or by defects in the transmitter. Temperature and pressure compensation is used for measuring gases, and it is generally implemented within a DCS system
Principle of temperature and pressure compensation As can be seen from equations A-1 and A-2, when ΔP or If remains constant, the flow rate of the fluid is inversely proportional to, or directly proportional to, the density of the fluid. Since the density of most fluids (especially gases) changes depending on the operating conditions, it is necessary to compensate for this density variation using temperature and pressure adjustments. 1 …………………………………………………Formula A-1 2 …………………………………………………Formula A-2 General gases According to the ideal gas law, the density ρ of general gases is directly proportional to pressure P and inversely proportional to temperature T; the relationship is as follows: 3 ………………………….…..….……Formula A-3 In the above formula, P0 represents atmospheric pressure, which is 0.1013 MPa ； ρ0: Represents the density of a gas under standard conditions ； ρ1: Represents the gas density at an operating pressure of P1 and an operating temperature of t1. Superheated steam and saturated steam Both superheated steam and saturated steam are compensated using table lookup and linear interpolation. The software table was prepared based on the \"Handbook of Properties of Water and Steam with Exergy Parameters\" compiled by Nanjing Institute of Technology.
Is there any more detailed information available? It’s a flange-mounted type, without a flow meter