Manuale d’uso / di manutenzione del prodotto LTM-300 del fabbricante Emerson
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L TM-300 Magnetostrictive Level T ransmitter Instruction and Maintenance Manual T able of Contents Section 1. T ransmitter Overview Page 1.0 General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Level T ransmitter .
The L TM-300 is an elec tronic field instrument, suitable for installation i n h a z a r d o u s a n d n o n - h a z a r d o u s i n d u s t r i a l a r e a s . Te s t i n g a n d certification has been obtained from different agencies for installation in specific areas.
The L TM -300 is an assembly of two major components: • The S ensor T ube Assembly . This a 5/8” diameter stainless steel probe, sealed on one end, with the magnetostri ctive wavegui de in its center . In addition to the magnetostrictive wa veguide, the tube also houses the optional temperature sensor and the detec tor electronics.
Level/Interface. A second float ma y be added below the first one, and the second output will be calibrated automa tically. The second time interval is measured in the same manner as the first and added to the first to derive the position of the heavier floa t.
Ambient T emp. Range -20°C ... +40°C (-4°F ... 104°F) Humidity Limits: SAMA PMC 31.1-5.2 Vibration Limits: SA MA PMC 31.1-5.3 RFI Limits: SAMA PMC 31.
Displays Level Measur ement Display - in inches Level measur ement Display - in centimeters Level Measur ement Display - in millimeters Level Measur ement Display - in feet Level Measur ement Display .
6.4 Star t-Up f or Gage -M ounted L TM T ransmitters If the transmitter does not appear to calibrate properly, or has an erratic output, check the deadband of the sensor tube and ensure that the float is within the active region of the probe.
All MagT ech produc ts are warran ted against defects in materials and workmanship of one year from date of shipment. The level gage chamber and process connections are guaran teed for the life of the tank or vessel to which it is attached . Floats are guarant eed for two years .
When the HART Communicator is connected to the transmitter and turned on, the first screen that is seen by the user is the root menu screen. If the transmitter is configured as L evel Only or Level plus T emperature, the scr een to the left shows the information displayed to the user .
If the user selects Operation Status from the Diagnostics screen, he is able to view all of the status bits indicating the health of the transmitter operation. If the entry is labeled OFF , that means that the entr y is in normal operating conditions.
The HART Communicator inf orms the user that the maintenance flags have been r eset when the transmitter has replied to the reset command. The user must acknowledge this information by pressing OK to continue . The user is then notified that the loop may now be returned to automatic contr ol.
If it is desired to trim the digital level value, he may selec t a single point zero trim or a full level trim that requires the input of both the zer o l e v e l v a l u e a n d s o m e o t h e r l e v e l value preferably near the end of the level measurement tube .
Starting at the Calibration screen, select the Zero L evel T rim procedure . This procedure trims the Level digital v alue measurement at the position that the user desires to be the zer o refer ence position.
The HART Communicator now requests that the level floa t be set to the desired level upper trim point. The second trim point can be any other level point but it is recommended that this point be as far away fr om the zero point as possible.
The user is then notified that the loop may now be returned to automatic contr ol. After the user presses OK the HART Communicator r eturns to the Calibration screen. The HART Communicator is now at the starting screen for the Zero T emper T rim . F ull T emperature T rim Starting at the Calibration screen, select the F ull Level Trim procedure .
The user is then notified that the loop may now be returned to automatic contr ol. After the user presses OK the HART Communicator r eturns to the Calibration screen.
The HART Communicator will display this screen r eminding the user that the loop should be removed fr om automatic control before pr oceeding. When this has been done, the user must press OK to continue . The user is then notified that the loop may now be returned to automatic contr ol.
The next screen gives the user a choice to set the 4mA or 20mA values or to Exit the procedur e. Here the user will select the 4mA menu position. The HART Communicator r equests the user to set the Lev el (or Inter face) to the position that is to provide the 4mA loop curr ent output.
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Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Emerson LTM-300 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Emerson LTM-300 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Emerson LTM-300 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Emerson LTM-300 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Emerson LTM-300, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Emerson LTM-300.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Emerson LTM-300. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Emerson LTM-300 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
