SMAR DT302, Owner'S Operation And Maintenance Manual

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DT302 – Operation, Maintenance and Instructions Manual
4.2
If the problem is not presented in the table above follow the Note below:
NOTE
The Factory Init should be tried as a last option to recover the equipment control when the equipment presents
some problem related to the function blocks or the communication.
This operation must only be carried out
by authorized technical personnel and with the process offline, since the equipment will be configured
with standard and factory data.
This procedure resets all the configurations run on the equipment, after which a partial download should be
performed.
Two magnetic tools should be used to this effect. On the equipment, withdraw the nut that fixes the
identification tag on the top of the housing, so that access is gained to the "
S " and " Z " holes.
The operations to follow are:
1) Switch off the equipment, insert the magnetic tools and keep them in the holes (the magnetic end in the
holes);
2) Feed the equipment;
3) As soon as Factory Init is shown on the display, take off the tools and wait for the " S " symbol on the right
upper corner of the display to unlit, thus indicating the end of the operation.
This procedure makes effective the entire factory configuration and will eliminate eventual problems with the
function blocks or with the equipment communication.
Procedure to change the DT302 Main Board

Replace the GLL852 main board - 1.0X to 2.0X. version

Read from sensor (Backup menu).

Trim the temperature with two temperatures 30°C apart.

This procedure must be done, when the temperature is steady, a temperature standard must be
used as a reference to adjust the DT temperature.

After the temperature trim, make the self-calibration.
Disassembly Procedure
WARNING
Do not disassemble with power on.
Figures 4.3 and 4.4 show transmitter's exploded view and will help you to understand the text below.
The numbers between parentheses are relating to the enumeration of the items of the related
drawing.
Group of the Probe (16A, 16B, 19A or 19B)
To have access to the probe for cleaning, it is necessary to remove it from the process. Remove the
transmitter loosening the against-flange.
Cleaning should be done carefully in order to avoid damaging of the delicate isolating diaphragms.
Use of a soft cloth and a nonacid solution is recommended.
To remove the sensor from the electronic housing, the electrical connections (in the field terminal
side) and the main board connector must be disconnected.
Loosen the hex screw
(6) and carefully unscrew the electronic housing from the sensor, observing
that the flat cable is not excessively twisted.
WARNING
To avoid damage do not rotate the electronic housing more than 270º starting from the fully
threaded without disconnecting the electronic circuit from the sensor and from the power supply.
See Figure 4.1.