Dwyer 3200G - Manual (Page 18)

6.4 Hardware Maintenance
The Mercoid
® 3200 Smart Transmitter has no moving parts and
requires little maintenance. If a transmitter fails, it must be retuned to
Dwyer Instruments, Inc. for inspection, repair, or replacement.
6.4.1 Test Terminals
The test terminals are marked TEST on the terminal block. The
test and negative terminals are connected to the power terminals;
so long as the voltage across the receptacles are below the diode
threshold voltage, no current will pass through the diode. To
ensure that current isn’t leaking through the diode, test the reading
with an indicating meter. The test connection should not exceed
10 ohms. A resistance value of 30 ohms will cause an
approximate 10 percent of reading error.
6.4.2 Disassembling the Electronics Housing
The transmitter is designed with dual-compartment housing; one
contains the electronics module, and the other contains all wiring
terminals and the communication terminals.
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Figure 6-1 Test Terminals
Figure 6-2 Structure of Housing
Galvanometer