Dwyer TTE - Manual (Page 2)

INSTALLATION
1. Location: Select a location where the temperature of the
transmitter will be between 0 and 158°F. Distance from
the receiver is limited only by total loop resistance.
2. Position: The transmitter is not position sensitive. Units
with the optional display should be mounted for ease of
viewing the display.
3. Electrical Connection:
Wire Length - The maximum length of wire connecting
the transmitter and receiver is a function of wire size and
receiver resistance. Wiring should not contribute more
than 10% of the receiver resistance to total loop
resistance. For extremely long runs (over 1000 feet),
choose receivers with lower resistance to minimize the
size and cost of connecting leads.
Current (4-20 mA) Output Operation
An external power supply is required. See Fig. A for diagram
of the connection of the power supply, transmitter and
receiver. The range of appropriate receiver load resistance
(RL) for the DC power supply voltage available is expressed
by the formula:
Shielded cable is recommended for control loop wiring.
Explosion-Proof Installation Notes:
1. Install in accordance with any applicable national electric
code.
2. Plug unused conduit openings. Plug must engage a
minimum of 5 threads.
3. Use a conduit seal within 18 inches of conduit entry.
4. Disconnect power before servicing.
Electrical connections to the RTD Transmitter are made to
the terminal block located inside the housing. Unscrew and
remove the cover. Wire as shown in FIG. B.
Temperature Range Selection
The RTD Transmitter has 7 built in temperature ranges and
a user settable range that are selectable by setting the Dip
Switch located inside the housing (Fig C). Switches 2, 3,
and 4 are used to set the range. To set the desired range,
unscrew and remove the cover and set the Dip Switch
according to the following table:
DIP SWITCH
Selectable Ranges 2 3 4
40 to 90°F (4.4 to 32.2°C) OFF OFF OFF
-20 to 140°F (-28.9 to 60°C) ON OFF OFF
0 to 100°F (-17.8 to 37.8°C) OFF ON OFF
30 to 240°F (-1.1 to 115.6°C) ON ON OFF
32 to 212°F (0 to 100°C) OFF OFF ON
32 to 122°F (0 to 50°C) ON OFF ON
-30 to 65°C (-1.1 to 18.3°C) OFF ON ON
User Settable ON ON ON
E-90-TTE:Model PHO-1 12/22/08 2:04 PM Page 2