Dwyer TTE User Manual

Bulletin E-90-TTE

Series TTE Explosion-Proof RTD Temperature Transmitter

Installation and Operation Instructions

4-9/32

[108.74]

10-23/64
[263.13]

[113.51]

1/2 NPT

4-15/32

2-23/32
[69.06]

The Series TTE Explosion-Proof RTD Temperature
Transmitter is the ideal product for hazardous

temperature measurement applications. The TTE series has
seven pre-programmed temperature ranges that are
selectable via an internal dip switch. For those applications
that need a custom range, the transmitter can be easily
configured for any range between -30 to 250°F with a
minimum span of 40°F. The span and zero can be quickly
adjusted with a simple push button design. The compact
housing allows for the transmitter to be mounted in virtually
any application.

The Series TTE is ideally suited for refrigeration, building
automation, commercial hot water heaters and boilers, and
water chillers applications.

3-29/32
[99.22]

1/2 NPT

1/2 NPT

ø1/4

[ø6.35]

SPECIFICATIONS
Temperature Sensor: Pt1000, 0.00385 DIN.
Output Temperature Ranges: User selectable – any range

between –30 to 250°F with a minimum span of 40°F.
Temperature Limits: Ambient: 0 – 158°F (-18 to 70°C).
Process: -30 to 250°F (-34.4 to 121.1°C).

Accuracy: Transmitter +/0.1% F.S. Probe +/-0.3% F.S.
Thermal Drift Effects: +/-0.02%/°C max.
Response Time: 250 ms.
Wetted Materials: 316 stainless steel.
Process Connection: 1/2˝ male NPT.
Conduit Connection: 1/2˝ female NPT.
Probe Length: 2˝ to 18˝ (depending on model).
Pressure Limits: 2000 PSI.
Power Requirements: 10 to 35 VDC.
Output Signal: 4-20 mA (two wire loop powered).
Optional Display: 2 lines X 8 character LCD.
Enclosure Rating: NEMA 4X (IP66) and explosion-proof

for Class I, Groups B, C, D; Class II, Groups E, F, G; Class
III.

Weight: 2 lb 8 oz (1134 g).
Agency Approvals:FM, CE.

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

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.

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

Electrical connections to the RTD Transmitter are made to
the terminal block located inside the housing. Unscrew and
remove the cover. W ire as shown in FIG. B.