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TD1

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THERMATEL TD1 & TD2 Switches

Flow / Level / Interface Detection

General Description:

The TD1/TD2 Thermatel switch is extremely versatile providing

flow/level/interface detection in a single unit. Both liquid and gas flow

detection is obtainable. The TD1 is available with 24 VDC power with the

TD2 available in either an AC or DC version. The TD2 also provides LED

indication through an optional glass window, mA output for diagnostics or

repeatable flow/level indication, optional hermetically sealed relay, time

delay adjustment, and remote electronics. Continuous diagnostics on both

units provides assurance that the switch is operating properly.

Features:

Continuous diagnostics

Temperature compensation

No moving parts

Narrow hysteresis

Operating temperatures to +850° F (+450° C)

Integral or remote electronics

8-amp DPDT relay with optional hermetically sealed relay

Low flow sensing capabilities

Probes available in 316 stainless steel, Hastelloy® C, and Monel®

Wide selection of sensors – see page 10

NACE construction available

Hygienic design available

Applications:

Flow: Pump protection, relief valve monitoring, low flow/high flow indication,

cooling air/water, exhaust flow, analyzer lines, lubrication systems

Level: High level/low level/interface detection, high viscosity liquids, slurries,

high pressure, high temperature, air/foam and foam/liquid detection,

corrosive environments

APPROVALS

S P E C I F I C AT I O N S

Input Power

TD1: 19.2 to 28.8 VDC

TD2: 100 to 264 VAC, 50–60 Hz or 19.2 to 28.8 VDC

Power Consumption TD1: 3.5 watts at 24 VDC, 4.5 watts at 30 VDC

TD2: 4 watts at 24 VDC, 4.5 watts at 30 VDC, 5 watts at 100 to 264 VAC

Power to Probe

Less than 1 watt

Electronics

TD1: Integral

TD2: Integral or remote

Relay

8-amp DPDT — TD2 has optional hermetically sealed relay

Set Point Range Water: 0.01 to 5 fps (0.003 to 1.5 m/s)

Air: 0.1 to 500 sfps (0.3 to 150 nm/s)

Process Temperature

-100° to +850° F (-73° to +454° C)

Process Pressure

Probe dependent — to 6000 psig (414 bar)

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