TD1-2D00-031 Datasheet, PDF (1/16 Pages) Magnetrol International, Inc. – Thermal Dispersion Flow/Level/Interface Switch

Thermatel^® Model TD1/TD2
Thermal Dispersion
Flow/Level/Interface Switch
DESCRIPTION
TD1 and TD2 Thermal Dispersion flow/level/interface
switches provide a new level of performance and
reliability not found in previous switches. Continuous
diagnostics with fault indication, temperature compen-
sation, narrow hysteresis and fast response time make
the TD1/TD2 the latest in thermal dispersion switch
technology.
TD1 is a basic switch with 24 VDC power and an 8-amp
DPDT relay. The TD2 adds LED indication through a
glass window, ability to electrically measure the set
point, mA output for diagnostics and trending, optional
hermetically sealed relay, plus time delay. A universal
AC power supply simplifies installation.
Thermatel^® probes are available in 316 Stainless Steel,
Hastelloy^® C, or Monel^® with all welded construction.
FEATURES
Model TD2
with spherical probe
Model TD1
with twin-tip probe
Model TD2
with low flow body
Model TD2
with hygienic stainless steel enclosure
& spherical tip probe
TECHNOLOGY
• Temperature compensated to provide repeatable
alarm under varying process temperatures
• Continuous diagnostics detect sensor fault
• Non-linear mA output signal can be used for trend-
ing, diagnostics and repeatable flow/level indication
(TD2)
• Detects minimum flow or presence/absence of flow
• Easy/fast calibration
• Excellent low flow sensitivity
• Optional hot tap available (see bulletin 41-103)
• Hygienic design available
• NACE construction available (consult factory)
• Process temperatures from -100° to +400° F (-73° to
+204° C)—High temp. version to +850° F (+454° C)
The Thermatel^® TD1 and TD2 switches utilize the
Magnetrol^® proven thermal dispersion technology. The
sensor consists of two RTD elements. One is the refer-
ence and the second is heated to a temperature above
the process temperature. The electronics detect the
temperature difference between the two elements. The
temperature difference is greatest in air, then decreases
when cooling occurs due to a change in media. An
increase in the flow rate further decreases the tempera-
ture difference.
The set point is adjusted for the switch to alarm at the
desired temperature difference. Once the set point is
reached, the relay will change state.