Thermatel utilizes the proven thermal dispersion tech-nology. There are two elements in the sensor; one heated and one reference. Thermatel detects heat trans-fer which reduces the temperature differe
nce between the sensors. Changes in temperature difference can be due to either a change in media or a change in flow rate.The electronics compare the electrical signal from the sensor against the set point and provide a relay actuation.
Thermatel has demonstrated reliable performance as a flow or level switch. For use as a flow switch, Thermatel can be used to detect either a high flow or a low flow condition for both gases and liquids. For a level switch,Thermatel can be used to detect difference in thermal conductivity of various media. This includes interface detection between media such as liquid/foam, oil/water and even liquid/solid.
Thermatel probes are available in 316L Stainless Steel,Hastelloy C, or Monel with all welded construction. The technology has no moving parts providing excellent reliability.
Twin Tip
Low Flow Body
Spherical Tip
•Fast response to changes in flow or level
•Detect minimum flow or presence/absence or flow •
Suitable for corrosive and harsh environments with all wetted parts of 316L stainless steel, Hastelloy C or Monel. Titanium construction optionally available •Excellent low flow sensitivity
•Suitable for high viscosity and aerated fluids •Hot tap available •Sanitary design available
•NACE construction available (consult factory)•
Process temperatures from -100°F to +392°F (-73°C to +200°C). High temperature version to +850°F (454°C)
•Monitor liquids and gases with the same sensor •
TS model includes electronic self-test and power on delay
D E S C R I P T I O N
T E C H N O L O G Y
retractableF E A T U R E S
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P R O B E Twin Tip
•Corrosive resistant materials •Pressures to 3000 psig
•
Optional 1⁄2" process connection fits directly in 1⁄2" tee.
Spherical Tip
•General purpose service •3-A sanitary design available •
Stainless steel only
Low Flow Body
•
Flow rates of 0.08 gph (8 quarts/day) to 30 gph (0.3to 113.5 liters/hour)•1/4" and 1/2" connections •
Suitable for chemical feed pumps
High Temperature
•Temperatures to +850°F (+454°C)•Pressure to Class 6000 psi •
Includes heat extension
S E L F -T E S T
Thermatel switches offer a unique method of testing the instrument without removing the switch from the pipe or vessel. The self-test may be configured to simulate either a high or low alarm condition. The on-demand electronic test may be accomplished locally or with a remote con-tact closure.
F A C T O R Y  C A L I B R A T I O N Thermatel Flow Switch may be ordered, factory calibrat-ed to alarm at a specified point. Also, a complete set point curve may be obtained from the factory to permit field modification of alarm point. Contact the factory for details.
H O T  T A P
Hot tap retractable probe assemblies for Thermatel probes are available. See bulletin 41-103.
F E A T U R E S
c o n t i n u e d
A P P L I C A T I O N S
Level and Flow switch applications
L E V E L  S W I T C H
Level or Interface can be detected due to differences in thermal conductivity. High or low level alarm applica-tions may be installed either vertically or horizontally.
In the absence of media, the self-heated sensor tip cre-ates a temperature differential between the two sensors.As media contacts the sensing assembly, heat is absorbed by the fluid, decreasing the temperature differential.Probes are available in lengths to 130" (330 cm) for a wide variety of applications.
F L O W  S W I T C H
Flow is detected by an increase in heat transfer that occurs as the flow rate increases. Exceptional low flow sensitivity is obtained with no moving parts. The same unit can be used for both liquid and gas flow indication.
In a low flow condition, the self-heated sensor tip cre-ates a temperature differential between the two sensors.
As flow increases across the sensing assembly, heat is dissipated and temperature differential decreases.
No Flow
Low Level High Level
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A P P L I C A T I O N S
Supply Voltage:
120 VAC, +10%, -15% 50-60 Hz 240 VAC, +10%, -15% 50-60 Hz 24 VDC, ±20%Power Consumption:
5 watts maximum
Output Relay TD Electronics:SPDT with gold flashed contacts, 10 Amp @ 120 VAC, 240 VAC 8 Amp @ 30 VDC, 0.5 Amp @ 125 VDC
Output Relay TS Electronics:
DPDT with gold flashed contacts, 10 Amp @ 120 VAC, 240 VAC 10 Amp @ 28 VDC, 0.5 Amp @ 125 VDC
Hermetically sealed DPDT with gold flashed contacts 5 Amp @ 120 VAC, 240 VAC 5 Amp @ 28 VDC
Operating Temperature Electronics:-40°to +160°F (-40°to +70°C)Operating Temperature:
Sensor:-100°to +392°F (-73°to +200°C) ➀High temperature design:-100°to +850°F (-73°to +454°C)Response Time:
1 to 10 seconds (typical liquid)
Set Point Range—Flow:Water: 0.01 to 5.0 fps (0.003 to 1.5 m/s)Air: 0.1 to 500 fps (0.03 to 150 m/s)Time Delay:0-100 seconds adjustable Repeatability:
<1% @ constant temperature
Probe Materials of Construction
Twin Tip:
All wetted parts of 316L stainless steel, Hastelloy C, or Monel Spherical Tip:316L stainless steel Low Flow Body:316L stainless steel
Process Connection:Refer to part number construction chart on pages 8–11Insertion Length ➁➂
2 inch (5 centimeter) standard
Available in lengths from 3 to130 inches in 1 inch increments,(7 to 330 centimeters in 1 cm increments)1
⁄2"NPT, 1" (2.5 cm) standard
Available insertion lengths from 2 to 60 inches (5 to 152 centimeters)Cable Length 500 feet maximum (152 meters maximum)Shipping Weight
4.6 lbs. (with 2" probe)
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➀Operating temperatures greater than 250°F (120°C) require remote electronics
S E N S O R T I P D E S I G N S
Thermatel offers two sensor tip designs—the original twin tip and the unique spherical tip. Both designs have similar operating ranges.
The sensors in the twin tip are mounted at the end of each tip. In the spherical tip, the sensors are bonded directly to the wall of the tip, providing protection of the sensors.
The spherical tip is recommended for all types of applications—general purpose, high viscosity, and applications where buildup can occur.
Response times for both tips are shown in the chart at right.
Both sensors detect flow or level at approximately the same rate. However, the spherical tip responds faster to a loss of flow or a dry condition.
The actual response time depends upon variables including set point adjustment rate of change in flow, and application specific parameters.Response time: Spherical tip vs. Twin tip
Twin tip Spherical tip
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