Dwyer Instruments SERIES TDS Catalog Page
Series
"B"
"A"
3/4 NPT
Ø1-1/16
[26.99]
Ø45/64
[17.86]
Ø2-13/16
[Ø71.44]
Ø2-13/16
[Ø71.44]
“C”
“B”
“A”
3-5/16
[84.14]
3-29/32
[99.22]
“C”
“B”
“A”
3-5/16
[84.14]
3-29/32
[99.22]
TDS
Thermal Dispersion Flow Switch
Adjustable Switch Point, LED Indication
Dim.
TDS112, TDS212
A
3.0˝ (7.6 cm)
B
0.7˝ (1.8 cm)
Flow Switches,
Thermal
TDS122, TDS222
4.5˝ (11.4 cm)
2.1˝ (5.3 cm)
The Series TDS Thermal Dispersion Flow Switch offers solid state flow detection
of non-coating liquids for pump and process protection. SPDT output allows for interfacing
with remote PLC or relay control device. The adjustable switch point is factory calibrated
at 0.2 fps with LED indication of flow and calibration status. Units feature selectable NO
or NC operation and are not damaged by overranging flow velocities.
Model
TDS112
TDS212
TDS122
TDS222
Wetted Parts
PP/PPS
PVDF
PP/PPS
PVDF
Length
3.0˝ (7.6 cm)
3.0˝ (7.6 cm)
4.5˝ (11.4 cm)
4.5˝ (11.4 cm)
SPECIFICATIONS
Service: Liquids.
Wetted Materials: Polypropylene /PPS
or polyvinylidene fluoride.
Range: 0.04 to 3 fps (1.2X10
m/s).
Temperature Limits: 32 to 140°F (0 to
60°C).
Pressure Limits: 150 psi (10 bar) @
25°C, derated @ 1.667 psi (.113 bar)
per °C above 25°C.
Repeatability: ±5% of setpoint.
Switch Type: SPDT.
Electrical Rating: 60 VAC/60 VDC @
1 A.
-2
to .91
Electrical Connections: 22 AWG 3wire, 10 ft (3 m) length.
Process Connections: 3/4˝ male NPT.
Mounting Orientation: Any
orientation, for pipe sizes 3/4˝ to 1-1/2˝
use 3.0˝ (7.6 cm) length switch; for 2˝
to 16˝ pipe sizes use 4.5˝ (11.4 cm)
length switch.
Setpoint Drift: 0.5% of setpoint.
Response Time: 1-10 seconds.
Viscosity Range: 1 to 200 centipoise.
Supply Voltage: 12 to 36 VDC.
Consumption: 50 mA (nominal).
Indication: LED for flow status.
Weight: 3 oz (94 g).
Agency Approvals: CE.
185
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