Dwyer TDS User Manual
Warranty, Service & Repair
WARRANTY
About this Manual:
PLEASE READ THE ENTIRE MANUAL PRIOR TO
INSTALLING OR USING THIS PRODUCT. This manual
includes information on all models of Dwyer Thermal Dispersion
Flow Switches: TDS series. Please refer to the part number located on the switch label to verify the exact model which you have
purchased.
User’s Responsibility for Safety:
Dwyer manufactures a wide range of flow switches and technologies. While each of these sensors is designed to operate in a wide
variety of applications, it is the user’s responsibility to select a sensor model that is appropriate for the application, install it properly,
perform tests of the installed system, and maintain all components.
The failure to do so could result in property damage or serious
injury.
Proper Installation and Handling:
Because this is an electrically operated device, only properlytrained staff should install and/or repair this product. Use a proper
sealant with all installations. Never overtighten the sensor within
the fitting, beyond a maximum of 80 inch-pounds torque. Always
check for leaks prior to system start-up.
Material Compatibility:
The TDS series sensors are available in two different wetted materials.
Models TDS 1__ are made of Polypropylene (PP) with Ryton tips.
Models TDS 2__ are made of Polyvinylidene Fluoride (PVDF). Make
sure that the model you have selected is compatible with the application
liquid. T o determine the chemical compatibility between the sensor and
its application liquids, refer to an industry reference such as the
Compass Corrosion Guide (available from Compass Publications,
phone 858-589-9636).
Wiring and Electrical:
The supply voltage used to power the sensor should never exceed a
maximum of 36 volts DC. Electrical wiring of the sensor should be
performed in accordance with all applicable national, state, and
local codes.
Flammable, Explosive and Hazardous Applications:
DO NOT USE THE TDS SERIES GENERAL PURPOSE FLOW
SWITCHES IN HAZARDOUS LOCATIONS.
Version 2.0.1A
All rights reserved
Thermal Dispersion
Flow Switch
TDS Series
Owner’s Manual
If for some reason your product must be returned for factory service, contact Dwyer Inc. at (219)879-8000 to receive a Material
Return Authorization number (MRA), providing the following
information:
1. Part Number, Serial Number
2. Name and telephone number of someone who can answer
technical questions related to the product and its application.
3. Return Shipping Address
4. Brief Description of the Symptom
5. Brief Description of the Application
Once you have received a Material Return Authorization number,
ship the product prepaid in its original packing to:
Dwyer Instruments Inc.
PO Box 373
102 Indiana Hwy, 212
Michigan City, IN 46361
Please include the information about the malfunction with your
product. This information enables our service technicians to
process your repair order as quickly as possible.
Step One
WARNING
The rating for the relay is 120 VAC/60 VDC @ 1A. For CE
rated applications, the relay rating is 60 VAC/60 VDC @ 1A.
Dwyer’s Thermal Dispersion flow switches are not recommended for use with electrically charged application liquids.
For most reliable operation, the liquid being measured may
need to be electrically grounded.
I
P
68
Step Two
SPECIFICATIONS
Common Specifications:
175
150
125
100
075
050
025
000
00 20 40 60 80 100
Acceptable
Range
Unacceptable
Range
Temperature/Pressure Derating
Operating Pressure (psi)
Temperature (C¡)
PVDF PP
Thermal Dispersion Ultrasonic Level Switch, LU10 Series
* all dimensions are Nominal
1000
100
10
1
0.1
0.01
.01 .04 .1 .2 1 3 10
6"
4"
3"
2"
1-1/2"
1"
3/4"
1/2"
12" 10" 8"
TDS Series Volume vs Velocity
Flow Rate (gpm)
Velocity (fps)
Set Points:
The TDS liquid flow switch set point is factory calibrated to 0.2
fps. To convert feet/sec to GPM, please refer to the chart
below.
Set point range:
Factory set point:
Repeatability:
Response time:
Set point adjust.:
Viscosity range:
Supply voltage:
Consumption:
Contact type:
Contact rating:
Contact output:
Process temp.:
Electronics temp.:
Pressure:
Sensor rating:
Sensor material:
Cable jacket mat.:
Cable type:
Cable length:
Process mount:
Classification:
CE compliance:
.04 to 3 fps
(.012 to .91 mps)
.2 fps (.06 mps)
±
.5% of set point
1-10 seconds
Potentiometer
1-200 centipoise
12-36 VDC
70 mA maximum
(1) SPST relay
120 VAC/VDC @ 1A
(CE: 60 VAC/VDC @ 1A)
Selectable NO/NC
F: 32˚ to 140˚
C: 0˚ to 60˚
F: -40˚ to 140˚
C: -40˚ to 60˚
150 psi (10 bar) @ 25˚
C., derated @ 1.667
psi (.113 bar) per ˚C.
above 25˚ C.
NEMA 4X (IP65)
TDS1: PP-Ryton®
TDS2: PVDF Kynar®
TDS1: PP
TDS2: PFA Teflon®
4-conductor, #22 AWG
(shielded)
10' (3m)
3/4" NPT
General purpose
EN 50082-2 immunity
EN 55011 emission
EN 61010-1 safety
3/4" NPT3/4" NPT
0.7"
8’ Cable (2.5m)
8’ Cable (2.5m)
4.5"(114mm)
1.3"(32mm)
3.0"(76mm)
2.8"(71mm)
3/4" NPT3/4" NPT
0.7"
(19mm)
2.1"(54mm)
0.7"
(19mm)
(19mm)
TDS Series Flow Switch
TDS _ _ 2
Sensor Material
1 - PP
2 - PVDF
Sensor Length
1 - Short
2 - Long
Maximum T emperature/Volta ge
Derating @ Maximum Current
100
80
60
40
20
00
Ambient Sensor Temperature (C¡)
12 18 24 30 36
Operating Voltage (VDC)
Acceptable
Range
Unacceptable
Range
1,400
Electrical Loading Limits
1,200
1,000
800
600
400
200
0
Max. Series Resistance (Ohms)
Unacceptable
Range
Acceptable
Range
12 18 24 30 36
Supply Voltage (VDC)
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