t-switch
Technical Information
TI014A/05/e/03.01
t-switch
Flow switch for liquid
and gas
Product Structure ATT11-
Endress+Hauser
GmbH+Co
Instruments International
Colmarer Str 6
D-79576 Weil am Rhein
Germany
Tel:+49 (7621) 97 5 02
Fax: +49 (7621) 97 53 45
www.ii.endress.com
Endress+Hauser Ltd.
Floats Road
Manchester M23 9NF
United Kingdom
Tel: 0161 286 5000
Fax: 0161 998 1841
www.uk.endress.com
Technical Information
TI014A/05/e/03.01
Approvals
A For use in non-hazardous areas
B FM General Approval (pending)
C CSA General Approval (pending)
Y Special – please specify
Sensor Form
11 Flat face sensor
12 Flat face sensor, insertion 125mm
13 Flat face sensor, insertion 235mm
21 Probe sensor
22 Probe sensor, insertion 125mm
23 Probe sensor, insertion 235mm
99 Special – please specify
Process Connection
(Material 1.4435/316L unless stated)
D1 G
3
/
4
" BSP, (Boss Included)
D2 G
3
/
4
" BSP, Brass (Boss Included)
Brass compression fitting for insertion
sensor only
F1 NPT
3
/
4
" (Boss Included)
F2 NPT
3
/
4
", Brass (Boss Included)
Brass compression fitting for insertion
sensor only
J1 DN40 Dairy coupling DIN 11851
K1 DN50 Dairy coupling DIN 11851
L1 Varivent >=DN50
M1 Tri Clamp 1
1
/
2
" ISO2852
N1 Tri Clamp 2" ISO2852
P1 DN50 Aseptic coupling DIN 11864-1
Y9 Special – please specify
Surface Finish, Wetted Parts
1 Standard Metal Finish
2 Ra<1.5 µm/120 grit
3 Ra<0.8 µm/150 grit (3A/EHEDG)
5 Ra<1.5 µm/120 grit, O2duty
6 Ra<0.8 µm/150 grit, O2duty (3A/EHEDG)
7 Standard Metal Finish, O2duty
9 Special – please specify
Electronics & Outputs
A Relay Output, No Display, power supply –
18-30V DC/AC (50/60Hz)
B Relay Output, 4 digit LCD, power supply –
18-30V DC/AC (50/60Hz)
St. St. Housing only
Y Special – please specify
Housing & Cable Entry
4D Polyester Housing IP66 M20 Gland
4H Polyester Housing NEMA4X NPT
1
/
2
" entry
6D SS304 Housing IP66 M20 Gland
6H SS304 Housing NEMA4X NPT
1
/
2
" entry
9Y Special – please specify
Documentation
1 Standard Documentation
2 EN10204-2.3 Pressure test
1.5 x pressure rating for 3 minutes
9 Special – please specify
ATT11- Order Code
United Kingdom All Other Countries
Performance and Selection
t-switch
Endress+Hauser 2
t-switch
Endress+Hauser1
Measuring Principle
Sensor Type
Liquid (flat face)
Figures referenced to water
Ranged 0-1.5m/sec (provisional)
Time Response: 5 sec rising
< 5 sec falling
(0-66% step change)
Gas (probe)
Figures referenced to Air
Ranged 0-30m/sec (provisional)
Time Response: 15 sec rising
10 sec falling
(0-66% step change)
Extended versions available with alternative
process connections.
Thermal technology is a well established operating principle in the process industry used on a
wide variety of applications. It operates by monitoring the cooling effect of a fluid stream as it
passes over a heated transducer (RTD). The fluid flows over two RTD elements one of which
senses the actual fluid temperature and provides a reference whilst the other is heated to ensure a
constant differential temperature above the fluid temperature. The applied power needed to
maintain this differential is proportional to the mass flow of the fluid.
Planning and Installation
Guidelines
LIQUID
GAS
LIQUID
GAS
LIQUID (Partially Full)
LIQUID
GAS
LIQUID
GAS
LIQUID
GAS
LIQUID
GAS
LIQUID (Dirty)
52
29.5
Performance and Selection
Process Plant
Features and Benefits
Chemical Industry
• Single device for liquids and gas
• Wide dynamic rangeability
• No moving parts – reduced maintenance
• Simple and reliable to install and programme
• Wide selection of process connections
• Incorporates fuzzy logic control algorithm allowing manual adjustment of meter sensitivity to suit
application requirements
• Dry run protection for pumps
• Control of cooling systems for pumps, turbines, compressors and heat exchangers
Water Treatment
Beverage Industry
• Status indication of valves in water distribution systems
• Chemical dosing
• Air injection
• Filter control
• Monitoring cleaning processes
Dairy Industry
• Cooling systems in refrigeration plants
• Chemical dosing
• Monitoring pump function
Applications
• Mount upstream of control valves, hand or isolation valves
• Ensure sensor is aligned with direction of flow (see manual)
• For liquids ensure full pipes
• Avoid areas of cavitation (liquids)
• For gases avoid areas where condensate collects
• Avoid applications with large process temperature changes
• Avoid mounting device where exposure to extreme ambient temperature changes occurs e.g.
direct sunlight
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