Endress+Hauser t-switch ATT11 User manual

KA001A/05/e/03.02
t-switch
ATT11
Flow Limit Switch for Liquids and Gases
KA00053D/22/EN/01.11

Contents
Safety Notes 3
Handling 3
Mounting and Installation 4-10
Electrical Connection 11
Operation 12
DIL Switch Explanations 13-14
Quick Set-up Guidelines 15
Set-up Explanation 16
Set-up Procedure:
Set Zero Flow 17
Set Maximum Flow 18
Set Setpoint (AUTO) 19
Set Setpoint (MANUAL) 20
Set Medium Selection 21
Set Relay Mode 21
Diagnostics/Error Codes 22
Technical Data 23-24
Contact Addresses 25-26

Safety Notes
The t-switch ATT11 is designed for flow limit detection in liquids
and gases. The ATT11 should be installed, connected,
commissioned, operated and maintained by qualified and authorised
personnel only, under strict observance of these operating instructions,
any relevant standards, legal requirements and where appropriate,
the certificate. Do not attempt to install or remove the instrument
under pressurised conditions.
Hold by housing or
extension tube; do
not hold by sensor.
Place sensor end
up. Sensor impact
may cause damage.
Handling
3

Mounting and
Installation
Guidelines for Threaded Process Connections
BSP 3/4" (G)
Use appropriately sized sealing
washer.
3/4" NPT
Use a suitable thread tape to achieve
a reliable seal.
Always use a spanner to tighten
the t-switch process connection.
Do not use housing to turn.
Note
For other types of process fittings follow standard good working practices.
4

Mounting and
Installation
Sensor Orientation Markings
Every process connection has an orientation mark stamped on it.
The locations of these marks are shown below and for optimum
performance it is important that it is facing the flow.
5

Mounting and
Installation
Sensor Orientation and
Flow Direction
It is important that the sensor is installed, such that the orientation
mark is positioned upstream to the flowing fluid.
If the sensor is not installed as above it may affect the performance
of the instrument.
Note
Welding instructions are provided with each sensor and care should be taken to read
them prior to installation. 6

5º
5º
Flow
Direction
Mounting and
Installation
Insertion Depth
For optimum measuring performance the active area should be
positioned anywhere between 5% and 50% of the internal pipe diameter.
The sensor tip should be in contact with the medium at all times.
Each form of process connector has an orientation mark that should
or = to sign be positioned in line facing the oncoming flow.
5%
50%
10%
50%
7
For pipe diameters <DN250 For pipe diameters ≥DN250

Mounting and
Installation
Horizontal Pipeline Positioning
Vertical Pipeline Flow Direction
✓
✕Liquid
Gas ✓
✓Liquid
Gas
LIQUID
GAS
LIQUID (Partially Full)
LIQUID
GAS
LIQUID
GAS
LIQUID
GAS
LIQUID (Dirty)
8

>25 dia
>50 dia
>10 dia
Mounting and
Installation
Good installation Practice Summary
9
Avoid installing in areas of extreme flow turbulence. For example;
Directly after bends or expansions/reductions.
Directly downstream of isolation and control
valves especially if partially opened.
Directly after pumps, fans and compressors.
Note
All downstream dimensions provided are to be used as a guideline only and whenever
possible greater dimensions should be considered.
>2 dia
>2 dia
>2 dia