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

Mounting and
Installation
Sanitary Sensor Positioning (EHEDG/3A)
Standard Version Extended Version
Sanitary Sensor Mounting Guideline (EHEDG/3A)
DH
DN40 42.7 14.2
DN50 54.8 18.2
✓
✓
✕
✓
It is the responsibility of the user to ensure that the volume enclosed
by the mounting boss has sufficient dimensions to ensure adequate
cleaning takes place. Typically the height should be kept to less than
one third of the diameter of the boss (H ≤1/3D).
For example (in mm)
Guidelines provided relate to the dimensions of the mounting boss
and not the process pipe!
H
D
10

1 2 3 4 5 6 7 8
LCD
OFF
ON
Power
+
1
-
234
MANUAL
AUTO
+
4
3
2
1
PE
(Ground)
Fuse
0.5A
Fuse
0.5A
–
Electrical Connection
Power supply
u: 18-30V AC/DC
Output
Potential-free contact
24V DC @ 0.5A
120V AC @ 0.5A
For AC operation
terminals 1+2 are
not polarity sensitive.
Note
In order to meet EMC requirements, screened or shielded cable is recommended. The screen
or shield should be earthed at the sensor end only.
11
Warning!

Operation
DIL Switches (Dual in Line)
The dual-in-line (DIL) switches are used to configure the following
parameters within the device.
•Zero Flow
•Maximum Flow
•Setpoint
•Medium (liq/gas)
Selection
•Relay Setpoint Mode
LED (Light Emitting Diode)
Illuminated when measured flow above setpoint.
Off when measured flow below setpoint.
Flashes to indicate an error.
LCD (Liquid Crystal Display) – Optional
Used to indicate flow as a percentage of the maximum.
Also displays programming information and status/error codes.
The display is not essential for programming.
1 2 3 4 5 6 7 8
LCD
OFF
ON
ATT11 : t-switch
Power1
+
234
AUTO
MANUAL
Display socket
LED for
Switchpoint/Error
Indication
8 DIL Programming
Switches
12

DIL Switch Explanations
If DIL 8 = AUTO
Then DIL 1-4 are used for AUTOLOAD features. AUTOLOAD is the
means by which actual process flow conditions can be sampled and
stored in memory, as either Zero Flow, Maximum Flow or Setpoint.
Each parameter has a designated DIL switch combination as
described on the following page.
If DIL 8 = MANUAL
Then DIL 1-4 are used to select a setpoint from a table of available
values (%). Each value has a designated DIL switch combination (see
page 19).
•DIL 8 is used to set the operation mode of DIL 1-4.
•DIL 7 is used to configure the relay switching operation.
•DIL 5 and 6 are used to select the medium and its appropriate
calibration curve.
•DIL 1-4 are used to set all parameters related to flow i.e. zero flow,
maximum flow and setpoint.
The operation of DIL 1-4 depends on the position of DIL 8.
13

Displayed
Status Values Description
S 0 0 0 Factory Defaults
S 1 X X Zero Autoloaded
S X 1 X Maximum Autoloaded
S X X 1 Setpoint Autoloaded
DIL 1 DIL 2 DIL 3 DIL 4 Description
OFF OFF OFF OFF Normal Run Mode
OFF-ON-OFF ON OFF OFF Autoload Zero Flow
OFF-ON-OFF OFF ON OFF Autoload Maximum Flow
OFF-ON-OFF OFF OFF ON Autoload Setpoint
OFF-ON-OFF ON ON ON Restore Defaults
ON ON ON OFF View Autoload Status Value
All of the AUTOLOAD features and their corresponding DIL switch
combinations are shown below. (DIL Switch 8 = Auto)
DIL 1 Operation
Toggling of DIL 1 (off-on-off) within 2.5 seconds initiates the relevant
AUTOLOAD functions selected by the positions of DIL 2-4. This
action causes the instrument to sample the process flow signal for
3 seconds and store it in the microprocessor memory.
Restore Defaults
To clear all stored AUTOLOAD values set DIL switch positions to
configuration shown in above table.
Status (display only)
When the DIL switches are set to ‘View Autoload Status’a code will
appear on the display (if fitted). Each digit represents one of the
three AUTOLOAD parameters. ‘0’and ‘1’represent no data stored
and data stored respectively. e.g. S110 –zero and max. stored, but
not setpoint.
DIL Switch Explanations
14

Quick Set-up Guidelines
These instructions are intended to allow a first time user to set up a
flow switch to meet it's basic requirement. Ensure that the device is
fitted with appropriate sensor (flat face = liquid, probe = gas).
AUTOLOAD Zero
This function is used to set the zero-point at operating conditions
with no flow. This operation is crucial to the operation of the device
and must be carried out every time,
a) a new device is installed.
b) the process changes significantly.
c) the sensor is restored to factory defaults.
AUTOLOAD Maximum (Optional)
This function is used to set an actual process flow as the 100% flow
value. This action will,
a) allow the optional display to
indicate a meaningful value (%).
b) assign a meaningful range to the MANUAL setpoints.
Setpoint
There are two alternative methods for selecting the setpoint.
Option 1) AUTOLOAD Setpoint
This function is used to set a setpoint at an actual process flow
anywhere between zero and maximum. Using AUTOLOAD to set the
setpoint provides the best resolution.
Option 2) MANUAL Setpoint
This function is used to set a setpoint at fixed percentage
intervals up to 90% of the maximum flow value. The available values
are shown in the table on page 20. The values in the table refer to
the factory default range or, if the AUTOLOAD max is used, the
users maximum flow range.
15

x
x
Set-up Explanation
There are basically two set-up procedures. They are,
Option 1
Option 2
(2) AUTOLOAD Max Flow
(2) AUTOLOAD Max Flow
(3) AUTOLOAD
Setpoint
(3) Set MANUAL
Setpoint
(Step1) AUTOLOAD Zero
Flow
(Step1) AUTOLOAD Zero Flow
Signal Signal
x
x
16

1) Ensure switch is installed at process operating conditions with
no flow.
2) Set DIL switches as shown.
3) Sample flow signal by toggling DIL 1 (OFF-ON-OFF within
2.5 seconds).
If a display is fitted it will show ZERO for 3 seconds during
sampling or an error message will be displayed.
4) If no further AUTOLOAD functions are required, return DIL
switches to NORMAL RUN MODE as below otherwise proceed to
next AUTOLOAD function.
The LED will change state during sampling, returning to its initial state
at the end of the sampling period. If the LED flashes the AUTOLOAD
has not been accepted (see page 22).
This function is used to set the zero-point and appropriate
operating curve.
Set-up Procedure
Set Zero Flow
(X = Position not relevant)
(X = Position not relevant)
12345678
12345678
17

1) Ensure switch is installed at process conditions with flow running
at maximum.
2) Set DIL switches as below.
3) Sample flow signal by toggling DIL 1 (OFF-ON-OFF within
2.5 seconds).
If a display is fitted and the AUTOLOAD has been successful it will
show FULL for 3 seconds during sampling.
4) If no more AUTOLOAD functions are required return DIL switches
1-4 to NORMAL RUN MODE as below otherwise proceed to next
AUTOLOAD function.
The LED will change state during sampling, returning to its initial
state at the end of the sampling period. If the LED flashes the
AUTOLOAD has not been accepted (see page 22).
12345678
This function is used to set an actual process flow condition as the
100% flow value.
Set-up Procedure
Set Maximum Flow
(X = Position not relevant)
12345678
(X = Position not relevant)
18

1) Ensure switch is installed at process conditions with flow running
at required setpoint.
2) Set DIL switches as below.
3) Sample flow signal by toggling DIL 1 (OFF-ON-OFF within
2.5 seconds).
If a display is fitted and the AUTOLOAD is successful it will show
SON for 3 seconds followed by the value for 3 seconds
during sampling.
4) In order to utilise the AUTOLOADed setpoint return DIL 1-4 to
the NORMAL RUN MODE as below and leave DIL 8 = AUTO.
The LED will change state during sampling, returning at the end of
the sampling period. If the LED flashes the AUTOLOAD has not
been accepted (see page 22).
This function is used to set a setpoint at an actual process flow
anywhere in between the zero and maximum flow settings.
Set-up Procedure
Set Setpoint (AUTO)
(X = Position not relevant)
(X = Position not relevant)
12345678
12345678
19