Swann AMI Phosphate-II User manual

Operator’s Manual
Firmware V6.20 and higher
AMI Phosphate-II
A-96.250.641 / 290121

© 2020, Swan Analytische Instrumente AG, Switzerland, all rights reserved.
The information contained in this document is subject to change without notice.
Customer Support
Swan and its representatives maintain a fully trained staff of technical specialists around
the world. For any technical question, contact your nearest Swan representative, or the
manufacturer:
Swan Analytische Instrumente AG
Studbachstrasse 13
8340 Hinwil
Switzerland
Internet: www.swan.ch
E-mail: [email protected]
Document status
Title: AMI Phosphate-II Operator’s Manual
ID: A-96.250.641
Revision Issue
00 July 2011 First release
01 March 2012 AMI Phosphate-II B added
02 Jan. 2013 Update to Firmware release 5.30
AMI Phosphate-II B with AMI Sample Sequencer
03 Sep. 2013 Mainboard V2.4, FW update to V5.41
04 April 2017 Mainboard V2.5, FW update to V6.00, removed
AMI Phosphate-II B
05 July 2020 Mainboard V2.6

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AMI Phosphate-II
3
Table of Contents
1. Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1. Warning Notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2. General Safety Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2. Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1. Instrument Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.2. Instrument Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1. Installation Check List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2. Mounting of Instrument Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.3. Connecting Sample and Waste. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.4. Electrical Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.4.1 Connection Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.4.2 Power Supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.5. Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.6. Relay Contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.6.1 Alarm Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.6.2 Relay Contacts 1 and 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.7. Signal Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.7.1 Signal Output 1 and 2 (current outputs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.8. Interface Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.8.1 Signal Output 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.8.2 Profibus, Modbus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.8.3 HART Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.8.4 USB Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4. Instrument Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.1. Establish Sample Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.2. Fill or Flush Reagent System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.3. Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.1. Function of the Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2. Measured Values and Symbols on the Display. . . . . . . . . . . . . . . . . . . . . . . . . 33
5.3. Software Structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.4. Changing Parameters and Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.5 Grab Sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

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6. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.1. Maintenance Schedule. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.2. Stop of Operation for Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.3. Refill or replace Reagents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.4. Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.5. Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.5.1 Prepare the Standard Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.5.2 Start the calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.6. Process Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.6.1 Start the Process Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.7. Cleaning the protective Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.8. Cleaning the Photometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.9. Cleaning the Flow Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.9.1 Disassemble the Flow Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.9.2 Assemble the Flow Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.10. Cleaning the solenoid valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.11. Tube Replacement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.11.1 Changing Pump Tubes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.11.2 Tube Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.12. Longer Stop of Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7. Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.1. Error List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.2. Opening the peristaltic pump housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
7.3. Replacing Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8. Program Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
8.1. Messages (Main Menu 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
8.2. Diagnostics (Main Menu 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.3. Maintenance (Main Menu 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
8.4. Operation (Main Menu 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8.5. Installation (Main Menu 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
9. Program List and Explanations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
1 Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
2 Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
3 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
10. Material Safety Data sheets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
10.1. Reagents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

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11. Default Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
12. Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
13. Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

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Safety Instructions
6
AMI Phosphate-II–Operator’s Manual
This document describes the main steps for instrument setup, opera-
tion and maintenance.
1. Safety Instructions
General The instructions included in this section explain the potential risks
associated with instrument operation and provide important safety
practices designed to minimize these risks.
If you carefully follow the information contained in this section, you
can protect yourself from hazards and create a safer work environ-
ment.
More safety instructions are given throughout this manual, at the re-
spective locations where observation is most important. Strictly fol-
low all safety instructions in this publication.
Target
audience
Operator: Qualified person who uses the equipment for its intended
purpose.
Instrument operation requires thorough knowledge of applications,
instrument functions and software program as well as all applicable
safety rules and regulations.
OM Location Keep the AMI Operator’s Manual in proximity of the instrument.
Qualification,
Training
To be qualified for instrument installation and operation, you must:
read and understand the instructions in this manual as well as
the Material Safety Data Sheets.
know the relevant safety rules and regulations.

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AMI Phosphate-II
Safety Instructions
7
1.1. Warning Notices
The symbols used for safety-related notices have the following
meaning:
DANGER
Your life or physical wellbeing are in serious danger if such warn-
ings are ignored.
Follow the prevention instructions carefully.
WARNING
Severe injuries or damage to the equipment can occur if such
warnings are ignored.
Follow the prevention instructions carefully.
CAUTION
Damage to the equipment, minor injury, malfunctions or incorrect
process values can be the consequence if such warnings are ig-
nored.
Follow the prevention instructions carefully.
Mandatory
Signs
The mandatory signs in this manual have the following meaning:
Safety goggles
Safety gloves

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Safety Instructions
8
Warning Signs The warning signs in this manual have the following meaning:
Electrical shock hazard
Corrosive
Harmful to health
Flammable
Warning general
Attention general

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Safety Instructions
9
1.2. General Safety Regulations
Legal
Requirements
The user is responsible for proper system operation. All precautions
must be followed to ensure safe operation of the instrument.
Spare Parts
and
Disposables
Use only official SWAN spare parts and disposables. If other parts
are used during the normal warranty period, the manufacturer’s war-
ranty is voided.
Modifications Modifications and instrument upgrades shall only be carried out by
an authorized Service Technician. SWAN will not accept responsibili-
ty for any claim resulting from unauthorized modification or alter-
ation.
WARNING
Electrical Shock Hazard
If proper operation is no longer possible, the instrument must be
disconnected from all power lines, and measures must be taken
to prevent inadvertent operation.
To prevent from electrical shock, always make sure that the
ground wire is connected.
Service shall be performed by authorized personnel only.
Whenever electronic service is required, disconnect instrument
power and power of devices connected to.
– relay 1,
– relay 2,
– alarm relay
WARNING
For safe instrument installation and operation you must read and
understand the instructions in this manual.
WARNING
Only SWAN trained and authorized personnel shall perform the
tasks described in this document.

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AMI Phosphate-II
Product Description
10
2. Product Description
Application The AMI Phosphate-II is a complete monitoring system for the auto-
matic continuous measurement of ortho-Phosphate. ortho-Phos-
phate can be found in many applications like corrosion protection in
sanitary systems and boilers or as additive to detergents.
The AMI Phosphate-II is used in quality control of drinking water and
waste water plants.
Measuring
principle
The measurement is based on the molybdenum blue colorimetric
method according to APHA 4500-P E. and on EN ISO 6878. When
the reaction product of o-phosphate with ammonium-molybdate is
reduced with ascorbic acid, the intensely colored molybdenum blue
is formed. The color intensity is proportional to the o-phosphate con-
centration of the sample and is measured photometrically at 815 nm.
Programmable
Measuring
Intervals
The duration of a measuring interval can be set to:
10 min
15 min
20 min
30 min
Independent of the programmed measuring interval, the measure-
ment time of a sample takes 7 minutes.
Signal
Outputs
Two signal outputs programmable for measured values (freely scal-
able, linear or bilinear) or as continuous control output (control pa-
rameters programmable).
Current loop: 0/4–20 mA
Maximal burden: 510 Ω
Third signal output available as an option. The third signal output can
be operated as a current source or as a current sink (selectable via
switch).
Relay Two potential-free contact programmable as limit switches for mea-
suring values, controllers or timer for system cleaning with automatic
hold function. Both contacts can be used as normally open or nor-
mally closed.
Maximum load: 1 A/250 VAC

A-96.250.641 / 290121
AMI Phosphate-II
Product Description
11
Alarm Relay One potential free contact. Alternatively:
Open during normal operation, closed on error and loss of
power.
Closed during normal operation, open on error and loss of
power.
Summary alarm indication for programmable alarm values and in-
strument faults.
Input One potential-free contact to freeze the measuring value or to inter-
rupt control in automated installations (hold function or remote-off).
Safety
Features
No data loss after power failure. All data is saved in non-volatile
memory. Over voltage protection of in- and outputs.Galvanic separa-
tion of measuring inputs and signal outputs.
Communica-
tion interface
(optional)
USB Interface for logger download.
Third signal output (can be used in parallel to the USB interface)
RS485 with Fieldbus protocol Modbus or Profibus DP
HART interface
Cleaning
Module
An optional cleaning module is available that can be connected to
the AMI Phosphate-II.
On-line
operation
The sample flows through the sample inlet [F] and the filter vessel
[G] into the constant head [A]. Adjust the flow regulating valve [D] so
that always a small part of the sample flows through the overflow
tube [B] into the constant head drain [H]. This adjustment ensures a
sufficient sample flow through the measuring chamber of the pho-
tometer [M].
If no measurement takes place, the sample flows through the outlet
of the photometer where it will be aerated through air inlet [P] to gen-
erate bubbles. Then the sample flows through the bubble counter [L]
into the photometer drain [I].
If a measuring cycle starts:
1A zero measurement with the sample is performed before the re-
agents are added.
2The peristaltic pump [O] pumps the reagents [J] and [K] into the
mixing chamber [E] where they are mixed together with the sam-
ple and then flowing through the photometer [M].
3The solenoid valve [N] will be activated to close the inlet of the
photometer.
4The sample remains in the photometer for 7 minutes. During this
time a reaction with the reagents takes place.

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Product Description
12
5After the 7 min have elapsed a second measurement is carried
out and the o-phosphate concentration is calculated.
6If the measurement has been finished, the solenoid valve will be
deactivated to open the inlet of the photometer.
7The sample flows through the outlet of the photometer where it
will be aerated to generate bubbles.
8The sample flows through the bubble detector [L] and into the
photometer drain [I].
Fluidics
A
B
C
D
E
F
G
H
Constant head
Overflow tube
Sample flow to mixing
chamber
Flow regulating valve
Mixing chamber
Sample inlet
Filter vessel
Constant head drain
I
J
K
L
M
N
O
P
Photometer drain
Oxycon on-line Phosphate 1
Oxycon on-line Phosphate 2
Bubble detector
Photometer
Solenoid valve
Peristaltic pump
Air inlet
Level
D
B
A
C
F
G
H
I
J
K
L
M
O
P
E
N

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Product Description
13
2.1. Instrument Specification
CAUTION
Impairment of measurement accuracy
The accuracy of the instrument may be impaired by contamina-
tion of the sample.
make sure that the sample does not contain any oil, grease or
sand.
Power Supply AC variant:
DC variant
Power consumption:
100–240 VAC (± 10%)
50/60 Hz (± 5%)
10–36 VDC
max. 35 VA
Transmitter
specifications
Housing:
Ambient temperature:
Storage and transport:
Humidity:
Display:
aluminum, with a protection degree of
IP 66 / NEMA 4X
−10 to +50 °C
−30 to +85 °C
10–90% rel., non condensing
backlit LCD, 75 x 45 mm
Sample
requirements
Flow rate:
Sample pressure inlet:
Temperature:
min. 10 l/h
0.15–2 bar (2–28 PSI)
up to 50 °C (122 °F)
On-site The analyzer site must permit connections to:
requirements Sample inlet:
Sample outlet:
Tube 6 x 8 mm
2 Drains, 1/2” hose nozzle for flexible
tube diam. 20x15 mm which must end in
convenient atmospheric waste of suffi-
cient capacity.

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AMI Phosphate-II
Product Description
14
Dimensions Panel:
Dimensions:
Screws:
Weight:
PVC
400x850x200 mm
5 mm or 6 mm diam.
9.5 kg /20.9 lbs
Exit Enter
AMI Phosphate-II
30 mm / 1.18"
13 mm / 0.51"
6 x dia. 6.5 mm / 0.26"
412 mm / 16.22" 850 mm / 33.46" 824 mm / 32.44"
374 mm / 14.72"
400 mm / 15.75"

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Product Description
15
2.2. Instrument Overview
A
B
C
D
E
F
G
Panel PVC
Transmitter
Constant head
Air inlet pipe
Flow cell block
Sample inlet with filter vessel
Solenoid valve
H
I
J
K
L
M
N
Photometer
Bubble detector
Waste funnel for sample
Drain
Oxycon on-line Phosphate 1
Oxycon on-line Phosphate 2
Peristaltic pump
A
B
C
D
E
N
M
LK
J
I
H
G
F

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AMI Phosphate-II
Installation
16
3. Installation
3.1. Installation Check List
On site require-
ments
AC variant: 100–240 VAC ( 10%), 50/60 Hz ( 5%)
DC variant: 10–36 VDC
Power consumption: 35 VA maximum.
Protective earth connection required.
Sample line with sufficient sample flow and pressure (see Instru-
ment Specification, p. 13).
Installation Mount the instrument in vertical position.
Display should be at eye-level.
Mount the filter, filter vessel, and constant head.
Connect the sample and waste line. See Connecting Sample and
Waste, p. 18
Electrical Wiring Connect all external devices like limit switches, current loops and
pumps.
Connect power cord; do NOT switch on power yet!
See Electrical Connections, p. 19
Reagents Prepare reagents. See Refill or replace Reagents, p. 38
Power-up – Lock the occlusion frames of the peristaltic pump.
 The peristaltic pump is ready
– Turn on the sample flow and wait until the flow cell is completely
filled.
– Switch on power.
– Start “Fill System”. See Fill or Flush Reagent System, p. 31
Instrument
Setup
– Program all parameters for external devices (interface, recorders,
etc.).
– Program all parameters for instrument operation
– limits
– alarms
– measuring interval
Run-in period Let the instrument run continuously for 1 h.

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Installation
17
3.2. Mounting of Instrument Panel
The first part of this chapter describes the preparing and placing of
the system for use.
The instrument must only be installed by trained personnel.
Mount the instrument in vertical position.
For ease of operation mount it so that the display is at eye
level.
For the installation a kit containing the following installation ma-
terial is available:
– 6 Screws 6x60 mm
– 6 Dowels
– 6 Washers 6.4/12 mm
For dimensions see picture 14.
Mounting
requirements
The instrument is only intended for indoor installation.

A-96.250.641 / 290121
AMI Phosphate-II
Installation
18
3.3. Connecting Sample and Waste
Sample inlet Use plastic tube (FEP, PA, or PE 4 x 6 mm) to connect the sample
line.
Mounting of
SERTO fitting
Waste Connect the 1/2” tubes to the nozzle of the waste funnels and place
them into an atmospheric drain of sufficient capacity.
WARNING
Health hazard
The sample in the photometer contains sulfuric acid.
At no means recirculate it into the water system.
A
B
C
D
Screw connection
Compression ferrule
Knurled nut
Flexible tube
B
C
D
A
A
B
C
D
Tube from photometer
Waste (photometer)
Tube from constant head
Drain (constant head)
A
B
C
D

A-96.250.641 / 290121
AMI Phosphate-II
Installation
19
3.4. Electrical Connections
WARNING
Risk of electrical shock.
Do not perform any work on electrical components if the transmit-
ter is switched on. Failure to follow safety instructions could result
in serious injury or death.
Always turn off power before manipulating electric parts.
Grounding requirements: Only operate the instrument from an
power outlet which has a ground connection.
Make sure the power specification of the instrument corre-
sponds to the power on site.
Cable
thicknesses
In order to comply with IP66, use the following cable thicknesses
Note: Protect unused cable glands
Wire For Power and Relays: Use max. 1.5 mm2 / AWG 14 stranded
wire with end sleeves.
For Signal Outputs and Input: Use 0.25 mm2 / AWG 23
stranded wire with end sleeves.
A
B
C
PG 11 cable gland: cable Øouter 5–10 mm
PG 7 cable gland: cable Øouter 3–6.5 mm
PG 9 cable gland: cable Øouter 4–8 mm
ABC

A-96.250.641 / 290121
AMI Phosphate-II
Installation
20
WARNING
External Voltage.
External supplied devices connected to relay 1 or 2 or to the
alarm relay can cause electrical shocks
Make sure that the devices connected to the following contacts
are disconnected from the power before resuming installation.
– relay 1
– relay 2
– alarm relay
WARNING
To prevent from electrical shock, do not connect the instrument to
the power unless the ground wire (PE) is connected.
Do not connect unless specifically instructed to do so.
WARNING
The mains of the AMI Transmitter must be secured by a main
switch and appropriate fuse or circuit breaker.