AquaMetrix AM-LDO Operating Manual
AM-LDO Manual, Rev. 1.1
AquaMetrix AM-LDO
Dissolved Oxygen Sensor
Installation and Operation Guide
AM-LDO Manual, Rev. 1.1
1 Introduction
The AM-LDO is one of the most compact, durable and easiest to use dissolved oxygen sensors on the
market. It is made for AquaMetrix by Hamilton, a manufacturer with a long history of making premium
sensors for the highly demanding medical field.
The AM-LDO is an optically based sensor. It emits a pulse of light that is absorbed by a rare metal
compound. The compound re-emits light at a longer wavelength pulse of light (i.e. fluorescence) that
is measured by a photo-detector in the sensor. The intensity and lifetime of the emitted pulse
depends on the oxygen concentration (whether in air or water). A high concentration oxygen shortens
the lifetime and decreases the intensity of the emitted light. The sensor’s firmware measures the
amount of this so-called “quenching” of the fluorescence and calculates the oxygen concentration.
The AM-LDO provides two electrical interfaces: standard analog (4–20 mA) and digital Modbus RTU
over RS485. These are built into each sensor and are supported directly from the sensor head. The
analog 4–20 mA and digital RS485 interfaces do not require any additional equipment such as
amplifier or transmitter. The AM-LDO sensor also contains a temperature sensor (NTC 22 kΩ). This
temperature sensor is only used for the compensation of temperature of the oxygen signal when it’s
in analog 4-20 mA mode
The AM-LDO is a stand-out from amongst optically based DO sensors for several reasons:
1. All electronics and firmware are housed in the compact sensor body.
2. The sensor’s luminescent cap lasts an industry-leading 3 years or longer before needing
replacement.
3. The sensor outputs both an analog 4-20 mA signal and digital Modbus signal.
4. The sensor comes ready to operate out of the box as an analog sensor without any
configuration or calibration via the digital interface.
5. For making configuration or calibration changes all you need is the free HDM software, a USBto-RS485 adapter and a PC.
The main application for the AM-LDO sensor is the in-line measurement of DO in clean and waste
water. The main characteristic that makes the AM-LDO sensor ideal for his application is its remarkable
long-term stability, even after prolonged use in wastewater.
The AM-LDO typically connects to either a PLC or to the AquaMetrix 2300 controller. This manual is
meant to get you started in the shortest amount of time. There are many advanced features that you
may never need and that this manual will not cover in detail.
This manual is not an exhaustive overview of all of the features of the AM-LDO. The HDM software has
an excellent online guide that is searchable by topic. This manual is designed to get you “up and
running” in the least amount of time and to explain the features you are most likely to use.
AM-LDO Manual, Rev. 1.1
Table&of&Contents&
1! Introduction ......................................................................................................................................................................... 2!
3! Specifications ....................................................................................................................................................................... 5!
4! Installation ............................................................................................................................................................................ 6!
4.1! Safety Precautions ..................................................................................................................................................... 6!
4.2! Sensor Installation ..................................................................................................................................................... 6!
4.2.1! Identification ....................................................................................................................................................... 6!
4.2.2! Electrical Connections ..................................................................................................................................... 7!
5! Software Installation ......................................................................................................................................................... 7!
5.1! Downloading the HDM Software ......................................................................................................................... 7!
5.2! Installing the PN24211-02 USB-RS485 Converter Driver Software .......................................................... 8!
5.3! Installing the Hamilton Arc Sensor DTM Setup Software ........................................................................ 10!
5.4! Installing the Hamilton Device Manager Setup Software ........................................................................ 10!
5.5! The HDM Device Manager ................................................................................................................................... 11!
5.6! Setting up the HDM Device Manager and Sensor ...................................................................................... 11!
5.7! The Device Manager Menu Bar .......................................................................................................................... 15!
5.7.1! File Menu ........................................................................................................................................................... 15!
5.7.2! Device ................................................................................................................................................................. 15!
5.7.3! View Menu ........................................................................................................................................................ 15!
5.7.4! Tools .................................................................................................................................................................... 15!
5.8! Configuring the Device Manager ...................................................................................................................... 16!
5.8.1! Measurement: .................................................................................................................................................. 16!
5.8.2! Calibration ......................................................................................................................................................... 16!
5.8.3! Status .................................................................................................................................................................. 17!
5.8.4! Interface ............................................................................................................................................................. 17!
5.8.5! Information ....................................................................................................................................................... 17!
5.8.6! System ................................................................................................................................................................ 17!
6! Multiplexing Multiple Sensors .................................................................................................................................... 18!
7! Calibration and Maintenance ..................................................................................................................................... 18!
7.1! Warm-up .................................................................................................................................................................... 18!
7.2! Calibration ................................................................................................................................................................. 19!
7.2.1! Automatic Standard Calibration ............................................................................................................... 19!
7.2.2! Product Calibration ........................................................................................................................................ 19!
AM-LDO Manual, Rev. 1.1
7.3! Changing the Sensor Cap .................................................................................................................................... 20!
8! Errors and Warnings ....................................................................................................................................................... 20!
9! Products and Accessories ............................................................................................................................................. 21!
AM-LDO Manual, Rev. 1.1
3 Specifications
POWER
Power Supply
7 to 30 VDC, Maximum 1 W, 0.6 W continuous
GENERAL
Functionality
Measurement, self-diagnosis, analog and digital output
Measurement Principle
Oxygen quenching of luminescence
Temperature Range
-10 to 85 0C
Pressure Range
0 to 12 bar (174 psi)
Measurement Range
0.05 to 300% air saturation
Measurement Units
%-saturation, %-volume, mg/l or ppm.
0C
.
Response Time
98% of measurement in <30 seconds @ 250C
Detection Limit
0.01 %-volume
Drift
Lower than 0.2%-volume oxygen per week in air at 300C
Cross sensitivities
Not sensitive to carbon dioxide, hydrogen sulfide, sulfur dioxide or ethylene oxide
Resistances
Resistant to ethanol, methanol, hydrogen peroxide. Not resistant to chlorine and
organic solvents
Output
Analog Output
ECS (Electrochemical Simulation) Mode or 4-20 mA for DO or temperature
Digital Output
Modbus RTU over RS 485. Maximum 31 addresses
ENVIRONMENT
Temperature Range
-40˚F to +185˚F (-40˚C to +85˚C), process and storage areas
Pressure
7 psi (0.5 bar)
PHYSICAL
Wetted Materials
316 stainless steel
Replaceable Parts
Sensor cap with luminescent coating
Dimensions
12 mm diameter x 120 mm length
Mechanical Connector
PG 13.5 male connector
Electrical Connector
VP8 socket head
Weight
Ingress Protection
NEMA 4X (IP66 to EN 60529)
AM-LDO Manual, Rev. 1.1
4 Installation
4.1 Safety Precautions
The AM-LDO sensor must be used for its intended application, and in optimum safety and operational
conditions. The specifications (such as temperature or pressure) defined in Section Error! Reference
source not found. (Technical Specifications) and must not be exceeded under any circumstances.
Potential hazards can exist if the sensor is not operated correctly or appropriately.
Only trained personnel should perform assembly and maintenance. Make sure that the PG 13.5 thread Only trained personnel should perform assembly and maintenance. Make sure that the PG 13.5 thread
and the O-ring are not damaged when screwing the sensor into the process. O-rings are consumable
parts, which must be exchanged regularly (at least once per year).
Before removing the sensor from its measurement setup, always make sure that no process medium
can be accidentally spilled.
The built-in temperature sensor can only be used for temperature correction, not for controlling the
process temperature.
4.2 Sensor Installation
The AM-LDO has a PG13.5 compression fitting for mounting in a vessel or pipe. AquaMetrix sells a
stainless steel adapter that converts this ISO standard male fitting into a more common 1” MNPT
fitting.
4.2.1 Identification
The AM-LDO is a Hamilton sensor that comes with an integrated orange cable. Other Hamilton sensors
come with the sensor and cable as separate. The manual for this product is the Visiferm DO Arc
Manual. It is currently located at http://hamiltoncompany.com/products/sensors/c/875/. Please note
that the color-coding of the conductors is different than that of AM-LDO. The wires of the AMLDO are color coded as shown in Table 1. The third column provides the corresponding pin ID label for
the Visiferm DO Arc.
Table 1 - Color code for sensor conductors. The corresponding pin assignments for the Hamilton Visiferm
with separate cable and sensor are in the third column.
Color
AM-LDO Connection
Corresponding
Pin on Visiwater
Yellow
Not connected
A
Green
4-20 mA out
B
Red
+ 24 VDC
C
Blue
Ground
D
Brown
Not connected
E
AM-LDO Manual, Rev. 1.1
White
Not connected
F
Gray
RS485 A
G
Pink
RS485 B
H
Shield
Ground to housing
n/a
In normal operation only the red, green and blue wires that carry the 4-20 mA signal and power will be
used. When connecting the sensor to a PC the gray and pink conductors carry the Modbus signal.
4.2.2 Electrical Connections
The AM-LDO is a 4-20 mA 3-wire sensor. It is powered by an external 24 VDC power supply. Figure 1
shows the connections between a power supply, the AM-LDO and the AquaMetrix 2300 controller.
The connections to the 2300 are the same as those to any PLC. Note that connections differ from a
traditional 3-wire sensor
Figure 1 - Electrical Connections to the AM-LDO. The 3-wire probe is powered by a 24 VDC power supply.
The connections are shown for the AquaMetrix 2300 but are the same for any PLC.
5 Software Installation
5.1 Downloading the HDM Software
The AM-LDO communicates to a Windows computer using the FDT/DTM framework. This open
environment allows different devices using different protocols (Modbus, Profibus, DeviceNet, etc.) to
communicate through a Windows based PC using one Field Device Tool (FDT) frame. Each device has
its Device Type Manager (DTM).
GND
+24 V
Power Supply
AM-LDO Probe
Green Wire
Red Wire
Blue Wire
24V 24V An1 An4An3An2 Gnd
Analog Connector on the 2300
Signal
24 VDC
Ground
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