Purafil ONGUARD SMART User manual

2654 Weaver Way | Doraville, GA 30340 | Office: 770.662.8545 | www.purafil.com | OnGuard Smart Manual - 01
USER MANUAL
ONGUARD®SMART

2654 Weaver Way | Doraville, GA 30340 | Office: 770.662.8545 | www.purafil.com | OnGuard Smart Manual - 01
Preface
Airborne gaseous contaminants, as well as fluctuations in temperature and relative humidity, have always posed a threat
to everything from modern electronic equipment to centuries-old artwork and archives. In recent years attention h has
been focused on how we can monitor and control these variables in our environment, creating a new key term: Indoor Air
Quality (IAQ).
Purafil, Inc., the industry leader in air filtration systems, anticipated the need to merge technology with IAQ and created
the OnGuard atmospheric corrosion monitor. After thorough testing and development, Purafil introduced the patented
OnGuard Atmospheric Corrosion Monitor. For OnGuard’s development, Purafil received the R&D 100 Award, recognizing
the top 100 technologically significant products of the year.
Today, OnGuard is monitoring and protecting the environment in worldwide facilities such as: Santa Maria delle Grazie
(housing da Vinci’s Last Supper), Italy; the English Channel Tunnel, U.K. and France; Haindl Papier, Germany; British
Nuclear Fuels, U.K.; Honeywell, Yokogawa, and Georgia Pacific, USA.
Purafil thanks you for your purchase and we know you will be as pleased with your OnGuard unit as we are with its
development. For additional information or questions on the product contact:
Purafil, Inc.
2654 Weaver Way
Doraville, Georgia 30340 USA
Phone: [phone]
E-mail: www.purafil.com
Web: www.purafil.com

2654 Weaver Way | Doraville, GA 30340 | Office: 770.662.8545 | www.purafil.com | OnGuard Smart Manual - 01
Contents
The OnGuard Technology..................................................................................................................5
Introduction........................................................................................................................................5
How the OnGuard Works....................................................................................................................6
Technology........................................................................................................................................6
Cumulative Corrosion........................................................................................................................6
Incremental Corrosion.......................................................................................................................6
Temperature Effects on Corrosion ....................................................................................................7
Relative Humidity Effects on Corrosion.............................................................................................7
Standards..........................................................................................................................................7
Unpacking and Inspection .................................................................................................................8
Installing and Powering the OnGuard ..............................................................................................9
Mechanical Mounting ........................................................................................................................9
External Power..................................................................................................................................9
External DC Power Supply.........................................................................................................................9
Power Over Ethernet (POE) .......................................................................................................................9
Battery Operation................................................................................................................................9
Opening the OnGuard for Battery Installation....................................................................................9
Installing the Main Batteries ..............................................................................................................9
Initializing Sensors ...........................................................................................................................10
Communication via Ethernet ...........................................................................................................10
Password Protection .......................................................................................................................10
Local Area Network Connection......................................................................................................11
Static Address.................................................................................................................................13
Preferred method......................................................................................................................................13
Non-preferred method..............................................................................................................................14
Direct Connection (no Network).......................................................................................................15
Wireless Settings…………………………………………………………………………………………….19
Configuration ....................................................................................................................................20
Clock/Calendar ...............................................................................................................................20
Temperature, Relative Humidity and Pressure................................................................................21
Sensors...........................................................................................................................................21
Calibrate Temperature, Relative Humidity and Pressure.................................................................22

2654 Weaver Way | Doraville, GA 30340 | Office: 770.662.8545 | www.purafil.com | OnGuard Smart Manual - 01
Data Logger.......................................................................................................................................24
Setup...............................................................................................................................................24
Pop-Up Data Feature......................................................................................................................25
Data Table.......................................................................................................................................25
Logger Memory...............................................................................................................................26
Alarm Conditions..............................................................................................................................25
Email Settings...................................................................................................................................27
Basic Settings..................................................................................................................................27
Server Settings................................................................................................................................27
Triggers...........................................................................................................................................27
Email Information ............................................................................................................................28
Replacing Corrosion Sensors..........................................................................................................29
Current Outputs from Channels ......................................................................................................29
Appendix............................................................................................................................................30
LCD Menus .....................................................................................................................................30
Network Menu.................................................................................................................................30
Main Menu.......................................................................................................................................31
Alarm Menu.....................................................................................................................................31
Logger Menu...................................................................................................................................31
Version Menu..................................................................................................................................31
4-20 mA Calibration ..........................................................................................................................32
Introduction......................................................................................................................................32
Preparation......................................................................................................................................32
Output ......................................................................................................................................................33
Level.........................................................................................................................................................33
Plus and Minus Keys................................................................................................................................33
Step Amount.............................................................................................................................................33
Store Changes .........................................................................................................................................34
Procedure........................................................................................................................................34
Frequently Asked Questions ...........................................................................................................35

5
The OnGuard Technology
Introduction
Metal strips have been used to quantify the effects of the atmosphere on similar metal surfaces for decades. Originally,
the analysis of the reactive metal strips relied on simply determining the weight gain due to atmospheric gases reacting
with the base metal. Later, more involved laboratory analyses gave some additional information on what compounds
made up the resulting corrosion film that collected on the metal strips.
While this is a good technique, it requires that the metal strips be placed in the environment from 30 to 90 days and can
only report the total corrosion that has occurred during the test period. Corrosion, however, is most often an isolated
event, and seldom occurs at an equal rate over the 30-to-90-day testing period. The method allows no way to pinpoint
when any of the corrosion occurred, or to determine the severity of any particular corrosion event. Likewise, it cannot
detect what dramatic atmospheric changes, such as wind, temperature and humidity, have had on the corrosive activity
within indoor environments.
It is important to take corrective action at the time these dangerous atmospheric shifts occur instead of after damage from
corrosion has taken place. Getting information “real-time” gives users this advantage.
The OnGuard 1000 was the first instrument to provide real-time monitoring of environmental corrosion that can affect the
reliability of industrial electronics, computers, and control equipment. The OnGuard 1000 has also been used extensively
in museums and archives to monitor the environmental conditions that could irreparably damage precious artwork,
artifacts and archives. The OnGuard 2000 and related models are patented, second-generation instruments that provide
the same basic capabilities as the OnGuard 1000, with significant improvements in user interface, accuracy, and
application flexibility. The OnGuard Smart implements the most desired features of the OnGuard 2000, 3000, 4000
adding pressure measurements and Wi-FI Ethernet communications. In addition, the OnGuard Smart is housed in an
attractive enclosure that can address a variety ofmarkets.
The OnGuard provides real-time measurements of the amount of corrosion forming on copper and silver surfaces by
corrosive gases present in the local environment. It also measures the temperature and relative humidity of the
environment, both of which can affect the corrosion rate of these metals.
All of the OnGuard measurements for corrosion rates, temperature, and relative humidity can be related to the
International Society for Measurement and Control (ISA) Standard S71.04-2013: Environmental Conditions for Process
Measurement and Control Systems: Airborne Contaminants and ISA S71.01-1986: Environmental Conditions for Process
Measurement and Control Systems: Temperature and Humidity. The silver corrosion rate measured by the OnGuard is
reported in an environmental classification of the newly issued ISA Standard S71.04-2013. Similarly, the OnGuard
measurements can be related to various archive and museum standards being utilized around the world.
OnGuard Smart units are equipped with the standard sensor set (temperature/relative humidity, copper corrosion, silver
corrosion and pressure). The OnGuard is capable of logging the sensor measurements in internal memory at user-
selectable intervals, and this information is downloadable to a personal computer for viewing, graphing or archiving.

6
How the OnGuard Works
Technology
Corrosion on electronic components and contacts and on precious and semiprecious metal artifacts is characterized by
the buildup of various chemical reaction products (films) which form when corrosive gases come into contact with the base
metal. The sources of these gases often result from the types of processes being operated at the industrial site, chemicals
in use and/or general atmospheric contamination. They may also be transported from an adjacent facility so careful
attention should be given to potential sources of atmospheric corrosion outside the facility boundaries as well.
Typical corrosive gases are: hydrogen sulfide (H2S), chlorine (Cl2), oxides of sulfur and nitrogen (SO2, SO3, NO, NO2,
etc.), ozone (O3), ammonia (NH3), and hydrogen fluoride (HF). Therefore, corrosion films may be composed of reaction
products such as copper sulfide and oxide (Cu2S and Cu2O) on copper and silver sulfide and chloride (Ag2S and AgCl) on
silver. These reaction products cause an associated mass gain which can be directly correlated to the average corrosion
film thickness, in angstroms (Å), on the metal surface.
Measuring atmospheric corrosion on metallic surfaces has been done with a variety of techniques. The simplest and most
reliable is the measurement of the mass gain on a metal sample strip (often referred to as a “coupon”). The OnGuard
uses a patented technology to measure the corrosion that will occur on copper and silver surfaces using quartz crystal
microbalance sensors plated with either copper or silver. The plated crystal has a natural resonance frequency based
upon its mass. As corrosion films are formed, the sensor mass increases by the mass of the contaminant gases that have
reacted with the base metal plating. As a result, the crystal’s resonance frequency decreases.
By applying the proper conversion factors contained in the software of the OnGuard, the corrosion buildup that occurs
over the life of the corrosion sensor can be determined. This is referred to as Cumulative Corrosion. The rate of
corrosion buildup over a given time period can also be determined. This is termed Incremental Corrosion.
Cumulative Corrosion
Cumulative Corrosion is the total amount of corrosion that has accumulated on a metal surface. Corrosion is an ongoing
process, occurring when the conditions are correct for additional reaction of the contaminant gases with the base metal.
For surfaces like copper and silver, the onset of corrosion is evidenced by the appearance of a slight tarnish, which is the
actual corrosion film. Progressively, this tarnish gets darker and thicker. Cumulative Corrosion is reported to the
OnGuard in terms of angstroms (Å), which is 10-10 meters.
The OnGuard corrosion sensors have the capability to accumulate 4000 Å of Cumulative Corrosion. At this stage of
Cumulative Corrosion, the base metal copper and silver corrosion sensors will be completely black. If the OnGuard is
being used to monitor the effects gases have on other metallic surfaces, whether they are precious artifacts or electrical
circuit contacts, either visual tarnishing or electrical failures will have occurred prior to the OnGuard’s corrosion sensors
reaching their 4000 Å limit.
Incremental Corrosion
Incremental Corrosion is the amount of corrosion that has accumulated on a metal surface over a specific time period.
Incremental Corrosion can also be referred to as the rate of corrosion buildup. The OnGuard reports Incremental Corrosion
in terms of angstroms per twenty-four hours (Å/24 hours). The Incremental Corrosion is an indication of the severity, or lack
of severity, of a corrosion-causing event. In the OnGuard, the Incremental Corrosion is recalculated every 15 minutes for the
previous 24-hour period. Because Incremental Corrosion is updated every 15 minutes, significant changes in the rate of
corrosion can often be determined within a 15- minute time period. Less significant changes in the rate of corrosion may take
longer to detect.

7
Temperature Effects on Corrosion
Increases in Temperature can accelerate the rate of corrosion by increasing chemical reactions. Using the OnGuard to
monitor and record Temperature, increases or decreases in Cumulative Corrosion and Incremental Corrosion can be
correlated to Temperature effects. The Temperature sensor is read continuously, and the data is averaged over a one-
minute time period.
Relative Humidity Effects on Corrosion
Varying levels of Relative Humidity can significantly affect the rate of corrosion. Changes in the Relative Humidity can
result in condensation on surfaces within a space, and should corrosive gases be present, they can dissolve into this
water layer. Many corrosive gases are often referred to as “acid gases” in that when they are dissolved in water, the
resulting mixture is an acid. For instance, chlorine (Cl2) gas dissolved in water creates hydrochloric acid (HCl). Therefore,
Relative Humidity often needs to be carefully monitored and controlled in computer control rooms. The OnGuard
monitors and records Relative Humidity for correlation to events that are associated with increased rates of Cumulative
Corrosion and Incremental Corrosion. The Relative Humidity sensor is read continuously and the data are averaged over
a one-minute time period.
Standards
Standards can be used to define the limits of acceptable performance. These limits may be formally set by a committee
acting on behalf of an organization or informally set by an individual based upon a particular application.
Initially, the OnGuard has been set up with industrial standards for corrosion written by the Instrument Society of America
(ISA). These standards are ISA S71.04-2013: Environmental Conditions for Process Measurement and Control Systems:
Airborne Contaminants and ISA S71.01-1985: Environmental Conditions for Process Measurement and Control Systems:
Temperature and Humidity. They were written by a panel of experts in the corrosion field, ranging from manufacturers of
sophisticated electronics and gas-phase filtration to professional engineers and end users in the industrial marketplace.
The standards have been globally accepted and used in areas where sensitive electronics are housed in industrial
complexes.

8
Unpacking and Inspection
DO NOT REMOVE THE ONGUARD UNIT FROM THE SEALED PLASTIC BAG UNTIL
TIME OF INSTALLATION
1. Verify that the following items are included in the shipping box. If any item is missing, notify Purafil, Inc.
immediately at [phone] or800-222-6367.
- OnGuard
- Terminal Block (Transmitter)
- USB Flash Drive
o User manual
o Warranty form
o EC letter
o Terminal block drawing
2. Make a visual inspection of the OnGuard. Do not remove it from the sealed plastic bag for extended periods
until the time of installation. This insures that the corrosion sensors are not exposed to air contaminants
prematurely, which may shorten sensorlife.
3. Examine the OnGuard for any damage that may have occurred during shipment. If any obvious damage is
found notify the carrier immediately and callPurafil.
4. Fill out the WarrantyRegistration Card and return it to Purafil immediately. Failure to send in the Warranty
Registration Card may result in delayed receipt of future updates to OnGuard and may limit technical
support.
5. Check the packaging for any additional documentation that may have been included.

9
READ THIS BEFORE YOU CONTINUE
When setting up the OnGuard, after powering it and initializing the sensors, please contact
your IT department to help with connecting the OnGuard to a network and setup.
Installing and Powering the OnGuard
Although the OnGuard is designed to withstand corrosive industrial environments, the unit contains sensitive electronic
circuitry. Therefore, care should be taken to ensure that it is not dropped or handled roughly during installation.
Mechanical Mounting of the OnGuard
The OnGuard is designed to be mounted on a secure flat vertical surface. Use the screws provided and install in a level
orientation. There are two “keyhole-shaped” mounting holes on the rear of the OnGuard. The two mounting screws can
be positioned and installed using the mounting template provided in the appendix, which should be photocopied and
used for installation. The screws should be driven into the mounting surface until the bottom surface of the head of the
screw is approximately 0.1 inches (2mm) from the wall. The OnGuard’s mounting holes are then placed over the screws
and lowered into place. Adjust the screws for a firm fit.
External Power
There are two ways to provide external power to the OnGuard.
External DC Power Supply
The OnGuard can be powered by an externally supplied DC voltage between 12VDC and 36VDC. The power source
should be able to supply at least 500 mA of current. This voltage is applied to pins 11 and 12 of the 12-pin terminal block
on the bottom of the OnGuard (see the terminal block drawing on USB flash drive). Pin 1 of the terminal block is on the
left when viewed from the front, pin 12 on the right. The negative lead of the power source is connected to pin 11, and the
positive lead is connected to pin 12.
When operating from an external power supply the OnGuard will operate continuously and will not power down into
“sleep mode” as it does when powered from the batteries.
Power Over Ethernet (POE)
The OnGuard can also be powered by connecting the OnGuard to the Ethernet through the Ethernet port on the bottom of
the unit. All functions are available and the OnGuard will operate the same as if it is powered from an external power
supply.
Battery Operation
Opening the OnGuard for Battery Installation
Remove the OnGuard from the protective bag it was shipped in. Remove the two screws that hold the front half and the
back half of the case together. These are located in the middle on each side of the unit. With these screws removed the
case will come apart, providing access to the battery holders.
Installing the Main Batteries
The OnGuard is designed to operate on four standard “AA” alkaline batteries. The unit will begin operation when the last
of the four batteries is installed. For longest operating life, use “high capacity” batteries like the Duracell Ultra or Energizer
Max.

10
When the batteries are installed reassemble the case by installing the two screws that were removed to open the case.
Initializing Sensors
When the OnGuard is shipped from the factory, it is enclosed in a protective bag designed to minimize contaminant
access to the corrosion sensors. When batteries are installed or power is supplied and the unit begins to operate,
the first function the OnGuard performs is the initialization of the copper and silver corrosion sensors. This
process is initiated automatically, takes two hours and should not be interrupted until it is completed. Please
make sure the logger is off when initializing takes place. This process establishes the initial state of the sensors and
sets the reference for future operation. During this period the LCD display will turn off and the green LED will flash on and
off at about a 1 second rate.
Communication via Ethernet
The OnGuard is designed to communicate through an internal web interface, via the Ethernet, for setup and logging
purposes. Remember to power the OnGuard in one of the two external ways before trying to connect.
Password Protection
Below are the procedures to establish communication between the OnGuard and the computer via Ethernet. However,
once connected to the OnGuard, a password is required for the user to access the Network page and setup email
notifications or manually set the IP address. Once accessed, the user can click between any of the pages and return to
the Network page without having to re-enter the password. However, once the user closes the browser and tries to re-
access the page, a password is again required.
The default password is as follows:
• User Name: admin
• Password: password
User Name cannot be changed and is always “admin”. Password can be changed on the Network Page. It is limited to
10 characters in length.
In the event Password is lost or forgotten, it can be reset to “password” by holding down the OnGuard Down-Arrow key
(button 4) as power is applied. The key can be released as soon as the boot screen appears (about 2 seconds). The
boot screen will also display the text “PASSWORD RESET”.
The following page shows the Password entry field in the lower left corner of the Network Page.

11
Local Area Network Connection
By default, DHCP is enabled on the OnGuard. This means that it will acquire an address (dynamically) from the local network
router as soon as it is plugged into a network.
The new address is displayed on the OnGuard’s LCD screen for about 10 seconds whenever the Ethernet connection is
made or disconnected. Below is the OnGuard’s Network menu that appears to show a change in status of network
connectivity:

12
In this case, to connect to this OnGuard’s web interface, type “192.168.2.103” into your browser’s address bar. Below
shows the home page of this OnGuard at address 192.168.2.103:

13
Note that the dynamic address may change. If the OnGuard or the network router is power-cycled, the OnGuard may
be assigned a different address. Exact behavior will depend on the network router’s (or local DHCP server’s)
configuration.
Static Address
There are two methods to set a static address for an OnGuard device. The preferred method is to configure the local
router (or DHCP server) to assign the same address to the device every time it registers on the network. The other
method is to disable DHCP and set a fixed address in the OnGuard. This is not preferred because address conflicts may
occur due to setting multiple devices to the same address.
Preferred method
To define an address in the router (or DHCP server), the server must know the unique hardware address of the OnGuard
– the MAC address. The MAC address is displayed on the ONGuard’s network menu as shown below:

14
Enter this address in your router DHCP configuration with a desired address in order to specify a fixed address for the
OnGuard. Exact method will depend on the router’s make and model, but this is typically found in its settings page under
Configuration->Advance->DHCP. Consult your router’s manual.
Non-preferred method
The non-preferred method of setting a static address involves disabling DHCP and setting a fixed address in the OnGuard.
To do this, you must first gain access to the OnGuard web interface and select the network page as shown below.
Additionally, the numbers in red indicate the maximum text length of each text field.

15
Click “Enable DHCP” so that it is not checked, then enter the desired address in the “IP Address” field. Click “Save Config”
to save the settings. The device will reboot and then you must point your browser to the newly assigned address.
The device’s address is displayed on the OnGuard’s network menu as shown below and may be accessed by scrolling
through the menus using the devices “Menu” key on the front panel.
Direct Connection (no Network)
Finally, the device may be accessed directly from a PC/MAC without a proper network. This is accomplished by setting
your computer’s network adapter to a fixed address on the 192.168.2.x network; for example, 192.168.2.99.
From the Start menu, click Control Panel.

16
Double-click Network Connections.
Right-click the Local Area Connection icon, and then choose Properties.

17
On the General tab, highlight Internet Protocol (TCP/IP), and then click Properties.
Click “Use the following IP address:” button and enter 192.168.2.99. Click “OK”. A message asking for the “subnet mask”
will pop-up. Click “OK” and the subnet mask should populate itself. Pressing the Tab button on your keyboard should also
auto fill the subnet mask field. Click “OK” again to save the changes.

18
Then connect the OnGuard to the computer using a standard Ethernet cable. The OnGuard is programmed to default to
192.168.2.77 when no DHCP server is found. Point your browser to 192.168.2.77 to access its webinterface.
Once the configuration is complete, you will need to return the local area connection to the default settings. Return to the
local area Ethernet connection that was changed, open its properties and select “Obtain an IP address automatically.”
Click “OK” to save changes.

19
Wireless Settings
The OnGuard is designed to communicate through an internal web interface, via Wi-Fi, for setup and logging purposes.
Remember to power the OnGuard in one of the two external ways before trying to connect. The OnGuard will
display the available networks. Clicking on one of the networks will establish a connection.
Configuration
The OnGuard may need to be configured to operate properly in your location, and provide the data desired. The
configuration includes setting up the date and time and temperature and relative humidity limits. The OnGuard internal
web interface is used for configuration. To connect with the OnGuard for configuration please see the communication via

20
Ethernet section. A summary of the available functions is listed below:
Clock/Calendar Tab
The date and time must be set. Make sure the OnGuard is powered and connected to the Ethernet and communication is
established. Once the web interface is accessed, click on the “Settings” tab. Enter the time and date in the spaces
provided and click the “Set” buttons.