Watts HF scientific Air Sentinel II 110010 User manual

Installation and Operation Manual
Air Sentinel™ II Purge Controller
Model Air Sentinel™ II 110010
Catalog No 100038B
Rev 4
IOM-HF-Air Sentinel II-100038B
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information can
result in death, serious personal injury, property damage, or
damage to the equipment.
Keep this Manual for future reference.

2
Table of Contents
Specifications ...................................................................................... 3
1.0 Safety............................................................................................ 4
1.1 Symbols Used in Manual ........................................................... 4
1.2 Use in Explosive Environments Safety........................................ 4
2.0 Orientation..................................................................................... 4
2.1 Product Description................................................................... 4
3.0 Installation and Commissioning...................................................... 5
3.1 Air Supply .................................................................................. 5
3.2 Electrical Power Input Connections............................................ 5
3.3 Electrical Power Output Connections......................................... 5
3.4 Electrical Alarm Connections ..................................................... 5
3.5 Mechanical Mounting................................................................. 5
4.0 Air Sentinel II Purge Controller Operation ....................................... 6
4.1 Startup ...................................................................................... 6
4.2 Indicator Lamps......................................................................... 6
5.0 Programming................................................................................. 6
6.0 Instrument Labels.......................................................................... 7
7.0 Limited Warranty ........................................................................... 8

3
Specifications
Enclosure 316 Stainless Steel
Mounting 10 Studs, ¼"-20
Display Indicators Two Bi-color (Red & Green ) LEDs
Alarms Two 1 Form A (SPST-NO) Relay
Contacts Rated 2A at 125VAC or 2A at 30VDC
Control Output One 2 Form A (SPDT-NO) Relay Internally Connected To Mains
Contacts Rated 2A at 240VAC
Electrical Connections One Removable Power Input, Once removable Power Output
Operating Temperature Range 0°C – 55°C (32°F – 131°F)
Power Supply 100-240 VAC, 47-63 Hz, 5A
Environmental Conditions IP 66
Altitude up to 2000 meters
Up to 95% RH (non-condensing)
IECEx Hazloc Rating Ex mb [pxb] IIC T4 Gb 0°C ≤ Ta ≤ 55°C
IECEx File # IECEx LC 14.0016
Recommended Supply Gas Water and oil free, - Dry Air, Particles <5u, ISA Grade Hydrocarbon Free. Full time, clean dry air at 0-50 SLPM
Pressure Measurement Range 2-10 mbar
Regulatory Compliance
And Certifications
CE Approved, ETL listed to UL 61010-1 Issued May 11 2012 3rd Ed & ETL certified to CSA 22.2 No. 61010.1 issued May 11 2012
EN61326:2006

4
1.0 Safety
This manual contains basic instructions that must be followed during
the installation, commissioning, operation, care and maintenance of the
instrument. The safety protection provided by this equipment may be
impaired if it is commissioned and/or used in a manner not described
in this manual. Consequently, all responsible personnel must read this
manual prior to working with this instrument.
In certain instances “Notes”, or helpful hints, have been highlighted
to give further clarification to the instructions. Refer to the Table of
Contents to easily find specific topics and to learn about
unfamiliar terms.
This manual is intended to be used in
conjunction with the operating manual for the
instrument the Air Sentinel II is installed into.
1.1 Symbols Used in this manual
1.2 Use in Explosive Environments Safety
2.0 Orientation
2.1 Product Description
The Air Sentinel II is a purge controller that can be used to provide
protection for electrical equipment operating in potentially hazardous
areas. The Air Sentinel II controls the equipment power and measures
the air flow and pressure of the enclosure. The equipment must be
placed into a suitable electrical enclosure. The Air Sentinel II meets
the requirement of IEC 60079-0 & 60079-2. It has been certified to
IECEx hazardous location rating of Ex pxb mb IIC T4 Gb 0°C ≤ Ta ≤
55°C and Explosive Atmospheres – Part 18: Equipment Protection by
Encapsulation “m”, IEC 60079-18:2009.
This symbol identifies hazards which, if not avoided,
could result in death or serious injury
This symbol identifies hazards which, if not avoided,
could result in minor or moderate injury or damage to
the equipment.
This symbol identifies important information, practices
or actions.
This pictorial alert you to the need read the manual,
possibly at a different section.
Figure 1: The Air Sentinel II
From the diagram below, the major components can be located.
WARNING
!
In the interests of safety the operator must ensure the
atmosphere where the instrument is located is safe from gases,
vapors, dust or other flammable conditions whenever the
instrument is opened for service or maintenance. At all other
times the enclosure door must be kept closed with purge air
connected the purge system operating with all GREEN lamps
lit indicating safe operation.

5
3.1 Air Supply
This instrument requires water free and oil free air, Dry Air, Particles
<5u, ISA Grade Hydrocarbon Free. Requirements are full time, clean
dry air at a cabinet pressure of 0-10 mbar at a flow rate of 0-50 SLPM.
Please note that 10 mbar and 50 SLPM are maximum values that will
not probably be attained in practice.
3.2 Electrical Power Input Connections
The Air Sentinel II purge controller requires 100-240 VAC 47-63 HZ.
A circuit breaker must be placed prior to the power connection in close
proximity and within easy reach to allow for service. This circuit breaker
must be marked to indicate that it is a disconnecting means for the
instrument. The rating of the circuit should be 5A.
Supply power connections are made ONLY to top “MAINS” connection
on the back of the Air Sentinel II purge controller:
Terminal 3: Earth Ground
Terminal 2: Neutral
Terminal 1 Line Or Hot
Suitable wire would be stranded, 3 conductors 18-12 AWG copper or
tin plated copper with a voltage rating of 600VAC with a temperature
rating of 90˚ C or higher.
Common earth bond points are provided both inside the enclosure
on the chassis and outside of the enclosure. This terminal set can
be removed for easier connections. Please ensure this terminal set is
properly tightened using the two side screws.
3.3 Electrical Power Output Connections
The second or lower three terminals are controlled power output.
This is where a powered device is connected to ensure power is not
applied unless the enclosure is purged and pressurized. The output is
connected to the mains power after the purge time has been exceeded
assuming the enclosure is under pressure and air is exiting the vent.
The load should not exceed 2A at 240VAC.
This terminal set can be removed for easier connections. Please ensure
this terminal set is properly tightened using the two side screws.
Figure 2: Air Sentinel II Electrical Connections
3.4 Electrical Alarm Connections
Three relay (1 Form A) alarm connections are supplied that can be used
to indicate an Alarm condition under the following modes of operation:
1. Loss of Pressure or Flow. Under this condition the front panel
LED labeled Pressure will turn RED and the associated Alarm
contacts will close.
2. Purge Timer enabled. Under this condition the front panel LED
labeled Timer will turn RED and the associated Alarm contacts
will close.
These contacts are rated 2A at 250VAC or 2A at 24VDC.
Refer to Figure 2 for the alarm connections. These connections
terminals are NOT removable.
3.5 Mechanical Mounting
Figure 3: Air Sentinel II Dimensions
The Air Sentinel II is mounted to an enclosure using the 10, ¼"- 20
studs. The recommended hardware is a ¼" flat washer and locking nut,
or the provided locking nut with the built-in washer. The recommended
enclosure opening is shown in Figure 4.
From the previous Figure 1 you will notice three ports labeled Air Purge,
Pressure Port and Drain Vent. The Air Purge is the main vent that
all enclosure exhaust air should exit the enclosure through. This Air
Sentinel II measures this air to ensure continuous venting is occurring.
The Pressure Port is where the Air Sentinel II measures the enclosure
pressure to ensure the enclosure is kept above atmospheric pressure
(overpressure). The Drain Vent is an optional atmospheric pressure vent
for certain applications such as venting a drain. If this vent is not used it
must be capped.
3.0 Installation and Commissioning
WARNING
!
Only qualified electricians should be allowed to perform the
installation of the instrument as it involves a line voltage that
could endanger life.

6
Figure 4: Enclosure Opening
4.0 Air Sentinel II Purge Controller
Operation
The Air Sentinel II purge controller is mounted on the side of the
main enclosure. This controller will ensure proper safe operation of
the attached equipment. If of all the required conditions are met, the
controller will act as a power governor. It does this by monitoring the
pressurization of the main enclosure with clean dry air. The Air Sentinel
II has two indicator lamps. Should this air supply pressure fail, the top
lamp on the Air Sentinel II unit will turn RED and power to the rest of
the instrument is disconnected.
4.1 Start Up
When power is applied to the Air Sentinel II for the first time, ensure
that the air supply is connected as stated in section 3.1 and the main
enclosure is closed and locked. Once power is applied, the Air Sentinel
II will go through a purge period where at least five volumes of the
enclosure are pushed through the Air Purge port and out the vent.
During the purge period the Air Sentinel II’s TIMER lamp will be RED
indicating the purge is in process and no power is output.
At the complete of the purge, TIMER lamp will go GREEN and power
will be applied to the rest of the system. As long as the proper air
supply conditions are met the Air Sentinel II will continue to operate.
: This lamp indicates if the minimum enclosure
pressure is met
: This indicates if the timer is enabled
Lamp Color Matrix Meaning Power Out
Both lamps GREEN Safe Operation Power ON
TIMER Lamp RED Instrument Purging Power OFF
PRESSURE lamp RED Unsafe Operation
Pressure Low
Power OFF
NO Lamps No power out applied No power applied;
everything off
Using the table above, you can quickly determine the operating
condition of the power out.
Under normal safe operation both GREEN lamps should appear.
5.0 Programing
The Air Sentinel II is factory programmed for the application to ensure
that during purge, at least five volumes of air are exchanged during
the Timer period. This will obviously vary with internal pressure and the
volume of the enclosure that the system is operated at.
When used in the HF scientific SSR-Ex the purging time is set to
3 minutes.
Each Air Sentinel II is factory programmed and checked for flow rate,
internal (enclosure) pressure, and timer period.
To meet the requirements of the IEC 60079-2 the minimum
overpressure is 50 Pa or 0.5 millibar. To account for potential variances
we recommend that the minimum setting is 1 to 2 millibar. This
pressure should be regulated with an internal pressure regulator.
To ensure safe operation, information regarding the intended
operating pressure, flow rate and timer (purge) period must be
sent to HF scientific as part of the order so the Air Sentinel II can
be programmed accordingly.
NOTICE
After power is applied the Air Sentinel II requires 10 seconds
to respond while it runs a self-test.
NOTICE
4.2 Indicator Lamps
The Air Sentinel II indicator lamps are a very quick way to determine
to operation of the controller and thus the safety condition of the
connected instrument or equipment.
The Air Sentinel II has two LEDs that can be either RED or GREEN.
WARNING
!
Do not apply power to the Air Sentinel II purge controller
unless the area has been properly tested and is known not to
contain explosive materials.

7
Lamp Color Matrix Meaning Power Out
Both lamps GREEN Safe Operation Power ON
TIMER Lamp RED Instrument Purging Power OFF
PRESSURE lamp RED Unsafe Operation
Pressure Low
Power OFF
NO Lamps No power out applied No power applied;
everything off
Purpose Location Label
Product name and
certifications
Front of Air Sentinel II
Serial number,
manufacturer,
part number,
power rating,
CE & UL marking
Front of Air Sentinel II
Warning and
informational
Front of Air Sentinel II
6.0 Instrument Labels
The following labels should be applied to the outside of the enclosure:
PRINTER SET UP
PRINT IN CMYK
WIDTH 3.25 INCHES
HEIGHT 4.0 INCHES
OFFSET
HORIZONTAL 66
VERTICAL 0
PRINT PROCESS
PRESSURIZED ENCLOSURE
L# 74055
Minimum Over Pressure: ≥ 0.6 Millibar
Maximum Over Pressure: 4 Millibar
Minimum Purge Flow Rate: 35 SLPM
Minimum Purging Duration: 3 Minutes
Maximum Leakage Rate: 45 LPM
Electrical Compartment shall not be opened unless all power
has been removed!
PRESSURIZED ENCLOSURE
L# 74055
Minimum Over Pressure: ≥ 0.6 Millibar
Maximum Over Pressure: 4 Millibar
Minimum Purge Flow Rate: 35 SLPM
Minimum Purging Duration: 3 Minutes
Maximum Leakage Rate: 45 LPM
Electrical Compartment shall not be opened unless all power
has been removed!

7.0 Limited Warranty
Watts Regulator Co. (the “Company”) warrants each ballast water market instrument product to be free from defects in material and workmanship
under normal usage for a period of two (2) years from first use or three (3) years from date of the Company’s invoice from the original sale of the
product, whichever occurs first. In the event of such defects within the warranty period, the Company will, at its option, replace or recondition
the product without charge. Parts which by their nature are normally required to be replaced periodically, consistent with normal maintenance,
specifically reagents, desiccant, sensors, electrodes and fuses, are excluded. Also excluded are accessories and supply-type items.
Proof of purchase from the Company (Company invoice or paid order confirmation) and/or first use (commissioning) must be provided when making
a product warranty claim.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH
RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESSED OR IMPLIED. THE COMPANY HEREBY
SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company
shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or
replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism,
negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the
Company has no control. In addition, the Company shall not be responsible for any costs incidental to the Company’s warranty response efforts,
including, without limitation, costs associated with the removal and replacement of systems, structures or other parts of facilities, de-installation,
decontamination and re-installation of products, or transportation of products to and from the Company. This warranty shall be invalidated by
any abuse, misuse, misapplication, improper installation or improper maintenance, or alteration of the product, or use of any parts or accessories
(including but not limited to reagents) not provided by the Company.
Some states do not allow limitations on how long an implied warranty lasts, and some states do not allow the exclusion or limitation of incidental or
consequential damages. Therefore the above limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may
have other rights that vary from State to State. You should consult applicable state laws to determine your rights. SO FAR AS IS CONSISTENT
WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR
FROM THE DATE OF ORIGINAL SHIPMENT.
IOM-HF-Air Sentinel II-100038B 2225 © 2022 HF scientific
USA: T: [phone] • Toll-Free [phone] • F: [phone] • HFscientific.com
Latin America: T: (52) 81-1001-8600 • HFscientific.com