Hansen HLM2 User manual

Specifications, Applications,
Service Instructions & Parts
GAS DETECTION
SENSORS, MONITORS
& ALERT SYSTEMS
Bulletin A100b
JAN 2009
For Refrigerants and
other Common Gases
Standard Gas Sensor
Standard Gas Sensor
INTRODUCTION
Hansen Technologies offers a complete line of industrial
quality Gas Detection Sensors, Monitors and Alert
Systems for refrigerants and other common gases.
These state-of-the-art gas detection products utilize a
range of sensing technologies to suit a given application.
Available in several configurations to meet various
application requirements with optimum accuracy and
reliability.
APPLICATIONS
Hansen Gas Sensors are suitable for use in industrial
refrigeration engine rooms, cold storage rooms,
processing rooms, truck docks, and for relief valve vent
lines. They are also suitable for use in supermarkets,
and large institutional and commercial buildings.
Typical gas detection applications include Ammonia,
Carbon Dioxide (CO2), Hydrocarbons, HFCs, HCFCs
and CFCs.
ADVANTAGES
Hansen uses a wide variety of sensing technologies
including electrochemical, semiconductor and infrared
sensors to selectively detect most gases. These sensors
continuously determine the level of gas present in the
surrounding environment. The analog outputs (4-20mA
or 0-10V DC) can interface with nearly any existing
monitor, computer or PLC controller.
The sensing elements (except Basic and Extreme Gas
Sensors) are mounted externally on the enclosure. This
helps to provide quick response to potential leaks,
particularly in still air. Electronics are sealed in a NEMA4
enclosure (except Basic Gas Sensor) which protects them
from moisture, dust and the surrounding gases, which in
the case of ammonia can shorten the life of electronics.
The sensing elements are easily replaced.
Gas Sensors have built-in visual and audible alarms.
An auxiliary one amp SPDT relay output is standard.
Testing and recalibration procedures are simple.
KEY FEATURES–GAS SENSORS
Accurate, fast responding•
Linear 4-20mA or 0-10V DC output•
Audible alarm•
Power indicator•
SPDT alarm relay (Fail Safe Operation)•
24V AC/DC low voltage power•
Shipped factory calibrated and tested•
CE approved•
KEY FEATURES–MONITORS
Visual alarm•
Audible alarm•
Power indicator•
Low level alarm relay•
High level alarm relay•
Fault relay (HLM6 only)•
Economical•
CE approved•
KEY FEATURES−GAS ALERT SYSTEM
Provides local display and alarm based on•
measured target gas level via gas sensor
Visual alarm, Amber LED light•
Audible alarm (mutable)•
Power indicator, Green•
Numeric PPM reading•
Bright LED Display•
Shipped factory calibrated and tested•

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A100b
JAN 2009
SELECTING GAS SENSOR TYPES
Hansen Gas Sensors are available in several types of
enclosures to match the environmental and operating
conditions.
PORTABLE GAS DETECTION UNIT
Portable Gas Detection unit includes
the handheld unit, battery charger,
extension wand, spare filters, voltage
output cable, accessories for calibration,
and sensor module keeper for four
sensors in a carrying case. Sensor
modules sold separately. Portable
Unit, p/n 31-1010.
GAS SENSOR ACCESSORIES
Sensor Element Shield
The Sensor Element Shield can be screwed on to the
end of the gas sensor to help protect the sensor from
rain, dust, hose directed water, and debris floating in the
air. It can be installed on the Standard, Harsh, Extreme
and Explosion Proof gas sensors. The shield may slow
response time slightly depending on the surrounding
air flow conditions. Shield, p/n 31-1002.
Standard Gas Sensor
For operating temperatures down to
0ºF (-17ºC). NEMA4 (IP65) watertight
enclosure. Mountable indoors or
outdoors (out of direct sunlight).
Enclosure is ABS material with a
gasketed cover; single ½˝ conduit
knockout is provided.
Harsh Environment Gas Sensor
For operating temperatures down
to -40ºF (-40ºC) for wet/humid areas.
Enclosure is NEMA4 (IP65) ABS
material; conduit connection must be
vaporproof.
Extreme Environment Gas Sensor
For operating temperatures down to
-60ºF (-51ºC). Features a stainless steel
metal enclosure and equipped with an
integral heater and thermostat for low
temperature operation. Enclosure is
NEMA4X (IP65); conduit connection
must be vaporproof.
Note: Auxilliary power required when
used with Hansen monitors HLM2 and
HLM6 and Gas Alert System.
Vent Line Gas Sensor
For operating temperatures down to
-40ºF (-40ºC). Enclosure is NEMA4 (IP65)
ABS material. Gas sensing element is
in a separate carbon steel housing with
an 1˝ NPT threaded connection; cable
is 10 feet (3 meters).
Explosion Proof Gas Sensor
For operating temperatures down to
-40ºF (-40ºC). Enclosure is NEMA7
Aluminum. Used where regulations
and codes specify; consult factory with
specific requirements. Class I, Div II,
Group C and D.
Basic Gas Sensor
For operating temperatures down to 0ºF
(-17ºC). For commercial applications
such as supermarket refrigeration
systems and air conditioning chillers.
Enclosure is NEMA1 (IP41) for indoor
installations; enclosure is ABS material.
Low voltage cable wiring only. (Not
available for Ammonia).
QUICK DISCONNECT
PLUG KIT
Quick Disconnect Plug Kit
The Quick Disconnect Plug Kit can be added to the gas
sensor to provide a means of easily removing the gas
sensor for recalibration. This feature comes in handy
for gas sensors installed in blast cells, low temperature
rooms and hard-to-reach places. The gas sensor
cable can be quickly disconnected and the entire gas
sensor removed or replaced with a bench recalibrated
gas sensor. The gas sensor can then be brought to an
alternate location for recalibration or sensing element
replacement. Quick Disconnect Plug Kit, p/n 31-1001.
Option only available for field installation. Supplied
cable is 2 feet (0.6 meters) in length.
SHIELD
Harsh Model with Shield
Harsh Model with Quick Disconnect Plug Kit
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3A100b
JAN 2009
GAS SENSOR SPECIFICATIONS
BASIC STANDARD HARSH VENT LINE EXPLOSION
PROOF EXTREME
OPERATING TEMPERATURE
RANGE
0ºF TO 105ºF
(-17ºC TO 40ºC)
0ºF TO 105ºF
(-17ºC TO 40ºC)
-40ºF TO 105ºF
(-40ºC TO 40ºC)
-40ºF TO 105ºF
(-40ºC TO 40ºC)
-40ºF TO 105ºF
(-40ºC TO 40ºC)
-60ºF TO 105ºF
(-51ºC TO 40ºC)
OPERATING CURRENT @ 24V DC 230mA/6W 50mA/1W 280mA/7W 280mA/7W 280mA/7W 1900mA/46W
OPERATING CURRENT @ 24V AC 460mA/11VA 100mA/2VA 560mA/13VA 560mA/13VA 560mA/13VA 2100mA/50VA
VOLTAGE REQUIREMENTS 12-24V AC/DC* 24V AC/DC*
HUMIDITY RANGE
(NON-CONDENSING) 0-95% 0-100%
MAX. LOOP RESISTANCE 1000 OHMS
OUTPUT 4-20mA, 0-5V, 1-5V, 0-10V, 2-10V DC
4-20mA SIGNAL OUTPUT Isolated, 2 wire
PLACE SENSOR
NEAR OPERATING
EQUIPMENT
OPERATING
EQUIPMENT
PLACE SENSORS
AROUND PERIMETER
OF LARGE ROOM
AIR FLOW
PLACE SENSOR(S)
BETWEEN EQUIPMENT
AND EXHAUST FAN
12" - 24" FROM CEILING
LIGHT GASES (AMMONIA) HEAVY GASES (CO2, HALOCARBON)
MOUNT NEAR GROUND LEVEL
GAS SENSOR LOCATION
Sensors should be located in an accessible area
for maintenance and testing, but away from moving
equipment that could accidentally come in contact with
the sensor. Avoid thermal extremes (close to heaters)
and do not place unprotected in direct, strong drafts/
airflows, near exit doors, or areas where falling water or
condensing moisture are present. If high humidity is
always present, power up the unit as soon as possible,
as long term exposure can shorten the life of the gas
sensing element. Select the unit for harsh environments
where a condensing atmosphere may be present. In
blast freezers, mount the gas sensor below the coil to
avoid high moisture and steam during defrost.
The two generally accepted methods of locating sensors
are “Point” and “Perimeter” detection. “Point” detection
is where sensors are located near the most likely sources
of leakage. “Perimeter” detection is where sensors
completely surround the area in question. The size and
nature of the area will help to decide which method is
the most appropriate. Air flow should be considered
in a ventilated room. Place sensors downstream of
potential leak points.
Any sensor which is to be used for detecting a gas
with a vapor density greater that one (i.e. heavier
than air) should generally be located nearer ground
level. Conversely, for any lighter than air gases such
as ammonia, the sensor needs to be located higher up.
Typically ammonia sensors are mounted 12˝ - 24˝ (.3 to
POINT DETECTION
PERIMETER DETECTION
VENTILATED ROOM
MOUNTING HEIGHT OF SENSORS
.5m) from the ceiling. Sensors should not be located
too close to the ceiling as hot air trapped under the
ceiling may act to buffer the target gases from reaching
the sensor.
The number of sensors in each area is a function of local
codes and regulations and the customers’ guidelines
for gas detection.
*AC or DC user selectable. See pages 6 and 7 for configuration.

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JAN 2009
GAS DETECTION SYSTEM CONFIGURATIONS
There are a number of typical installation configurations to meet national and local codes.
RELIEF VALVE VENT LINE
Often the vent line is extended high above the ground or roof. The sensor element can be installed near the outlet of
the vent line and the gas sensor electronics mounted at a convenient height for servicing. A small length of tubing
can be run for injecting test gas near the sensor element. Install a plug with a small opening to allow a small air flow
to clear fugitive gases and detected gas after a release. Hansen recommends the alarm setting at 5000 PPM.
For water diffuser systems where the relief valve vent piping is diverted into a water diffusion tank, install the vent
line sensor on the diffusion tank exhaust vent, not on the piping to the diffusion tank.
LOCAL AND REMOTE VISUAL/AUDIBLE ALARM
Sometimes it may be advantageous to have both local and remote displays and alarms. A display/alarm control
inside or just outside of a room can be monitored and the same display/alarm or a Hansen monitor in the control
room can also alert the operator to an abnormal condition in the plant.
STAND ALONE CONTROL
The Hansen Gas Sensor can operate as a stand alone device. All that is needed is a 24V AC/DC power supply for
the gas sensor and auxiliary devices for light, horn or digital readout, such as the Hansen GAS Alert System.
INDOOR OUTDOOR
VISUAL
AUDIBLE
GAS
SENSOR
VISUAL
A
UDIBLE
A
LARM ALARM
ALARM
ALARM
INDOOR OUTDOOR
VISUAL ALARM
AUDIBLE ALARM
GAS
SENSOR
INSIDE SPACE OUTSIDE SPACE
GAS SENSOR ELEMENT
10' (3m) CABLE, MAX
WEATHER PROOF
GAS SENSOR ELECTRONICS
RELIEF LINE DISCHARGE HEADER
DRIP LEG
INSTALL
GAS SENSOR
ELEMENT WITHIN
2' (.7m) OF
DISCHARGE
VENT LINE APPLICATION
PROTECT
EXIT WITH
SUITABLE
OPTIONAL TUBING
LINE For "BUMP" TESTING
GAS AND AIR PURGE ROOF LINE
PIPE TEE
GAS SENSOR ELEMENT
1" X 3/4"
TO ALLOW A SMALL AMOUNT OF
AIR FLOW TO CLEAR DETECTED
GASES AND AVOID FALSE ALARMS
REDUCING BUSHING
SCREEN

5A100b
JAN 2009
*ADD 3.25” (83) FOR SHIELD
WIRING GAS SENSORS
Install the Hansen Gas Sensor in an area where operating
personnel can easily monitor the remote sensor. Refer
to Gas Sensor Location on page 3 for suggestions on
proper placement of Remote Sensors.
Use three-wire (VDC supply voltage), twisted pair
shielded cable such as Belden 8770 or equivalent to
connect the gas sensor to the gas monitor (page 13),
GAS Alert System (page 17), customer supplied PLC or
computer (page 18). When powering the gas sensor
from a VAC power supply use four-wire, twisted pair
shielded cable, such as Belden 82418 or equivalent.
Connect the power input wires to terminals ØV and +V.
Set applied voltage jumper to appropriate AC or DC
position. Extreme Gas Sensor requires an additional
external 24V AC or DC power supply wired with 18 AWG
cable. Refer to Fig. K for wiring details. Connect the
signal wire to terminal I for 4-20mA output or V terminal
for 1-5 volt output. The 4-20mA output is best for long
distances to the monitor and where electrical noise is
a problem. The voltage output is for short distances
within 10 feet (3 m) of the monitor. The maximum 4-20mA
cable length is 1000 ft (300 m).
Under no circumstances should the gas sensor low
voltage signal wires be in a common conduit, tray or
wiring panel with power wiring over 48 volts. Do not run
wires near variable frequency drive (VFD) equipment.
When using the gas sensors connected directly to a
customer supplied PLC or computer, refer to Fig. J for
wiring details.
Hansen recommends backup of gas detection system
with an uninterruptable power supply to provide battery
backup in the event of power failure.
INSTALLATION
Mounting the gas sensor varies by model. Refer
to Installation Dimensions below for mounting
requirements.
SENSING ELEMENT
Typical sensor life is based on normal operating
conditions. Exposure to high levels of the target gas
will shorten these times. The typical sensor life of the
electrochemical gas sensor element is 2-3 years; typical
sensor life for semiconductor element is 7-8 years; and
typical sensor life for infrared element is 8-10 years.
Recalibration should be performed at least once a year.
Calibration can be performed locally at sensor installation
site. If desired results cannot be achieved or if signal
reads 0.5mA, replacement of the sensor element may be
required. See Sensor Element Replacement section
for further instruction.
Note: Insurance companies, local and state agencies
may require more frequent testing and calibration; refer
to insurance carrier mandates as well as local and state
codes.
INSTALLATION DIMENSIONS
INCHES (MM)
BASIC STANDARD & HARSH
EXTREME EXPLOSION PROOF

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JAN 2009
ELECTROCHEMICAL SENSOR—AC VOLTAGE
(SHOWN WIRED FOR 4-20MA OUTPUT)
FIG. A
SEMICONDUCTOR SENSOR—AC VOLTAGE
(SHOWN WIRED FOR 4-20MA OUTPUT)
FIG. B
6
5
4
3
2
1
Sensor Voltage (VS)
0 V Pin
Alarm Horn & Relay Set Point Voltage (Ref 1)
Horn and Alarm
Relay set point
HORN
ZZero
S
Calibration
Screws
A
G
R
Span
External Sensor Element 4 Wire Connection
(Standard and Harsh Environment Model)
Horn & Alarm Delay - JP5&JP6 off: no delay
JP5 on only: 1 Minute
JP6 on only: 5 Minutes
JP5&6 on: 10 Minutes
JP3 - on: 4-20mA / 2-10V / 1-5V output
JP2 - on: Horn enabled
JP1 - on: 0-5V / 1-5V / 4-20mA output
off: 0-5V / 0-10V output
off: 0-10V / 2-10V output
*Factory Default
*
*
*
*
No Jumper
To Monitor or PLC
NO NC
COM
+V
V
0 V
0 V
I
{
Relay Output
4-20mA output
(POWER)
(COM)
(SIGNAL)
MULTI-WIRE SHIELDED CABLE
(GROUND SHIELD AT OTHER END)
Voltage Selector - "D": 24V DC
"A": 24V AC *
D
A
Fail Safe Relay - Relay engerized
to normally open
position when
power applied
(POWER)
NO NC
COM
+V
V
0 V
0 V
I
{
Relay Output
6
5
4
3
2
1
Horn & Alarm Delay - JP5&JP6 off: no delay
JP5 on only: 1 Minute
JP6 on only: 5 Minutes
JP5&6 on: 10 Minutes
JP3 - on: 4-20mA / 2-10V / 1-5V output
JP2 - on: Horn enabled
JP1 - on: 0-5V / 1-5V / 4-20 mA output
off: 0-5V / 0-10V output
off: 0-10V / 2-10V output
Sensor Voltage (VS)
0 V Pin
Alarm Horn & Relay Set Point Voltage (Ref 1)
Horn and Alarm
Relay set point
HORN
ZZero
S
Calibration
Screws
A
*Factory Default
*
*
*
*
G
RSpan
4-20mA output
External Sensor Element 4 Wire Connection
(Standard and Harsh Environment Model)
No Jumper
(POWER)
(COM)
(SIGNAL)
MULTI-WIRE SHIELDED CABLE
(GROUND SHIELD AT OTHER END)
Voltage Selector - "D": 24V DC
"A": 24V AC *
D
A
Fail Safe Relay - Relay engerized
to normally open
position when
power applied
40 dB @ 2' BASIC
(POWER)

7A100b
JAN 2009
ELECTROCHEMICAL SENSOR—DC VOLTAGE
(SHOWN WIRED FOR 4-20MA OUTPUT)
FIG. C
SEMICONDUCTOR SENSOR—DC VOLTAGE
(SHOWN WIRED FOR 4-20MA OUTPUT)
FIG. D
6
5
4
3
2
1
Sensor Voltage (VS)
0 V Pin
Alarm Horn & Relay Set Point Voltage (Ref 1)
Horn and Alarm
Relay set point
HORN
ZZero
S
Calibration
Screws
A
G
R
Span
External Sensor Element 4 Wire Connection
(Standard and Harsh Environment Model)
Horn & Alarm Delay - JP5&JP6 off: no delay
JP5 on only: 1 Minute
JP6 on only: 5 Minutes
JP5&6 on: 10 Minutes
JP3 - on: 4-20mA / 2-10V / 1-5V output
JP2 - on: Horn enabled
JP1 - on: 0-5V / 1-5V / 4-20mA output
off: 0-5V / 0-10V output
off: 0-10V / 2-10V output
*Factory Default
*
*
*
*
No Jumper
To Monitor or PLC
NO NC
COM
+V
V
0 V
0 V
I
{
Relay Output
4-20mA output
(POWER)
(COM)
(SIGNAL)
MULTI-WIRE SHIELDED CABLE
(GROUND SHIELD AT OTHER END)
Voltage Selector - "D": 24V DC
"A": 24V AC *
D
A
Fail Safe Relay - Relay engerized
to normally open
position when
power applied
NO NC
COM
+V
V
0 V
0 V
I
{
Relay Output
6
5
4
3
2
1
Horn & Alarm Delay - JP5&JP6 off: no delay
JP5 on only: 1 Minute
JP6 on only: 5 Minutes
JP5&6 on: 10 Minutes
JP3 - on: 4-20mA / 2-10V / 1-5V output
JP2 - on: Horn enabled
JP1 - on: 0-5V / 1-5V / 4-20 mA output
off: 0-5V / 0-10V output
off: 0-10V / 2-10V output
Sensor Voltage (VS)
0 V Pin
Alarm Horn & Relay Set Point Voltage (Ref 1)
Horn and Alarm
Relay set point
HORN
ZZero
S
Calibration
Screws
A
*Factory Default
*
*
*
*
G
RSpan
4-20mA output
External Sensor Element 4 Wire Connection
(Standard and Harsh Environment Model)
No Jumper
(POWER)
(COM)
(SIGNAL)
MULTI-WIRE SHIELDED CABLE
(GROUND SHIELD AT OTHER END)
Voltage Selector - "D" : 24V DC
"A" : 24V AC *
D
A
Fail Safe Relay - Relay engerized
to normally open
position when
power applied
40 dB @ 2' BASIC
To Monitor or PLC

8
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JAN 2009
SETTING ADJUSTMENTS OF SENSORS
There are several selectable features included in the
Hansen Gas Sensor. Refer to pages 6 and 7 for the
adjustable features. Note the adjustment screws on
the circuit board for the electrochemical sensor have
a different layout then the semiconductor sensor. The
jumpers may be moved without shutting off the power.
With the use of a 12-24V AC/DC power source, these
sensors can be set to the customers specifications
prior to mounting the gas sensor in the engine room or
refrigerated area.
Relay and Horn Set Point
The adjustment screw A sets the trip point for the relay
and the alarm horn. A 0-5V scale measures the full sensing
range of the Gas Sensor. The trip point voltage can be
measured at points ØV and REF1 located on the board.
Refer to pages 6 and 7 for location of the reference pin
REF1. A 100 PPM range gas sensor reading 2.5 volts at
the reference pin would be equivalent to half the range
or 50 PPM. Default factory setting is 50% of range.
Note that the set point of the relay is independent
of the set points to the Gas Detection Monitor. To
assist in selecting the correct voltage for the desired
PPM set point, refer to Table 1 below.
VOLTAGE PPM RANGE
5 100 250 500 3000 10,000
4 80 200 400 2400 8000
3 60 150 300 1800 6000
2 40 100 200 1200 4000
1 20 50 100 600 2000
.5 10 25 50 300 1000
TABLE 1
Setting Minimum or Maximum Relay Set Point
There is a practical limit for setting the minimum or
maximum relay set point. There is the tolerance of the
electronic board and the test meter. It is recommended
to keep the relay set point between 10% and 95% of
the range.
Time Delay
A time delay for the operation of the relay and alarm horn
can be selected using jumpers JP5 and JP6. Default
factory setting is zero.
Alarm Horn
Alarm horn is 40dB at 2 feet for Basic Sensor; all other
models not audible with cover closed. The alarm horn
can be disabled using jumper JP2. Default factory
setting is enabled.
Adjustment of the Detection Range
Adjustment Screw Z sets the zero (0 PPM) and Adjustment
Screw S sets the span. (full range = 1000PPM, for
instance). The output of the sensor circuit can be
monitored via test points ØV and VS. The full range
equals 5 volts DC. See Calibration Procedures for
further details.
GAS SENSOR OPERATION
On power up the internal relay will energize switching
from the normally closed position to the normally open
position. In addition, the sensor will go through an
initial warm-up delay for five minutes. At this time, the
I and V outputs are 0. This is indicated by the green
LED flashing approximately every second. After five
minutes, the green LED stays on continuously, indicating
power to the gas sensor and ready for service. The gas
sensor also sends a milliamp output signal to the gas
detection monitor, PLC, or computer. This output signal
is proportional to the amount of the specific gas being
monitored in the air around the gas sensor. If signal
reads 0.5mA, it is an indication the sensing element has
failed or disconnected. Verify proper installation and
refer to testing and calibration procedures.
Fail Safe Operation
Hansen Gas Sensors feature a one amp SPDT alarm
relay for fail safe operation. In the event of a sensor
element failure, power loss or gas leak detection, the
internal relay will be de-energized. This relay can be
used to trigger an external alarm.
Start Up Test
Once the installation of the gas sensors and monitors
is complete, the entire gas sensor system should be
tested. Normally, two people are required—one person
using a small amount of the target gas to “bump” each
sensor in turn, a second person at the monitor location
to verify the sensor is connected to the correct input,
responds to the target gas and causes the lights and
alarms to respond.
Gas Sensor Testing
Field testing of the gas sensor is normally done for three
reasons. The first is to determine if the gas sensor is
responding to the specific gas. This test is sometimes
called a “bump” test. The frequency of the test is usually
stated in the facilities Process Safety Management (PSM)
document, but not less than every six months.
The second reason for gas sensor testing is to be sure
the gas sensor is properly calibrated. Depending on the
sensing element type, the sensor sensitivity will change
with time. In particular, electrochemical sensors use a
material that is depleted with time. The length of time
varies depending on the amount of exposure to the target
gas, the ambient temperature and humidity, and changes
to temperature and humidity range. Atmospheres that
are very dry or very humid will shorten the life of a
sensing element.
The third reason is to be sure the gas sensor output
triggers the alarms on the monitor, PLC, Gas Alert System,
horn or lights. Gas sensors should be recalibrated at
least once a year or sooner where the gas sensor is
frequently exposed to low concentrations of the target
gas. Semiconductor and infrared sensors should be
checked annually. All sensor types should be recalibrated
immediately after exposure to a large concentration of
the target gas.
Note: Insurance companies, local and state agencies
may require more frequent testing and calibration;
refer to insurance carrier mandates as well as local
and state codes.
Calibration of Electrochemical Sensors
Read the calibration instructions completely before
proceeding. If in doubt about a procedure, please
contact Hansen Technologies for further assistance.

9A100b
JAN 2009
LED LOGIC
GAS SENSOR LED INDICATORS
LED OPERATIONS RESULT
Green LED Flashing / Red LED off Warming up ≈ 5 min
Green LED on / Red LED off Ready to detect gas
Green LED on / Red LED on Gas level above gas
sensor trip point
Green LED off / Red LED on
Sensor element
failure or sensor
disconnected
Green LED off / Red LED flashing Low supply voltage or
low supply current
CALIBRATION PROCEDURES
Refer to Fig. E for calibration of Hansen sensors.
Equipment required:
Hansen calibration kit, stopwatch, hex wrench; 5/32˝,
long nose pliers, 24V AC/DC power supply, voltmeter,
2 minigrabber voltmeter leads and calibration gas for
the specific sensor.
Setup:
Be sure the system is made safe during1.
calibration. The 4-20mA output and internal relay
will be active during calibration.
Be sure the gas sensor has been powered up2.
for a minimum 24 hours to stabilize the sensing
element.
Verify the green LED is illuminated and the red3.
LED is off.
Disable the internal horn by removing JP2 jumper.4.
Zero Calibration:
Set the voltmeter to the appropriate DC range. The5.
sensor element output is measured in DC volts;
zero volts equals zero PPM and 5 volts equals the
gas sensor PPM rating. (i.e. 100PPM, 250PPM).
Attach the voltmeter leads to the VS, (+) lead from
the voltmeter, V0, (-) lead of the voltmeter.
Be sure the ambient atmosphere around the gas6.
sensor is free of the target gas.
Adjust the zero potentiometer (Z) until the voltage7.
reading on the voltmeter reads between zero
volts and +/- 0.090VDC.
Span Calibration:
Always perform the zero calibration before doing1.
the span calibration.
Place the boot over the sensor element. Use2.
the correct concentration of calibration gas for
the full range of the sensor. In other word, for a
gas sensor with a range of 0 to 250 PPM, use a
250 PPM calibration gas when setting the span.
If full range calibration gas is not available, a
calibration gas of less than full range can be used
then adjust to the corresponding output voltage.
This may result in some loss of accuracy.
3a. Gas sensors (except Vent line).
Start the flow of gas. Observe the output, it
should begin to increase after 5 seconds. Leave
the gas flow on and observe the voltage. The
sensor voltage will slowly climb toward 5VDC.
When the voltage does not change by more than
+/- 0.010 volts per 15 seconds the sensor output
voltage is considered to be stable. Adjust the
span potentiometer (S) so the output voltage
reads between 4.95 to 5.00 volts DC.
3b. Vent line gas sensors.
Start the flow of gas. Observe the output, it
should begin to increase after 5 seconds. Leave
the gas flow on and observe the voltage. The
sensor voltage will ramp up very quickly crest
then decrease quickly. At this point, adjust the
span potentiometer (S) so the output reads
between 4.95 to 5.00 volts DC.
4. Stop the flow of gas and remove the boot from the
sensor element. Verify the sensor voltage output
begins to decrease.
5. Do not attempt to re-adjust the zero or span
calibration until another 24 hours of powered
operation has passed.
6. Enable system. Verify proper operation.
7. Enable the internal horn by installing JP2 jumper.
Electrochemical Sensor Only (Zero Offset)
If the gas sensor is calibrated in the environment for
which it will be used a final zero adjustment will not be
necessary. If the gas sensor will be calibrated at one
temperature (70ºF, 21ºC) then moved to its operating
environment (-4ºF, -20ºC) a maximum zero offset of 2%
will occur. If unacceptable, adjust the zero point as
described in section Calibration Procedures, Zero
Calibration. At (-40ºF, -40ºC), a maximum zero offset
of 12% will occur. If unacceptable, adjust the zero point
as described in section Calibration Procedures, Zero
Calibration.
CALIBRATION GAS CYLINDERS
Warning: Refer to Material Safety Sheet supplied with
gas cylinder and local safety precautions for proper
usage, handling and disposal.
Hansen calibration gas standards are traceable to NIST
(National Institute of Standards and Technology) and
analysis data is available on request.
A variety of calibration refrigerant gases and PPM ranges
are available, refer to Page 19. For special mixtures,
consult factory. Calibration gas should be stored in a
cool area, 65ºF/75ºF. Shelf life labeled on cylinder−one
year from date of manufacture.
Calibration gas must be shipped according to Department
of Transportation Hazardous Gas Regulations. Special
shipping charges will apply. Shipping only available in
the continental USA. For shipments outside the USA,
consult Hansen for local distributors.

10
A100b
JAN 2009
CALIBRATION OF SENSORS
FIG. E
HORN
S
Z
12345678
ELECTRO CHEMICAL BOARD SHOWN
(SEMI CONDUCTOR IS SIMILAR)
ZERO POT
ADJUSTMENT
SPAN POT
ADJUSTMENT
SENSING
ELEMENT
0-5V DC
O V
V S
REGULATING
VALVE
CALIBRATION GAS
BOOT
SENSING ELEMENT REPLACEMENT
Basic Sensors
The Basic Gas Sensor uses a three pin plug-in element
for Ammonia Sensors and six pin plug-in element for
Halocarbon Sensors which is internally mounted to the
circuit board. To replace, disconnect power and open
the enclosure. The sensing element is removed by hand;
lifting it off the circuit board. Install the new sensor
element by lining up the pins and press firmly into place.
Connect power and allow the sensor element to stabilize
for 24 hours. Recalibrate and install the cover. Note:
Infrared sensing element (CO2) is not replaceable.
Standard, Harsh and Explosion Proof Sensors
Standard, Harsh and Explosion Proof Sensing Elements
are externally mounted to the enclosure. To replace,
disconnect power, open enclosure and disconnect cable
wire from the circuit board. Unscrew sensor element
from enclosure. Install new sensor element. Connect
power and allow sensor element to stabilize for 24 hours.
Recalibrate and install the cover.
Extreme Sensors
Extreme Sensing Elements are internally mounted to
the enclosure. To replace, disconnect power, remove
nut and gasket from sensing element at the base of the
unit, open enclosure and disconnect cable wire from the
circuit board. Remove sensor element from enclosure.
Install new sensor element in reverse order. Connect
power and allow sensor element to stabilize for 24 hours.
Recalibrate and install the cover.

11 A100b
JAN 2009
HLM6 - Six Channel Monitor HLM2 - Two Channel Monitor
KEY FEATURES–MONITORS
120 or 230V AC power•
Audible alarm•
Visual power indicator•
(2) alarm and (1) fault relay outputs - Model HLM6•
(2) alarm relay outputs - Model HLM2•
CE approved•
TYPICAL SPECIFICATIONS
Two Level Monitors: Model HLM2 and Model HLM6
Low-level Alarm:
- Visual Warning Yellow LED
- Audible Warning Intermittent
- Relay SPDT Energized
High level alarm:
- Visual Warning Red LED
- Audible Warning Continuous
- Relay SPDT Energized
The Model HLM2 two channel monitor has the alarm
built in.
The Model HLM6 six channel monitor has an externally
mounted horn. A device rated up to 12V DC at 100mA
maximum may be connected to CN11, see Fig. G. The
high level SPDT relay may be set for Normal Operation
(normally closed position with no power) or Fail-Safe
Operation (relay energized when power to monitor is
applied). The Fail-Safe Operation is initialized by setting
Jumper JP1 over pins 2 and 3.
Low level alarms reset automatically when the detected
gas dissipates. High level alarm condition requires a
manual reset (user to press the reset button on the
topside of the monitor). Please note that a high level
alarm condition can only be reset 30-60 seconds after
the gas clears from the sensor.
The audible alarm produced by the horn may be disabled
by turning the key switch off. The key switch is located
on the topside of the monitor.
TECHNICAL SPECIFICATIONS–MONITORS
Operating Temperature Range: 32ºF (0ºC) to
125ºF (50ºC)
Output: 2 SPDT dry contact relays (alarms) - 10 amp
@ 230V AC
1 SPDT dry contact relay (fault output) - 10 amp @
230V AC (HLM6 Model only)
Power Required: 120V AC (230V AC available)
Power Consumption:
300mA @ 120V AC, 50/60 Hz (HLM6)
150mA @ 230V AC, 50/60 Hz (HLM6)
100mA @ 120V AC, 50/60 Hz (HLM2)
50 mA @ 230V AC, 50/60 Hz (HLM2)
Audible Alarm:
HLM2 - internal 80 dB,
HLM6 - external 110 dB/12V DC
INSTALLATION INSTRUCTIONS
The Hansen Technologies Gas Detection Monitor should
be located in an accessible area, away from moving
equipment that could accidentally come in contact with
the unit. Avoid thermal extremes (close to heaters).
Monitor must be protected from direct strong drafts/
airflows and areas where falling water or condensing
moisture is present.
WIRING OF GAS DETECTION MONITORS
Install the Hansen Gas Detection Monitor on a wall or in
an electrical panel in an area where operating personnel
will easily monitor the leak detection system. There are
three mounting holes on the back of the panel. Remove
the front cover and disconnect the grounding wire to
access the mounting holes. Attach the monitor to the
wall using the appropriate mounting screws.
Hansen Gas Detection Monitors are available for use
with two or six sensors. For larger systems, use multiple
Gas Detection Monitors. Alternately, the gas sensors
can be used directly with a customer supplied computer
or PLC and software.
Connect specified AC power to the Gas Detection
Monitor. Size the circuit for a minimum 5 amps for 120V
or 2 amps for 230V. Use two wire plus ground with
minimum 18 gauge wire (.823mm sq.) for 120V service
or .75mm sq. wire for 230V service. Bring power into
the bottom of the enclosure. Seal any excess conduit or
cable entries. See page 13 for terminal connections.
Extreme Gas Sensor requires an additional external
24V AC or DC power supply. Refer to Fig. K for wiring
details.

12
A100b
JAN 2009
Maximum Power Wiring Length to a Monitor
120V
System
230V
System Wire
Size
Maximum
Ohms/Wire
Length Length
Ft m Ft m
HLM2
200 60.9 120 40 22 Gauge
7/.2mm 3.52
500 150 300 100 18 Gauge
7/.386mm
HLM6
500 150 300 100 22 Gauge
7/.2mm 8.8
1300 430 700 230 18 Gauge
7/.386mm
TABLE 2
Note: There is a 5 minute delay before the green power light
on the gas monitor is energized. This is to allow the Gas
Sensor to stabilize and not give off false information.
The Hansen models HLM2 and HLM6 have both low
level alarm and high level alarm single pole double
throw (SPDT) relays. HLM2 low level alarm relay is on
the CN5 terminal and the high level alarm relay is on
the CN4 terminal.
The Hansen model HLM6 has the low level alarm on CN10
terminal and the high level alarm on CN9 terminal. In
addition, model HLM6 has a fault output on CN12.
The HLM6 includes two additional outputs on terminal
block CN11. CN11 (+12V and BUZZ) are used to drive an
external alarm horn (included). CN11 (+12V and 0V) is
an uncommitted, fuse (FS8) protected, voltage output
(12V DC@100mA) available to power external relays,
etc. It may be used in conjunction with the low level,
high level and/or fault output to provide a switched 12V
DC output.
In addition to the power line fuses or circuit breakers,
each monitor has an internal power line fuse. The fuse
rating is listed in Table 3 below.
MONITOR 120V AC 230V AC
HLM2 100mA 50mA
HLM6 315mA 160mA
TABLE 3
RELAY SET POINTS FOR GAS DETECTION
MONITORS
Gas Detection Monitors are equipped with two relays—
low level and high level. Shipped from the factory, the
relays are set for 20% and 60% of the output of the
sensor. In other words, a 250 PPM sensor will activate
the low level alarm at 50 PPM and the high level alarm
at 150 PPM. The relay settings can be field adjusted.
Refer to page 13 for details.
CALIBRATING HLM6 MONITOR
Use a voltmeter to monitor the voltage on the calibration
pins. The voltage range is from 0.4V DC to 2.0V DC.
The voltage range corresponds to the 4-20mA range.
(ie. 0.4V DC equals 4mA, 2.0V DC equals 20mA).
For the low level alarm relay setting, measure the voltage
across Calibration Pins 2 and 4. Set the desired low
level alarm relay using the Low Level Alarm Pot which
is located closest to the calibration pins. This setting
applies to the six channels.
For the high level alarm relay setting, measure the voltage
across Calibration Pins 1 and 4. Set the desired high
level alarm relay using the High Level Alarm Pot which is
located furthest from the calibration pins. This setting
applies to the six channels.
CALIBRATING HLM2 MONITOR
Use a voltmeter to monitor the voltage on the calibration
pins. The voltage range is from 0.4 V DC to 2.0V DC.
The voltage range corresponds to the 4-20mA range.
(i.e. 0.4V DC equals 4mA, 2.0V DC equals 20mA).
For the low level alarm relay setting, measure the voltage
across Calibration Pins 2 and 4. Set the desired low
level alarm relay using the Low Level Alarm Pot which
is located closest to the calibration pins. This setting
applies to both channels.
For the high level alarm relay setting, measure the voltage
across Calibration Pins 1 and 4. Set the desired high
level alarm relay using the High Level Alarm Pot which is
located furthest from the calibration pins. This setting
applies to both channels.
HLM6/HLM2 RELAY OPERATION
EVENT
LOW
LEVEL
RELAY
HIGH
LEVEL
RELAY
FAULT
RELAY
(CN12)
No Power *
Fail Safe ON (No Alarms)
Fail Safe ON (Low Level Alarming)
Fail Safe ON (High Level Alarming)
Fail Safe ON (Low & High Level Alarming)
Fail Safe OFF (No Alarms)
Fail Safe OFF (Low Level Alarming)
Fail Safe OFF (High Level Alarming)
Fail Safe OFF (Low & High Level Alarming)
= Relay Energized
* Fault Relay (CN12) normally open contacts are closed with
no power.
The High Level Relay (CN9) is the only relay linked to the Fail
Safe. Fault Relay (CN12) only available on the HLM6. Use Fail
Safe OFF events for HLM2.
There is a 5 minute delay before the green Power LED on the
monitor is energized. During the delay, if the input current to
any channel is less than 0.9mA the High Alarm LED and the
Fault Output Relay (HLM6 only) will be energized.
(HLM6) After the delay, if the input current to any channel is
less than 0.9mA
Fail Safe jumper “ON”: High Level Relay energized
Fail Safe Relay energized
High Level Alarm LED energized
Audio output not active
Fail Safe jumper “OFF”: High Level Alarm LED energized
Fail Safe Relay energized
Audio output not active
(HLM2) After the delay, if the input current to any channel is
less than 0.9mA the High Level Alarm LED is energized and no
audio output.

13 A100b
JAN 2009
HLM2 WIRING DIAGRAM
FIG. F
HLM6 WIRING DIAGRAM
FIG. G
Channel 2
Channel 1
1
2
3
4
1
2
3
4
CN2
CN1
NC
C
NO
CN4
FUSE
GAS LEAK MONITOR
NO
E
L
N
NC
C
HIGH
LEVEL
ALARM
LOW
LEVEL
ALARM
GREEN RED
REMOTE SENSOR
V+V VINO
COM NC
0
0
HORN
V
*Remove Resistor when connecting a sensor
*
LINE VOLTAGE
1234
LOW LEVEL ALARM POT
HIGH LEVEL
A
LARM POT CALIBRATION
PINS
120V: GMC-100mA 250V
230V: S506-50mA 250V
MULTI-WIRE
SHIELD
Value: 3.3K OHM
CN5
G
Y
R
Y
R
POWER ON
LIGHT
A
D
POWER
IN
GREEN RED
REMOTE SENSOR
V+V VINOCOM
NC
0
0
HORN
- LINE
- GROUND
- NEUTRAL
+12V
BUZZ
0 V
CN11
FAIL
SAFE
OFF ON
FUSE
CAL
L
N
G YRYRYR YRYR RY
CN1
1
2
3
4
CN2
1
2
3
4
CN3
1
2
3
4
CN4
1
2
3
4
CN5
1
2
3
4
CN6
1
2
3
4
FUSE FUSE FUSE FUSE FUSE FUSE
N/0
N/C
N/0
N/C
COM
N/0
N/C
COM
COM
CN10
CN9
CN12
POWER ON LIGHT
MODEL HLM6
V
*Remove Resistor when connecting a sensor
*****
1234
LOW LEVEL ALARM POT
(TYPICAL)
CALIBRATION PINS
HIGH LEVEL ALARM POT
LOW LEVEL
ALARM
HIGH LEVEL
ALARM
FAULT OUT PUT
CABLE SHIELD
FUSE
GMC-200mA 250V
120V: GMC-315mA 250V
230V: GMC-160mA 250V
120V/230V: GMC-315mA 25
0
(shield connected to case)
Value: 3.3K ohm
1
12-24V DC output (typ)
Channel 1 - 6 pins 1 & 4
A
D

14
A100b
JAN 2009
TROUBLESHOOTING GAS MONITORS
Symptom: No lights displayed on panel.
Cause:
Power failure. Check incoming line.1.
Tripped circuit breaker or blown fuse on electrical2.
supply.
Unit warming up. It takes 3-5 minutes after power3.
is switched on.
Symptom: Red light is on, but no alarm condition
is active. (i.e. No horn or no relay operation after 3
minutes).
Cause:
Check to be sure the horn has not been1.
deactivated by Key switch.
Possible wiring or sensor fault. Check wiring and2.
connections for continuity.
Check calibration for proper alarm levels.3.
Resistor missing from unused sensor channel.4.
Install 3.3K ohm resistor across terminal 1 and 2.
TROUBLESHOOTING GAS SENSORS
Symptom: Sensor green light is off.
Cause:
Possible wiring fault between controller and1.
sensor. Check power supply to Controller. Check
connections between the controller and the
sensor. Check wires are connected to the proper
number terminal.
On HLM6 monitor, check the fuse corresponding2.
to the particular sensor.
Sensor possibly damaged. Check by installing3.
another sensor to confirm sensor fault.
Symptom: Output from sensor is 0.5mA (for 4-20mA
output). Output from sensor is 0 V or .5V (for 0-10, 0-5,
1-10, 1-5 output signals).
Cause:
Sensing element is disconnected from printed1.
circuit board.
Sensing element failed.2.
Check: Check wiring and check sensor element for
proper installation.

15 A100b
JAN 2009
INSTALLATION DIMENSIONS
INCHES (MM)
HLM2
HLM6
GAS ALERT SYSTEM
7.39
(188)
6.30
(160)
.38
(9.6)
5.94
(151)
6.54
(166)
1.06
(27)
1.125
(28)
1.16
(29.5)
1.06
(27)
3xM20 M16/PG9
5.26"
(134)
2.72"
(69)
6.30"
(160)
2.56
(65)
.62
(16)
2.07
(53)
4.13
(105)
.173 DIA (4,4)
MOUNTING HOLE
3 PLACES
.29
(7)
2.93
(78)
6.37
(162)
.358 DIA (9,1)
MOUNTING HOLE
3.10
(79)
7.58
(191)
.49 DIA (5X)
(12)
AUDIBLE ALARM
KEY SWITCH
HIGH LEVEL
ALARM RESET
.173 DIA (4,4)
MOUNTING HOLE
3 PLACES
.358 DIA (9,1)
MOUNTING HOLE
9.50
(241)
10.38
(264)
5.19
(132)
.56
(14)
.29
(7)
8.58
(218)
9.56
(243)
3.30
(84) 2.80
(71)
HIGH LEVEL
ALARM RESET
AUDIBLE ALARM
KEY SWITCH
.49 DIA (5X)
(12)

16
A100b
JAN 2009
KEY FEATURES−GAS ALERT SYSTEM
Provides local display and alarm based on•
measured target gas level
Visual alarm, Amber LED light•
Audible alarm (mutable)•
Power indicator, Green•
Numeric PPM reading•
Bright LED display•
Shipped factory calibrated and tested•
TECHNICAL SPECIFICATIONS
Operating Temperature Range: -10ºF (-23ºC) to
125ºF (50ºC)
Humidity Range (Non-condensing): 0-95%
Voltage Requirements: 24V AC/DC, 50/60 Hz
Display: LED, Red
Loop Resistance: 100 ohms
Power Requirements at 24V AC, 50/60Hz with sensor:
11.4VA
Power Requirements at 24V DC with sensor: 247mA
Audible Alarm Sound Pressure: 97dB at 2 feet
Tone Type: Continuous, 2900 Hz
Muted Sound Pressure: 60dB at 2 feet
Visual Alarm, LED Lamp: Amber, 38 lumens
Enclosure: Watertight, NEMA4X (IP65)
INSTALLATION OF GAS ALERT SYSTEM
The GAS Alert System is shipped factory calibrated and
tested; ready to use. Mount in a location safe and easily
accessible. Avoid thermal extremes and areas where
falling water or condensation moisture is present.
The GAS Alert System can be mounted to any solid flat
surface. Two options are available for mounting; screw
the base to a solid flat surface or clip-on to a DIN-rail.
The lower cover must be removed to access the two
mounting holes for screw mounting. Attach to the wall
with the appropriate mounting screws. Replace the
cover when complete.
WIRING GAS ALERT SYSTEM
The GAS Alert System can be used as a standalone,
locally monitored system or as part of a larger gas
monitoring and signaling system. The lower cover to
the terminal compartment must be removed to gain
access for wiring. Knockouts are available for ¼˝ and
½˝ conduit or liquid tight cable clamps. To use as a
standalone system one gas sensor is required. The
gas sensor is powered via the GAS Alert System. The
gas sensor 4-20mA signal is fed back to the GAS Alert
System to allow for a numeric readout of the actual
PPM value measured. The gas sensor internal relay is
wired to the GAS Alert System to trigger the signaling
lamp and sounder. The GAS Alert System signal lamp
and sounder will clear when the gas level as detected
by the gas sensor drops below the adjusted trip point.
The default setting from the factory for a specified gas
sensor is half the total range. For typical wiring refer
to page 17.
To use as part of a larger gas monitoring and signaling
system, each GAS Alert System will be mated with a
gas sensor. The 4-20mA signal can be used to drive
the GAS Alert System device, plus a larger monitoring
system or PLC monitoring signaling system. For typical
wiring refer to Fig. I.
GAS Alert System

17 A100b
JAN 2009
GREEN RED
REMOTE SENSOR
V+V VINOCOM
NC
0
0 V
V
+V
I
COM
CONTROL
0
(RELAY NC) (RELAY COM) (SIGNAL) (POWER) (COM) (SHIELD)
(-)
(SIGNAL) (POWER) (POWER) (SHIELD)
(+)
ppm
Power Supply
24V AC/DC
EARTH GRD
Multi-Wire
Cable Shield
(-)
*
*JUMPER INSTALLED.
Do Not Ground
Shield At This End
Multi-Wire
Cable Shield
A
D
External Power Supply
GREEN RED
REMOTE SENSOR
V+V VINOCOMNC
0
0 V
V
+V
I
COM
CONTROL
0
(RELAY NC) (RELAY COM) (SIGNAL) (POWER) (POWER) (SHIELD)
(+)
(SIGNAL) (POWER) (POWER) (SHIELD)
(-)
ppm
Black
Red
White
Multi-Wire
Cable Shield
POWER
IN
HORN
- LINE
- GROUND
- NEUTRAL
+12V
BUZZ
0 V
CN11
FAIL
SAFE
OFF ON
FUSE
CAL
L
N
GYRYRYRYRYR RY
CN1
1
2
3
4
CN2
1
2
3
4
CN3
1
2
3
4
CN4
1
2
3
4
CN5
1
2
3
4
CN6
1
2
3
4
FUSE FUSE FUSE FUSE FUSE FUSE
N/0
N/C
N/0
N/C
COM
N/0
N/C
COM
COM
CN10
CN9
CN12
POWER ON LIGHT
MODEL HLM6
*Remove Resistor when connecting a sensor
*****
1234
LOW LEVEL ALARM POT
CALIBRATION
HIGH LEVEL ALARM POT
LOW LEVEL
ALARM
HIGH LEVEL
ALARM
FAULT OUT PUT
FUSE
GMC-200mA 250V
120V: GMC-315mA 250V
230V: GMC-160mA 250V
120V/230V:
Valve: 3.3K ohm
PINS
Black
Red
White
GMC-315mA 250V
*
(-)
Power Source
24V AC/DC
EARTH GRD
Multi-Wire
Cable Shield
Do Not
Ground At
This End
Multi-Wire
Cable Shield
*JUMPER NOT INSTALLED.
SET REMOTE SENSOR FOR DC VOLTAGE
A
D
External Power Supply
TYPICAL WIRING DIAGRAM WITH LOCAL POWER SOURCE
FIG. H
TYPICAL WIRING DIAGRAM WITH HANSEN HLM6 MONITOR
FIG. I

18
A100b
JAN 2009
PLC 4 PT. ANALOG IN MODULE (CURRENT)
FIG. J
TYPICAL WIRING DIAGRAM HLM6 TO EXTREME GAS SENSOR
FIG. K
GREEN RED
V+V VINOCOMNC
0
0 V
Power Supply
24V AC/DC
EARTH GRD
Multi-Wire
Cable Shield
*REMOTE SENSOR
+
-
INPUT #1
INPUT #2
INPUT #3
INPUT #4
ANALOG GND
REMOTE SENSOR
REMOTE SENSOR
REMOTE SENSOR
* Wiring is the same for AC or DC Power Supply.
Voltage selector must match external power supply.
A
D
POWER
IN
GREEN RED
EXTREME GAS SENSOR
V+V VINOCOMNC
0
0
HORN
- LINE
- GROUND
- NEUTRAL
+12V
BUZZ
0 V
CN11
FAIL
SAFE
OFF ON
FUSE
CAL
L
N
GYRYRYRYRYR RY
CN1
1
2
3
4
CN2
1
2
3
4
CN3
1
2
3
4
CN4
1
2
3
4
CN5
1
2
3
4
CN6
1
2
3
4
FUSE FUSE FUSE FUSE FUSE FUSE
N/0
N/C
N/0
N/C
COM
N/0
N/C
COM
COM
CN10
CN9
CN12
POWER ON LIGHT
MODEL HLM6
V
*Remove Resistor when connecting a senso
r
*** *
1234
LOW LEVEL ALARM POT
CALIBRATION PINS
HIGH LEVEL ALARM POT
LOW LEVEL
ALARM
HIGH LEVEL
ALARM
FAULT OUT PUT
FUSE
GMC-200mA 250V
120V: GMC-315mA 250V
230V: GMC-160mA 250V
120V/230V: GMC-315mA 250V
Valve: 3.3K ohm
1
Power Supply
24V AC/DC
EARTH GRD Multi-Wire
Cable Shield
18 AWG.
GREEN RED
V+V VINOCOMNC
0
0 V
Multi-Wire
Cable Shield
* Wiring is the same for AC or DC power supply.
Voltage selector must match external power supply. A
D
A
D
External Power Supply Voltage Selector

19 A100b
JAN 2009
ORDERING INFORMATION: GAS DETECTION SENSORS & MONITORS
AMMONIA Sensor Type Range (PPM)
Standard to 0ºF(-17ºC) Harsh to -40ºF(-40ºC) Extreme to -60ºF(-51ºC)
HEC4-N100 HEC4H-N100 HEC4E-N100 Electrochemical 0-100
HEC4-N250 HEC4H-N250 HEC4E-N250 Electrochemical 0-250
HEC4-N1K HEC4H-N1K HEC4E-N1K Electrochemical 0-1,000
HSC4-N10K HSC4H-N10K HSC4E-N10K Semiconductor 0-10,000
Note: For Explosion Proof model, substitute X for 4 in model number (i.e. HECX-N100).
VENT LINE Sensor Type Range (PPM)
Standard to -40ºF(-40ºC) Refrigerant
HVSC4-F5K* Halocarbon Semiconductor 0-5,000
HVSC4-N10K Ammonia Semiconductor 0-10,000
* Specify refrigerant (R22, R507, R134a, R404, R410).
HALOCARBON Sensor Type Range (PPM)
Basic to 32ºF(0ºC) Harsh to -40ºF(-40ºC) Extreme to -60ºF(-51ºC)
HSC1-F3K/R22 HSC4H-F3K/R22 HSC4E-F3K/R22 Semiconductor 0-3,000
HSC1-F3K/R507 HSC4H-F3K/R507 HSC4E-F3K/R507 Semiconductor 0-3,000
HSC1-F3K/R134a HSC4H-F3K/R134a HSC4E-F3K/R134a Semiconductor 0-3,000
HSC1-F3K/R404 HSC4H-F3K/R404 HSC4E-F3K/R404 Semiconductor 0-3,000
HSC1-F3K/R410 HSC4H-F3K/R410 HSC4E-F3K/R410 Semiconductor 0-3,000
Note: Gas Sensors available for additional refrigerants; consult factory.
CO2Sensor Type Range (PPM)
Basic to 32ºF(0ºC) Harsh to -40ºF(-40ºC) Extreme to -60ºF(-50ºC)
HIR1-C10K HIR4H-C10K HIR4E-C10K Infrared 0-10,000
PORTABLE GAS DETECTION UNITS
Catalog No. Description
31-1010 Portable Gas Detector, Universal
Charger, 100-240V
31-1012 Sensor Module, NH3, 0-50/500 PPM
31-1013 Sensor Module, NH3, 0-500/2000 PPM
GAS ALERT SYSTEM
Catalog No. Range (PPM)
GAS-100 0-100
GAS-250 0-250
GAS-1K 0-1,000
GAS-3K 0-3,000
GAS-10K 0-10,000
GAS DETECTION MONITORS
Catalog No. Description
HLM2 Two Channels; internal audible alarm
HLM6 Six Channels; external audible alarm
Note: Specify voltage 120V AC or 220V AC.
CALIBRATION GAS CYLINDERS
Refrigerant Gas Range (PPM) Catalog No.
Ammonia 100 31-0031
Ammonia 250 31-0032
Ammonia 1,000 31-0033
Ammonia 10,000 31-0034
CO210,000 31-0127
R22 3,000 31-0078
R22 5,000 31-0123
R404/R507 3,000 31-0079
R404/R507 5,000 31-0126
R134a 3,000 31-0080
R134a 5,000 31-0124
R401a 3,000 31-0081
R402a 3,000 31-0082
R410 5,000 31-0130
GAS SENSOR ACCESSORIES
Catalog No. Description
31-1000 Sensor Calibration Kit
31-1001 Quick Disconnect Plug Kit
31-1002 Sensor Element Shield

20
A100b
JAN 2009
Hansen Technologies Corporation
6827 High Grove Boulevard
Burr Ridge, Illinois 60527 USA
Tel: [phone] Fax: [phone] Toll: 800.426.7368
Email: [email protected] Web: www.hantech.com
USA ∙Asia ∙Europe ∙India ∙Latin America ∙Middle East
© 2009 Hansen Technologies Corporation
CAUTION
Hansen Gas Detection Sensors, Monitors and Alert
Systems have been designed for refrigeration systems.
These instructions must be completely read and
understood before selecting, using or servicing Hansen
valves. Only knowledgeable, trained refrigeration
mechanics should install, operate, or service these valves.
Stated temperature and pressure limits should not be
exceeded. Bonnets, solenoid tubes, etc. should not be
removed from valves unless system has been evacuated
to zero pressure. Must also see Safety Precautions in
current List Price Bulletin and Safety Precautions Sheet
supplied with product.
WARRANTY
All Hansen products, except electronics, are guaranteed
against defective materials or workmanship for one
year F.O.B. factory. Electronics are guaranteed against
defective materials or workmanship for 90 days F.O.B.
factory. No consequential damages or field labor is
included.
ORDERING INFORMATION: GAS DETECTION ACCESSORIES
SENSING ELEMENT REPLACEMENT KITS
Kit No. Sensing Element For Gas Sensor (PPM) Type
31-1003 Standard, Ammonia 100, 250, 1000 Electrochemical
31-1004 Standard, Ammonia 10,000 Semiconductor
31-1005 Harsh/Extreme, Ammonia 100, 250, 1000 Electrochemical
31-1006 Harsh/Extreme, Ammonia 10,000 Semiconductor
31-1007 Vent Line, Ammonia 10,000 Semiconductor
31-1008 Basic, Halocarbon 3000 Semiconductor
31-1009 Harsh/Extreme, Halocarbon 3000 Semiconductor
31-1015 Vent Line, Halocarbon 5000 Semiconductor
31-1016 Explosion Proof, Ammonia 10,000 Semiconductor
31-1017 Explosion Proof, Halocarbon 3000 Semiconductor
31-1018 Explosion Proof, Ammonia 100, 250, 1000 Electrochemical
31-1019* Ammonia 100, 250, 1000 Electrochemical
31-1020* Ammonia 10,000 Semiconductor
* Board mounted sensing element for obsolete standard gas sensor.