Macurco HD-11 User Manual

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• This detector helps monitor for the presence and concentration level of

to work with control panel or other building management equipment

• VOLTAGE: 12 to 24 VAC or VDC

• CURRENT (non-alarm): 45 ma @ 12 VDC, 22 ma @ 24

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acurco™ HD-11 Hydrogen Gas Detector

ser Instructions

Important: Keep these User Instructions for reference

ENERAL SAFETY INFORMATION

NTENDED USE

he Macurco Hydrogen Gas Detector HD-11 is a low voltage (12­4VAC or VDC) electronic detector of hydrogen gas. The HD-11 is
esigned for connection to alarm control panels. Alarm control panels

hat work on 12 or 24 VDC can provide battery backup to the HD-11.

his gas detector is NOT designed to detect smoke, fire or carbon

onoxide.

IST OF WARNINGS AND CAUTIONS

! WARNING

Each person using this equipment must read and understand the

information in these User Instructions before use. Use of this
equipment by untrained or unqualified persons, or use that is not in
accordance with these User Instructions, may adversely affect product
performance and result in sickness or death.

Use only for monitoring the gas which the sensor and detector are

designed to monitor. Failure to do so may result in exposures to gases
not detectable and cause sickness or death. For proper use, see
supervisor or User Instructions, or call Macurco Technical Service.

HD-11 may not function effectively below 32 °F or above 120°F. Using

the detector outside of this temperature range may adversely affect
product performance and result in sickness or death.

certain specified airborne gases. Misuse may produce an inaccurate
reading, which means that higher levels of the gas being monitored
may be present and could result in overexposure and cause sickness
or death. For proper use, see supervisor or User Instructions, or call
Macurco Technical Service.

• The HD-11 is not designed to measure compliance with Occupational
Safety and Health Administratio
standards.

• When the unit is powered up it performs a self-test during which the
green LED light will blink for a period of one and one half to two
minutes. Afterward, the green LED light will turn on continuously to
indicate the unit is in normal operation (ARMED). If the self-test fails or
the green LED light does not turn on continuously do not use. Failure
to do so may adversely affect product performance and result in
sickness or death.

• Immediately exit the environment if there is an alarm condition on the
detector. Failure to do so may result in sickness or death.

• This detector will only indicate the presence of Hydrogen gas at the
sensor. Hydrogen gas may be present in other areas. Accommodation
spaces should be well ventilated when household
similar contaminants are used.

• Do not cover or obstruct visual alarm LED. Doing so may adversely
affect product performance and result in sickness or death.

• Do not disassemble unit or attempt to repair or modify any component
of this detector. This detector contains no user serviceable parts, and
substitution of components may adversely affect product performance
and re

sult in sickness or death.

CAUTION

• Avoid the use of harsh cleaning materials, abrasives and other organic

solvents. Such materials may permanently scratch the surfaces; damage
the sensor, labels, or instrument housing.

• If you have any doubts about the applicability of the equipment to your job

situation, consult an industrial hygienist or call Macurco Technical Service.

n (OSHA) commercial or industrial

cleaning supplies or

USE INSTRUCTIONS AND LIMITATIONS

! WARNING

Each person using this equipment must read and understand the
information in these User Instructions before use. Use of this equipment by
untrained or unqualified persons, or use that is not in accordance with these

User Instructions, may adversely affect product performance and result in
sickness or death.

USE FOR

The Macurco Hydrogen Gas Detector HD-11 is a low voltage (12­24VAC o

r VDC) dual relay, hydrogen detector. The unit is designed

to help monitor levels of hydrogen gas in a room or a facility where
hydrogen gas may be present, for example where forklifts, backup
power supplies, or golf carts battery charging stations are present.

! WARNING

Use only for monitoring the gas which the sensor and detector are designed
to monitor. Failure to do so may result in exposures to gases not detectable
and cause sickness or death. For proper
Instructions, or call Macurco Technical Service.

use, see supervisor or User

DO NOT USE FOR

The Macurco Hydrogen Gas Detector HD-11 is NOT intended for use
in industrial applications such as refineries, chemical plants, etc. Do
NOT mount the HD-11 where the normal ambient temperature is
below 40ºF (4.4ºC) or above 120ºF (49ºC). The HD-11 mounts on a
4x4 or 2-gang electrical box supplied by the co

ntractor. DO NOT
install the HD-11 inside another enclosure or protective cover unless
it has good air flow through it. The HD-11 is NOT designed to detect
smoke, fire or carbon monoxide. Do NOT mount the HD-11 in a
corner.

! WARNING

HD-11 may not function effectively below 32 °F or above 120°F. Using the
detector outside of this temperature range may adversely affect product
performance and result in si

ckness or death.

GENERAL DESCRIPTION

The Macurco Hydrogen Gas Detector HD-11 is a low voltage (12­24VAC or VDC) electronic detector of hydrogen gas. The HD-11 is
designed for connection to alarm control panels to help monitor levels
of hydrogen gas. This gas detector is NOT designed to detect smoke,
fire or carbon monoxide.

FEATURES

• Detects Hydrogen Gas

• SPDT Alarm and N.C. Trouble Relays

• Ca

n Be Self-Restoring or Latching

• Electronic Sensors: No Maintenance or Recalibration

• Temperature Compensated

• Simple Installation and Operation

• Supervised Sensor

SPECIFICATIONS

• SIZE: 4 ½ X 5 X 1 5/8 inches

• SHIPPING WEIGHT: 0.54 pound

VDC, 65 ma @ 12 VAC, 45 ma @ 24 VAC

• CURRENT (in alarm): 70 ma @ 12 VDC, 35 ma @ 24 VDC,
100 ma @ 12 VAC, 65 ma @ 24 VAC

• COLOR: White

• SENSOR MAINTENANCE: Not required

• ALARM RELAY RATING: 0.125 AMPS, 40V, 3VA

• TROUBLE RELAY: 0.250 AMPS, 40V, 10VA

• OPERATING TEMPERATURE RANGE: 32° to 120° F

• ALARM SET POINT: 10% LEL HYDROGEN

INSTALLATION AND OPERATING INSTRUCTIONS

The following instructi

ons are intended to serve as a guideline for th
use of the Macurco HD-11 Hydrogen Gas Detector. It is not to b
considered all-inclusive, nor is it intended to replace the policy an
procedures for each facility.

! WARNING

This detector helps monitor for the presence and concentration level of
certain specified airborne gases. Misuse may produce an inaccurate
reading, which means that higher levels of the gas being monitored may b
present and could result in overexposure and cause sickness or death
For proper use, see supervisor or User Instructions, or call Macurc
Technical Service.

LOCATION

The Macurco Hydrogen Gas Detector HD-11 is NOT intended for us
in industrial applications such as refineries, chemical plants, etc. Th
unit can cover approximately 900 sq. ft. The coverage depends on ai
movement in the room or facility. Locate the unit high in the roo
where storage batteries are being charged, or where there may b
other hydrogen sources. Extra detectors may be needed near an
areas were people work or the air is stagnant.

! WARNING

The HD-11 is not designed to measure compliance with Occupational Safety
and Health Administration (OSHA) commercial or industrial standards.

INSTALLATION

1. Mount the HD-11 high on a wall about one foot down from th

ceiling. Use the same spacing as for smoke detectors- 30-foo
centers, 900 square feet per detector.

2. The three part plastic case allows the HD-11 to be either surface

mounted or installed over a four-inch square or double gang
electrical box, providing a near flush mount. The HD-11 snap on
front cover will need to be removed before installation. To

remove it, lightly pry the front cover off of the mounting plate

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operation (ARMED). If the self-test fails or the green LED light does not turn

on continuously do not use. Failure to do so may adversely affect product

should be well ventilated when household cleaning supplies or similar

CLEANING

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(middle section) with a coin or flat screwdriver inserted into the
vent at the bottom. The cover will snap off exposing the
electronics and mounting plate.

For flush mount, remove the 2 screws and rear cover from the

mounting plate and use the appropriate hole-pattern for
installation. The four holes toward the center of the mounting
plate match the hole- pattern of a double gang electrical box.
The four holes near the corners match the pattern of a four-inch
square box. Mount the HD-11 so the “TOP” marked side of the
mounting plate is at the highes

t side. Snap the front cover back
on when finished, making sure that the lights line up with the
access holes.

When using the HD-11 with normally closed initiating circuits,

use the Com. and N.C. alarm relay connections.

See wiring diagram and information below for connections of the

HD-11.

The HD-11 uses a full wave bridge rectifier at its power input, so

that it is independent of the polarity of the input power. It can
operate on DC or AC voltages between 12 and 24 volts.

A switching regulator is used to efficiently match the wide input

voltage range to the fixed, internal power system. As a result the
power consumption is fairly constant at about 0.75 watts in
normal operation, and 1.0 watt in alarm.

The alarm control panel zone inputs must be terminated with end

of line resistors (E.O.L.R.), which are provided with the panel.
The HD-11 does not have an internal audible sounder and must
be connected to an audible device that provides at least 85 DB
sound output.

TYPICAL CONNECTION OF TWO HD-11 TO AN ALARM CONTROL PANEL

HD-11

HD-11

TYPICAL COVERAGE - 900 SQUARE FEET

OWER UP

HD-11

! WARNING

hen the unit is powered up it performs a self-test during which the green

ED light blinks for a period of one and one half to two minutes. Afterwards,

he green LED light will turn on continuously to indicate the unit is in normal

performance and result in sickness or death.

When power is first applied to the detector, it will go through a warm­up period of one and one half to two minutes, during which alarms
are inhibited. The green LED light will turn on and off during the delay
period. The green light will turn on continuously (ARMED) afterwards
to indicate the unit is in normal operation.

OPERATION

1. Once the HD-11 is

operational (ARMED) the green light will be on
continuously. If gas is detected the red LED (ALARM) turns on and
the SPDT alarm relay activates to indicate the alarm condition.

2. In the configuration, as shipped from the factory, the HD-11 is self-
restoring. When the air clears of gas, the red light turns off and the
relay switches to its normal state. A jumper wire on the circuit board
can be c

lipped to allow the unit to latch in upon alarm. Once latched

in, power will need to be interrupted to un-latch the alarm condition.

• The HD-11 can be modified, either before or after installation, to
have a latching output. Pull off the cover and locate the jumper wire
labeled “CLIP FOR LATCH IN” on the printed circuit board in the
upper right hand side. Clip or cut this jumper wire and separate
wire ends. Now the unit will stay in alarm (once gas has exceeded
the pre-set threshold) until the power is interrupted. When replacing
the cover, make sure the lights line up with their access holes.

3. The HD-11 has a supervisory circuit of critical functions. A trouble
condition, due to failure of a non-reliable component, results in both
lights switching on and off and the normally closed

trouble relay

opening. A power failure also causes the trouble relay to open.

ALARMS

! WARNING

Immediately exit any environment if there is an alarm condition on the
detector. Failure to do so may result in sickness or death.

The final alarm is determined by the configuration of the control
panel, with the HD-11 only switching its relay to actuate the panel. Do
not connect the HD-11 to Fire Alarm Circuits

, or Burglar Alarm or
other signals. The illumination of the red (ALARM) light on the HD-11
indicates the alarm condition. When an alarm occurs immediately
evacuate the premises and seek assistance.

! WARNING

This detector will only indicate the presence of Hydrogen gas at the sensor.
Hydrogen gas may be present in other areas. Accommodation spaces

contaminants are used.

In addition to the hydrogen gas that it is designed to detect, the HD­11 can also be affected by a broad range of combustible gases.

Some of these that may cause an alarm are: alcohol, ammonia,
cleaning solvents, paint thinner, gasoline vapors, and aerosol
propellants. Aerosol cans such as hair spray usually contain a
combustible gas. Always make sure that there is adequate
when you use these products. Proper location will minimize alarms
due to normal use of household products.

TROUBLE INDICATOR

The trouble signal is determined mostly by the configuration of the
alarm panel, with the HD-11 trouble relay only providing an open
circuit for actuation. A failure of the gas-sensing element will result in
both lights turning on and off and the trouble relay op

ening. Failure of
power supplies in the HD-11 or a lack of power to the detector will
result in the trouble relay opening. The most common expected
trouble would be a break in the wiring between the panel and the HD-

11. When a trouble signal occurs call the alarm panel installer for
assistance.

the

! WARNING

Do not cover or obstruct visual alarm LED. Doing so may adversely affect
product performance and resul

t in sickness or death.

MAINTENANCE

The HD-11 does not require regular maintenance. The unit uses a
self-purging semi-conductor sensor that has a long life expectancy.
All service and repair of the HD-11 are to be performed by Macurco.
Macurco does not sanction any third-party repair facilities.

! WARNING

Do not disassemble unit or attempt to repair or modify any component of this
instrument. This instrume
substitution of components may impair intrinsic safety which may adversely
affect product performance and result in sickness or death.

TESTING

Once the unit is fully operational (the green light is on steady), test
the unit by directing gas from an unlighted butane cigarette lighter
into the detector near the left hand side through one of the vent
holes.

It will be necessary to hold the lighter valve open for several
seconds. The red light (ALARM) will turn on, the alarm relay
switches, and any devices connected should activate. The detector
should be tested regularly by using gas from an unlit cigarette lighter,
as detailed above.

nt contains no user serviceable parts, and

ventilation

The HD-11 should be cleaned using the soft brush attachment o
your vacuum cleaner. The HD-11 should be tested after cleaning t
ensure the unit is operating normally.

SENSOR POISONS

The gas-sensing tip in the detector is designed with extrem
sensitivity to the environment. As a result, the sensing function of th
tip may deteriorate if it is exposed to a direct spray from aerosol
such as paints, silicone vapors, etc., or to a high density of corrosiv
gases (such as hydrogen sulfide, sulfur dioxide) for an extende
period of time.

LIMITED WARRANTY

The Macurco HD-11 Hydrogen Gas Detector is warranted to be fre
from defective material and workmanship for a period of two (2) year
from the date of manufacture (stamped on the unit). If an
component becomes defective during the warranty period, it will b
replaced or repaired free of charge, if the unit is returned i
accordance with the instructions below. This warranty does not appl
to units that have been altered or had repair attempted, or that hav
been subjected to abuse, accidental or otherwise. The abov
warranty is in lieu of all other express warranties, obligations o
liabilities. THE IMPLIED WARRANTIES OF MERCHANTABILIT
AND FITNESS FOR PARTICULAR PURPOSE ARE LIMITED TO
PERIOD OF TWO (2) YEARS Macurco shall not be liable for an
incidental or consequential damages for breach of this or any othe
warranty express or implied arising out of or related to the use of sai
equipment. Manufacturer or its agent’s liability shall be limited t
replacement or repair as set forth above. Buyer’s sole and exclusiv
remedies are return of the goods and repayment of the price, o
repair and replacement of non-conforming goods or parts.

Manufactured by Aerionics, Inc.
Sioux Falls, SD
Email: [e-mail]
Phone: [phone]
Rev 05.14.2014
© Aerionics 2014. All rights reserved.
Macurco is a trademark of Aerionics, Inc.