Sensidyne Sensalert User manual

Document No. 7013227M
(Revision H)
FOUR CHANNEL CONTROLLER
Sensidyne, LP
1000 112th Circle N, Suite 100
St. Petersburg, Florida 33716 USA
[phone] • [phone] • Fax: [phone]
web: www.sensidyne.com • e-mail: [email protected]
RESET
BUTTON
▼
• Push RESET to unlatch a LATCHED ALARM
• Push RESET to silence a local LO ALARM
• Push RESET for 5 seconds to enter CAL MODE
(Push RESET again to exit CAL MODE)
OXYGEN
19.3 %VOL
LO HI
HI HI
METHANE
9 %LEL
LO HI
HI HI
AMMONIA
19 PPM
LO HI
HI HI
CHLORINE
0.3 PPM
LO HI
HI HI
FAULT
CH 1
FAULT
CH 3
FAULT
CH 4
FAULT
CH 2
POWER
DC PWR
BACK UP
AC PWR

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Sensidyne Document No. 7013227M (Rev H)
3
SENSALERT FOUR CHANNEL CONTROLLER
DISCLAIMER
SENSIDYNE, LP ASSUMES NO RESPONSIBILITY WHATSOEVER, TO ANY PARTY WHOSOEVER, FOR
ANY PROPERTY DAMAGE, PERSONAL INJURY, OR DEATH RECEIVED BY OR RESULTING FROM, IN
WHOLE, OR IN PART, THE IMPROPER USE, INSTALLATION, OR STORAGE OF THIS PRODUCT BY
THE USER, PERSON, FIRM, ENTITY, CORPORATION OR PARTY NOT ADHERING TO THE INSTRUC-
TIONS AND WARNINGS OR NOT ADHERING TO ALL FEDERAL, STATE, AND LOCAL ENVIRONMEN-
TAL AND OCCUPATIONAL HEALTH AND SAFETY LAWS AND REGULATIONS.
THE SELLER SHALL NOT BE LIABLE FOR DIRECT, INDIRECT, CONSEQUENTIAL, INCIDENTAL OR
OTHER DAMAGES RESULTING FROM THE SALE AND USE OF ANY GOODS AND SELLER’S LIABIL-
ITY HEREUNDER SHALL BE LIMITED TO REPAIR OR REPLACEMENT OF ANY GOODS FOUND DE-
FECTIVE. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, IN-
CLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR USE OR FOR A PARTICULAR PURPOSE WHICH ARE EXPRESSLY DISCLAIMED.
Always check to make certain you have received all of the items listed above. If you have any questions or
need assistance, contact your Sensidyne Representative, or call [phone] or [phone]
The items listed below are shipped with the SensAlert Four Channel Controller:
• 4–20 mA controller with built-in readout displays,
housed in a NEMA 4X fiberglass enclosure.
•Operation and Service Manual
PACKING LIST & NOTICES
PROPRIETARY NOTICE
This manual was prepared by Sensidyne, LP exclusively for the owner of the SensAlert Four Channel Controller. The material within this manual is
the proprietary information of Sensidyne, LP and is to be used only to understand, operate, and service the instrument. By receiving this docu-
ment, the recipient agrees that neither this document nor the information disclosed within nor any part shall be reproduced or transferred, physi-
cally, electronically or in any form or used or disclosed to others for manufacturing or for any other purpose except as specifically authorized in
writing by Sensidyne, LP.
COPYRIGHT NOTICE
© 2002, © 2008 Sensidyne, LP. All rights reserved. Information contained in this document is protected by copyright. No part of this document may
be photocopied, reproduced, or translated to another program or system without prior written authorization from Sensidyne, LP.
TRADEMARK NOTICE
Sensidyne, the Sensidyne logo, SensAlert, and the SensAlert logo are registered trademarks of Sensidyne, LP. SensAlarm is a trademark of Sensidyne,
LP. The trademarks and service marks of Sensidyne, LP are protected through use and registration in the United States.
SOFTWARE LICENSE
The software included with the SensAlert is the property of Sensidyne, LP and shall remain the property of Sensidyne, LP in perpetuity. The soft-
ware is protected by U.S. and international copyright laws and is licensed for specific use with the SensAlert Four Channel Controller. The user
may NOT reverse-engineer, disassemble, decompile, or make any attempt to discover the source code of the software. The software may NOT be
translated, copied, merged or modified in any way. The user may NOT sublicense, rent, or lease any portion of the software. The right to use the
software terminates automatically if any part of this license is violated.

PRELIMINARY
SENSALERT FOUR CHANNEL CONTROLLER
Sensidyne Document No. 7013227M (Rev H)
4
• PREFACE
• Packing List & Notices.............................................................................................................3
• WARNINGS ............................................................................................................................. 7
SECTION ONE: INTRODUCTION
1.1 Overview ...................................................................................................................... 8
1.2 Components ................................................................................................................. 9
1.2.1 Controller Housing ......................................................................................... 9
1.2.2 Display PCB .................................................................................................... 9
1.2.3 Bottom PCB .................................................................................................... 9
1.3 Operator Buttons ........................................................................................................11
1.4 Controller Screens .......................................................................................................12
1.4.1 System Screens ..............................................................................................12
1.4.2 Channel Screens ............................................................................................12
SECTION TWO: INSTALLATION
2.1 Mounting & Wiring .....................................................................................................15
2.1.1 Terminal Designations ..................................................................................15
2.1.2 Jumpers ..........................................................................................................16
2.1.3 Fuses ..............................................................................................................16
2.1.4 Potentiometers ...............................................................................................16
2.2 Wiring Procedure ........................................................................................................18
2.3 Initial Start-Up..............................................................................................................21
TABLE OF
CONTENTS

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SENSALERT FOUR CHANNEL CONTROLLER
SECTION THREE: OPERATION
3.1 Main Screen .................................................................................................................25
3.2 View Alarm Settings (Menu #1) ..................................................................................25
3.3 Entering a Password....................................................................................................25
3.4 Entering Calibration Mode ..........................................................................................26
SECTION FOUR: CHANGING ALARM SETTINGS
• Changing Alarm Settings .............................................................................................28
SECTION FIVE: USING SET-UP & DIAGNOSTICS
5.1 Set-Up (Menu #3) ........................................................................................................29
5.1.1 Enable/Disable a Channel.............................................................................29
5.1.2 Set Calibration Delay .....................................................................................29
5.1.3 Changing the Password.................................................................................30
5.1.4 Changing the RS-485 Address .......................................................................30
5.1.5 Setting Alarm Latching ..................................................................................32
5.1.6 Energize Relay ...............................................................................................32
5.1.7 Adjusting the Zero Point ...............................................................................32
5.2 Diagnostics (Menu #4) ................................................................................................33
5.2.1 Self-Test..........................................................................................................33
5,2.2 Relay Check ...................................................................................................33
SECTION SIX: MAINTENANCE & SERVICE
6.1 Adjusting the Output ...................................................................................................34
6.2 Replacing the Power Supply ......................................................................................34
6.3 Replacing the Display PCB .........................................................................................35
6.4 Replacing the Bottom PCB .........................................................................................35
SECTION SIX: PARTS LIST
• Controller Parts .....................................................................................................................36
TABLE OF
CONTENTS

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SENSALERT FOUR CHANNEL CONTROLLER
Sensidyne Document No. 7013227M (Rev H)
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LIST OF
FIGURES & TABLES
APPENDICES
• Appendix A: Specifications
• General Specifications ............................................................................................37
• Appendix D: Troubleshooting Guide
• Troubleshooting Guide ..........................................................................................38
• Appendix E: Returned Material Authorization
• Returned Material Authorization ............................................................................39
• Service Options ......................................................................................................39
LIST OF FIGURES
Section One: Introduction
1.1 Display PCB .............................................................................................................10
1.2 Controller Menu System: Main Screens .................................................................13
1.3 Controller Menu System: Individual Channel Screens..........................................14
Section Two: Installation
2.1 Controller Wiring: Bottom PCB .............................................................................17
2.2 Attaching the Mounting Feet ...................................................................................18
2.3 Controller Mounting ................................................................................................19
2.4 Terminal Wiring Guide ............................................................................................20
2.5 Wiring to a SensAlert Transmitter (with Intrinsic Safety Barrrier).........................22
2.6 Wiring to a SensAlert Transmitter (without Intrinsic Safety Barrrier) ...................23
2.7 Wiring to a non-SensAlert Transmitter (without Intrinsic Safety Barrrier)............24
Section Three: Operation
3.1 Entering a Password ................................................................................................27
Section Five: Using Set-Up & Diagnostics
5.1 Changing a Password ..............................................................................................31

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Sensidyne Document No. 7013227M (Rev H)
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SENSALERT FOUR CHANNEL CONTROLLER
READ AND UNDERSTAND ALL WARNINGS BEFORE USE
Read and understand ALL warnings before using this product. Failure to read, understand, and
comply with ALL warnings could result in property damage, severe personal injury, or death.
Read and understand ALL applicable Federal, State, and Local environmental health and safety
laws and regulations, including OSHA. Ensure complete compliance with ALL applicable laws
and regulations before and during use of this product.
UNDER NO CIRCUMSTANCES should this product be used except by qualified, trained, techni-
cally competent personnel and not until the warnings, Operation and Service Manual, labels,
and other literature accompanying this product have been read and understood.
This product should NOT be used in any way other than specified in this manual.
DO NOT remove, cover, or alter any label or tag on this product, its accessories, or related
products.
DO NOT operate this product should it malfunction or require repair. Operation of a malfunc-
tioning product, or a product requiring repair may result in serious personal injury or death.
DO NOT attempt to repair or modify the instrument, except as specified in the Operation and
Service Manual. Contact the Sensidyne Service Department to arrange for a Returned Material
Authorization (RMA).
ONLY use genuine SENSIDYNE®replacement parts when performing any maintenance procedures
provided in this manual. Failure to do so may seriously impair instrument performance.Repair or
alteration of the product beyond the scope of these maintenance instructions, or by anyone other
than a certified SENSIDYNE®serviceman, could cause the product to fail to perform as designed and
persons who rely on this product for their safety could sustain severe personal injury or death.
AC (Earth) ground MUST terminate on each controller’s ground terminal to prevent an electric
shock-hazard. A PCB board mounted ground lug is supplied with each unit.
Operation of the alarm relays above their contact ratings may result in false alarms or relay failure.
CAUTIONARY NOTE
The output signal to the recorder, or other data gathering device, is always “live.” That is, the display
reading is transmitted directly through the recorder output to whatever peripheral device is attached
to the controller. Any recorder or other data gathering device should be turned off during
calibration.
WARNINGS

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SENSALERT FOUR CHANNEL CONTROLLER
Sensidyne Document No. 7013227M (Rev H)
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1.1 OVERVIEW
IMPORTANT
Youmustreadthismanualinits entiretytoensureproper
operation of the controller.
This manual provides specific information concerning
the installation, operation, and maintenance of the
Sensidyne SensAlert Controller.
The SensAlert Controller, when used with a Sensidyne
external I.S. barrier (PNº 7013263), is designed to oper-
ate an intrinsically safe SensAlert transmitter in areas
classified Class I, Division 1, Groups A, B, C, D; Class II,
Division 1, Groups E, F, G.
SECTION ONE
INTRODUCTION
The Sensidyne SensAlert Controller is an integral part
of the SensAlert Gas Monitoring System. The SensAlert
Controller, housed in a NEMA 4X enclosure, provides
separate single pole double throw (SPDT) relays for
each alarm condition, plus one common relay for a
fault condition. It also serves as an interface when an
event needs to be relayed to a peripheral device, such
as a building fire alarm system. The SensAlert Control-
ler displays can display gas levels in either ppm, %vol,
or %LEL, depending on the installed sensor.
The power supply for the controller has been designed
to operate at 90-265 VAC, with the capability of add-
ing a 24 Vdc backup power supply.
Some of the features of SensAlert Four Channel Con-
troller include:
• Auto-recognition of sensors
• Lo, Hi, HiHi, & Fault alarms
• User-selectable alarm levels
• Three relay contacts per sensor
• Lockout/tagout designed case
• RS-485 serial output
• 4-20 mA / 1-5 volt output
• Password protection

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Sensidyne Document No. 7013227M (Rev H)
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SENSALERT FOUR CHANNEL CONTROLLER
1.2 COMPONENTS
1.2.1 Controller Housing
The NEMA 4X enclosure is made of high-grade, fiber-
glass reinforced polyester resin matting. The enclosure
provides a weather-resistant and water-resistant barrier
between the internal electronics and the ambient envi-
ronment. The controller cover is secured to the hous-
ing with 2 quick release latches. Each latch has a
small circular knockout that allows the case to be
locked or tagged to prevent unauthorized entry.
The Reset switch is located on the bottom of the con-
troller housing (refer to Figure 2.1). The switch can be
used to (1) unlatch a latched alarm, (2) silence a local
Lo Alarm, or (3) enter Calibration Mode (when
pressed for 5 seconds).
The Alarm Buzzer is located on the bottom of the
controller housing, next to the cable glands. The
alarm buzzer is used for the Local Alarm.
1.2.2 Display PCB
The Display PCB contains the large, 3-digit LED dis-
plays, the LCD displays, and the operator buttons that
control the menu system. The Display PCB connects
to the Bottom PCB via a 20-pin flex cable. The com-
ponents on the Display PCB are described as follows.
• Liquid Crystal Display
The Liquid Crystal Display (LCD) is a 16 character, 2-
line display located behind the front cover of the con-
troller enclosure (see Figure 1.1). During normal op-
eration, the display shows the gas name and gas con-
centration (in ppm, %LEL, or %vol) for the sensor in-
stalled at the transmitter. The display is also used for
viewing and changing various features of the
controller (e.g., alarm settings, passwords, etc.).
During alarm and fault conditions, the display shows
status messages on Line 2 describing the nature of the
condition (e.g., Lo Alarm, Missing Sensor, etc).
• Operator Buttons
The 5 Operator Buttons a control the menu system.
The menu system allows you to view and change
alarm settings, change system features, and perform
diagnostics. A detailed description of the menu system
and operator buttons can be found in Sections 1.3 &
1.4.
1.2.3 Bottom PCB
The Bottom PCB (see Figure 2.1) is attached to the in-
side bottom of the controller housing. The compo-
nents located on the Bottom PCB are described be-
low.
The Bottom PCB is populated with 11 terminal blocks.
Each terminal block consists of a base block and a
keyed, removable terminal plug that facilitates wiring.
Terminal wiring designations are described in Section
Two.
The Bottom PCB also contains jumpers, AC & DC
fuses, and a current limiting 4 channel power supply.

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SENSALERT FOUR CHANNEL CONTROLLER
Sensidyne Document No. 7013227M (Rev H)
10
Figure 1.1
Display PCB
NEXT
▲UP
▼ DOWN
SELECT
CHANNEL
SELECT
OXYGEN
19.3 %VOL
LO HI
HI HI
OXYGEN
19.3 %VOL
OXYGEN
19.3 %VOL
LO HI
HI HI
OXYGEN
19.3 %VOL
LO HI
HI HI
LO HI
HI HI
AC PWR
DC BACK UP
METHANE
9 %LEL
CHLORINE
.3 PPM
CH3
CH1
CH4
CH2
LO, HI, & HIHI
Alarm LEDs
(4 PLACES)
LCD Display
16 Char X 2 Line
(4 places)
Operator
Buttons
Power LEDs
Hinged Sandoff
(under PCB)
Hinged Standoff
(under PCB) Mounting Screw
Mounting
Screw
Channel &
Fault LED
(4 places)
CARBON MONOXIDE
19 PPM

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SENSALERT FOUR CHANNEL CONTROLLER
▲ UP & ▼ DOWN
The ▲UP and ▼DOWN buttons have two purposes.
• To scroll “up” or “down” different menu lists.
Each screen indicates which type of scrolling is
available by displaying either an ▲or ▼arrow.
When both arrows appear on the display, up and
down scrolling is available.
• To increase or decrease a value shown on the
screen (such as an alarm setting or a password
code).
SELECT
The SELECT button is used to select an item from a
menu list after you have scrolled to that item using the
▲UP or ▼DOWN buttons.
The SELECT button also is used to accept a value after
it has been changed (e.g., a new alarm setting). It is
similar to the RETURN/ENTER key on a keyboard.
1.3 OPERATOR BUTTONS
Figures 1.2 and 1.3 show the operator buttons that
control the menu system.
The buttons are described below.
CHANNEL SELECT
The CHANNEL SELECT button is used to access a chan-
nel for system programming.
NEXT
The NEXT button has two funrctions:
• Pushing the NEXT button,during normal operation
displays the current alarm settings for all 4 chan-
nels (see Figure 1.2).
• Pressing the NEXT button after selecting a channel
moves you through the Set Alarm, Set-up, and Di-
agnostics screens for that channel (see figure 1.3).

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SENSALERT FOUR CHANNEL CONTROLLER
Sensidyne Document No. 7013227M (Rev H)
12
1.4 CONTROLLER MENUS
Figures 1.2 and 1.3 show the primary controller
screens: Main Screen, View Alarms (#1), Set Alarms
(#2), Set-Up (#3), and Diagnostics (#4). There is also an
Enter Password screen that appears if a password has
been set. The CHANNEL SELECT and NEXT buttons are
used to navigate through the menu screens.
1.4.1 System Screens
• Main
The Main Screen is the primary screen during normal
operation. It displays the gas name and gas concentra-
tion (in ppm, %LEL, or %VOL). During alarm or fault
conditions, the Main Screen displays warning messages
on Line 2. These messages are shown in Figure 1.3.
• View Alarms (#1)
The View Alarms Screen shows the current settings for
the Lo, Hi, and HiHi alarms. This screen is always avail-
able whether or not a password has been set. The
alarm settings can be viewed by pressing the NEXT but-
ton during normal operation.
• Enter Password
This screen appears after you press the CHANNEL SE-
LECT button and a password has been set. You must
enter a valid 4-digit password to access the Set Alarms,
Set-Up, and Diagnostics screens in any of the 4 chan-
nels. The unit is shipped from the factory without a
password.
1.4.2 Channel Screens
The following screens are available for each of the
four controller channels.
• Set Alarms (Menu #2)
This screen allows you to change the Lo, Hi, and Hi Hi
alarm settings. It also lets you set the alarms to their de-
fault (factory-set) values.
• Set-Up (Menu #3)
The Set-Up Screen allows you to change the following
SensAlert features:
• Enable/Disable a Channel
• Set Calibration Delay
• Change the Password
• Change the RS-485 Address (custom order)
• Set Alarm Latching (latched vs. unlatched)
• Energize Relay
• Adjust the Zero Point
• Diagnostics (Menu #4)
The Diagnostics screen contains routines that check the
state of the controller. These include a Self-Test (simi-
lar to the self-test conducted during initial start-up)
and an Alarm Relay Check.

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Sensidyne Document No. 7013227M (Rev H)
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SENSALERT FOUR CHANNEL CONTROLLER
Figure 1.2
Controller Menu System: Main Screens
NORMAL OPERATION SCREENS
CHANNEL 1
Use ▲& ▼buttons to
set code, then press
SELECT.
▼ ▲
ENTER PASSWORD
0000
This screen appears if password enabled.
CHANNEL 2CHANNEL 1
CHANNEL 3 CHANNEL 4
OXYGEN
19.3 %VOL
CHLORINE
0.3 PPM AMMONIA
19 PPM
• Line 1: Sensor Name • Line 2: Sensor Value
or status message:
METHANE
9 %LEL
CHANNEL 2CHANNEL 1
CHANNEL 3 CHANNEL 4
SCROLL & SELECT
▼LO ALARM
2
CHANNEL 2CHANNEL 1
CHANNEL 3 CHANNEL 4
SCROLL & SELECT
▼LO ALARM
2
CHANNEL 2CHANNEL 1
CHANNEL 3 CHANNEL 4
SCROLL & SELECT
▼LO ALARM
2
CHANNEL 2CHANNEL 1
CHANNEL 3 CHANNEL 4
SCROLL & SELECT
▼LO ALARM
2
VIEW ALARM SETTINGS
CHANNEL 2CHANNEL 1
CHANNEL 3 CHANNEL 4
LO HI HIHI
10 20 50
LO HI HIHI
10 20 50
LO HI HIHI
0.5 1.0 1.5
LO HI
10 20
1 1
1 1
QUICK VIEW
MAINTENANCE
CHANNEL
SELECT
SELECT
NEXT
▲UP ▼DN
CHANNEL
SELECT
SELECT
CHANNEL
SELECT
CHANNEL
SELECT
REFERS TO MENU#

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SENSALERT FOUR CHANNEL CONTROLLER
Sensidyne Document No. 7013227M (Rev H)
14
Figure 1.3
Controller Menu System: Individual Channel Screens
MAIN SCREEN SET ALARMS SCREEN (Menu #2)
NEXT
CARBON MONOXIDE
5 PPM
• Line 1: Sensor Name
• Line 2: Sensor Value
OR
"LOOP-FAIL"
"LO ALARM"
"HI ALARM"
"HIHI ALARM"
"LO ALARM LATCH"
"HI ALARM LATCH"
"HIHI ALARM LATCH”
PASSWORD SCREEN *
Use ▲& ▼buttons to set
code, then press SELECT.
ENTER PASSWORD
■000 ■ = 0
* Screen appears if password enabled
NEXT
MAIN SCREEN SET-UP SCREEN
(Menu #3)
• Enable/Disable
• Set Cal Delay
• Change Password
• RS-485 Addr
• Alarm Latching
• Energize Relay
• Adjust Zero
• Resume
▼
▲
SCROLL & SELECT
▼ ENABLE/DISABLE
3
OPERATOR BUTTONS
• Lo Alarm
• Hi Alarm
• HiHi Alarm
• Default
• Resume
SCROLL & SELECT
▼ LO ALARM
2
DIAGNOSTICS SCREEN
(MENU #4)
• Self Test
• Relay Check
• Resume
SCROLL & SELECT
▼ SELF TEST
4
• Advances to next Menu
NEXT
• Scrolls “up” a menu list
• Increases a value
▲▲UP
• Accepts changed value
• Selects item from menu
SELECT
• Scrolls “down” a menu list
• Decreases a value
▼▼DOWN
• Selects active channel
for programming
CHANNEL
SELECT
CHANNEL
SELECT
CARBON MONOXIDE
5 PPM
REFERS TO MENU#
NEXT
SELECT

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Sensidyne Document No. 7013227M (Rev H)
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SENSALERT FOUR CHANNEL CONTROLLER
SECTION TWO
INSTALLATION
2.1 MOUNTING & WIRING
The SensAlert Controller is designed to be wall
mounted. Four mounting feet are supplied. The feet
mount to the back of the enclosure and are secured to
the unit by 10-32 screws (3/8” in length). The feet must
be positioned vertically (refer to Figures 2.2 & 2.3).
The controller is wired to transmitters through EMT
connectors positioned at the bottom of the enclosure.
The EMT connectors prevent moisture from entering
the enclosure. The controller must be wired using
shielded twisted pair cable (with the shield tied to earth
ground) to achieve maximum RFI/EMI immunity.
NOTE
Useonly U.L. listedorrecognizedconduit hubs thathave
the same or better environmental rating as the enclo-
sure. Conduit hubs must be connected to the conduit
before being connected to the enclosure.
2.1.1 Terminal Designations
Wiring terminals are located on the Main (bottom) PCB.
They are designated as follows (see Figure 2.1):
Audible Alarm (J5)
The local alarm buzzer is factory wired. The local alarm
buzzer is located at the bottom of the controller hous-
ing, on the outside of the case.
Reset Switch (J4)
The Reset Switch is factory-wired. The switch is located
on the bottom of the controller housing, on the outside
of the case.
AC Power To Controller (J2)
The controller is wired to an AC power source through
these terminals. The terminal marked LO is used for the
neutral AC wire. The terminal marked HI is used for
the hot AC wire. The middle terminal is not used.
NOTE
When wiring the controller to a permanent A.C. source,
theA.C. sourcecircuit breaker and/orswitch must beIEC
approved.Thecircuitbreakerand/or switchmustbenear
theunitand marked as thedisconnectdevicefortheunit.
• Transmitter Power To Sensors (J8-J11)
This terminal is used to wire the controller to the
transmitter. A simplified wiring diagram showing how
the controller is wired to the transmitter is shown in
Figure 2.6). The terminals are wired as follows:
24V wire connects to the Positive Power on the
transmitter.
4–20 mA IN signal wire connects to the 4–20 mA
Signal Output terminal on the transmitter.
Power Return (PWR RTN) wire connects to the
Power Return terminal on the transmitter (3-wire
transmitters only).
• 4–20 mA Output (J6)
4-20 mA output is available for external devices for
each of the 4 channels. Each output can be indepen-
dently changed from 4-20 mA to 1-5 Volts using the
jumpers at JP1–JP4.
In addition, each channel output can be adjusted by
potentiometers VR1-VR4 for increased accuracy.
• 24 Vdc Battery Backup (J3)
A DC battery backup can be wired to controller. The
battery backup is wired as follows:
POS wire connects to the positive (+) terminal on
a 20-26 Vdc battery backup.
RTN (Power Return) connects to the negative (–)
terminal on a 20-26 Vdc battery backup.
There is fuse diode protection incorporated within the
unit such that reversing the wiring of the backup sup-
ply will not do any damage, but will merely burn out
the fuse. The backup supply must have an output of
20–26 Vdc @ 2 1/2 amp.

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SENSALERT FOUR CHANNEL CONTROLLER
Sensidyne Document No. 7013227M (Rev H)
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• Fault Relay (J12)
The Fault Alarm Relay (J12) acts in common to all
four channels and the system. It is factory-set (default)
to be energized during normal operation. The markings
at J12 reflect this intention. Therefore, unless the op-
eration is changed by the user, the fault relay’s SPDT
Form C contact acts as follows:
ENERGIZED
COM
NC
NO
No Alarm
(Normal)
• Alarm Relays (J8-J11)
Each channel has a set of 3 alarm relays which act in
accordance with the settings for their channel. These
relays each have one SPDT Form C contact. Unless the
factory setting (default) of de-energized during normal
operation is changed by the user, the alarm relays act
as follows:
The Lo Alarm Relays are factory-set to be normally
de-energized in normal operation:
ENERGIZED DE-ENERGIZED
COM
NO
NC
COM
NO
NC
(Normal)
No AlarmNo Alarm
The Hi Alarm Relays are factory-set to be normally
de-energized in normal operation:
ENERGIZED DE-ENERGIZED
COM
NO
NC
COM
NO
NC
(Normal)
No AlarmNo Alarm
The Hi Hi Alarm Relays are factory-set to be nor-
mally de-energized:
ENERGIZED DE-ENERGIZED
COM
NO
NC
COM
NO
NC
(Normal)
No AlarmNo Alarm
• RS-485 Output (J7)
The RS-485 Output terminals are designated as fol-
lows:
VCC
A
B
GND
Exact RS-485 functions to be determined for specific
applications.
2.1.2 Jumpers
1-5 Volt Output Select (JP1-JP4)
The analog output signal from the controller to an ex-
ternal device is factory set for 1–5 volts. This allows
output to a chart recorder or computer-based recorder
device. The jumpers are designated as follows:
JP1 = Channel 1
JP2 = Channel 2
JP3 = Channel 3
JP4 = Channel 4
Removing the jumper changes the output to 4–20 mA
for any channel using external termination.
2.1.3 Fuses
• AC Fuse: 4 amp, fast blow (Location: FS1).
• DC Fuse: 3 amp, fast blow (Location: F1).
2.1.4 Potentiometers
The accuracy of the analog output signal from the
controller can be adjusted by VR1-VR4. Clockwise ad-
justments increase the output level for that specific
channel. Counterclockwise adjustments decrease it.
The potentiometers are designated as follows:
VR1 = Channel 1
VR2 = Channel 2
VR3 = Channel 3
VR4 = Channel 4

PRELIMINARY
Sensidyne Document No. 7013227M (Rev H)
17
SENSALERT FOUR CHANNEL CONTROLLER
Figure 2.1
Controller Wiring: Bottom PCB
POWER SUPPLY
RS-485 functions to
be determined by
specific application
DC Connector
to PCB AC Connector
to PCB
24 VDC
Battery B/U
3 AMP
POS
RTN
CHANNEL 1 CHANNEL 2
PWR RTN
24V
4-20mA IN
FAULT
NO
COM
NC
GND
4-20 mA OUT
VCC
RS-485
A
ALARM
CH4
GND
CH3
GND
CH2
GND
CH1
GND
B
AC
JP3
JP1
F1
RESET
JP4
JP2
HIGH
COM
NC
NO
LOW
COM
NC
NO
CHANNEL 3 CHANNEL 4
PWR RTN
24V
4-20mA IN
HIGH
COM
NC
NO
LOW
COM
NC
NO
HI-HI
COM
NC
NO HI-HI
COM
NC
NO
J3
J4
J8 J9 J10 J11
J5
J2
NORMALLY ENERGIZED
4-20 mA Output Circuit (JP1-JP4)
Jumpers installed: 1-5 volts
Jumpers removed: 4-20 mA
VR3 VR4
VR1 VR2
J12
J7
J6
Safety Ground
[install ground wire
from power source here]
Neutral
AC Power Source (J2)
HOT
24 VDC Battery
Back-Up (J3)
Transmitters
(PWR RTN for
3-wire systems only)
Alarms
(Lo, Hi, & HI-HI each channel)
Fault Alarm
(energized in normal operation)
AC Fuse, 4 amp (FS1)
Output to External Device (J6)
(4-20 mA or 1-5 V)
Audible Alarm (J5)
(factory wired)
Reset Switch (J4)
(factory wired)
DC Fuse, 3 amp (F1)
NO = Normally Open
NC = Normally Closed
Output Adjust Potentionmeters
VR1 = Channel 1
VR2 = Channel 2
VR3 = Channel 3
VR4 = Channel 4

PRELIMINARY
SENSALERT FOUR CHANNEL CONTROLLER
Sensidyne Document No. 7013227M (Rev H)
18
2.2 WIRING PROCEDURE
Mount the controller to the wall using the four
mounting feet provided. The feet are positioned verti-
cally and then mounted to the back of the controller
housing with four 10-32 screws (see Figure 2.2).
Secure the controller housing to the wall with the ap-
propriate anchoring hardware. The mounting dimen-
sions are shown in Figure 2.3.
Wire the controller according to the terminal designa-
tions described in Section 2.1.1 and shown in Figure
2.1.
Wire the controller as follows (refer to Figures 2.1,
2.4, 2.5, 2.6, & 2.7):
1) Open the quick-release latches on the controller
housing and open the cover.
2) Unscrew the two right-hand mounting screws on
the Display PCB and swing it to the left (the
board is attached to 2 hinged standoffs.
3) Locate a terminal block you wish to wire.
4) Remove the terminal plug from the terminal
block [Figure 2.4-A]
5) Insert a terminal wire into the plug [Figure 2.4-B].
Note: Wires are inserted in the side of 2-, 3-,
and 4-position terminal plugs, and in the top
of 8- and 12-position terminal plugs.
6) Secure the wire by tightening the terminal screw
with a small flat blade screwdriver [Figure 2.4-C].
7) Complete Steps 5 & 6 for the remaining wires for
that terminal plug.
8) Replace the terminal plug on the terminal block
[Figure 2.4-D].
9) Complete Steps 3–8 for the remaining terminal
blocks.
Make certain you install the ground (earth) wire
under the lower level washer on the safety ground
terminal. Terminate the shields of the transmitter
cable under the upper level washers on the ground
terminal.
10) Install the ground wire (earth) to safety ground
(see Figure 2.1).
11) Close the Display PCB and secure it with the
mounting screws.
12) Close the controller cover and secure the quick
release latches.
Mounting
Foot
10-32 screw
Controller
Back
Figure 2.2
Attaching the Mounting Feet

PRELIMINARY
Sensidyne Document No. 7013227M (Rev H)
19
SENSALERT FOUR CHANNEL CONTROLLER
8.00”
12.94”
Reset Button
EMT Connectors
(optional)
Alarm Buzzer
Mounting Feet (4)
Quick-Release
Latch
Quick-Release
Latch
CHANNEL 1
CHANNEL 3 CHANNEL 4
CHANNEL 2
RESET
BUTTON
▼
• Push RESET to unlatch a LATCHED ALARM
• Push RESET to silence a local LO ALARM
• Push RESET for 5 seconds to enter CAL MODE
(Push RESET again to exit CAL MODE)
OXYGEN
19.3 %VOL
LO HI
HI HI
METHANE
9 %LEL
LO HI
HI HI
AMMONIA
19 PPM
LO HI
HI HI
CHLORINE
0.3 PPM
LO HI
HI HI
FAULT
CH 1
FAULT
CH 3
FAULT
CH 4
FAULT
CH 2
POWER
DC PWR
BACK UP
AC PWR
Figure 2.3
Controller Mounting

PRELIMINARY
SENSALERT FOUR CHANNEL CONTROLLER
Sensidyne Document No. 7013227M (Rev H)
20
TOP VIEW
SIDE VIEW
Insert wire into
terminal plug
B
MAIN BOARD
Install terminal plug on
appropriate terminal block
MAIN BOARD
Pull on terminal plug
to remove it from board
Terminal Plug
Terminal Block
(with guide pins)
Tighten terminal screw
with flat blade screwdriver
C
A
D
Figure 2.4
Terminal Wiring Guide