Detcon 110A-FB-BBU User Manual

detcon inc.

Detcon Model 110A-FB-BBU

Gas Detection System

Operator's Instruction Manual

January 1, 1999, Document #2474, Revision 1.0

SPECIFIC

GAS

MONITOR

ppm / %

MODEL 110A-FB

HIGH

LOW

FAULT

detcon inc.

TEXASHOUSTON

ALARM
NL
L

HIGH

0

9

8

HIGH

ALARM

SET

1

2

3

4

5

6

7

LOW

ALARM

0

1

9

8

7

SET

0

1

2

2

3

3

4

4

5

5

9

6

6

8

7

LOW

ALARM

NL
L

0

1

2

3

4

5

9

6

8

7

❏ 1.0 INTRODUCTION

Detcon Model 110A-FB-BBU gas detection system consists of 2 major assemblies:

1. The NEMA 4 fiberglass control enclosure.

2. The remote mount gas sensor assemblies.
The NEMA 4 fiberglass control enclosure is detailed in section 1.0 of the manual and
applicable sensor assemblies in section 3.0.

❏ 1.1 DESCRIPTION

Detcon Model 110A-FB-BB is a single channel gas detection system, designed to supervise and display
the status of remote sensor assemblies that monitor ambient air for a variety of toxic and combustible
gases. The digital controls are compatible with a linear 4-20 madc input signal. The front panel features a
direct reading 2 digit display of the concentration of gas and 3 alarm functions that are status displayed via
light emitting diodes.
The assembly is enclosed in a NEMA 4X molded fiberglass case with a hinged, gasketed door and is
designed for surface mounting in both indoor and outdoor locations. A plexiglas view window is mounted
in the door. The NEMA 4X rating is by definition raintight and therefore suitable for outdoor location in
electrically non-hazardous environments.
The system is powered by AC line power and is backed up by batteries in the event of a power failure.
The control enclosure includes, as standard operating controls (DWG #800.27A); a power on/off switch,
an alarm reset switch, an alarm disable switch with LED indicator, AC line power fuse, DC power fuse,
sensor power loop fuse, and alarm output fuses (5A) for Fault, Low and High alarm dry contacts. Discreet
output terminal strips located on the controller mother board are provided for AC power in, DC power from
batteries, sensor terminations, 4-20ma output for remote recording devices, remote reset and Form C dry
contacts (Common, NO and NC). Contacts are provided for 3 alarms; High, Low and Fault and are rated
8 amp @ 117 VAC / 5 amp @ 30 VDC. Additional controls include latching / non-latching alarms, alarm
firing direction, and alarm set dip switches.

❏ 1.2 PROGRAMMING THE 110A-FB

The 110A-FB-BBU controller board has several functions that may be changed or activated by the user.
These include alarm set points, alarm firing direction (descending or ascending), latching alarms, alarm
disable and other functions that will be fully discussed below.

❏ 1.3 ALARM LEVEL PROGRAMMING

The Low and High alarm levels are adjustable in single digit increments from 1 to 99% of scale. To
program, refer to SW1, SW2, SW3 and SW4 (drawing #800.27A). SW1 corresponds to the Most
Significant Digit (10's) on the high alarm. SW2 corresponds to the Least Significant Digit (1's) on the High
alarm. SW3 corresponds to the Most Significant Digit (10's) on the Low alarm. SW4 corresponds to the
Least Significant Digit (1's) on the Low alarm.
While using a jeweler's screw driver, program the corresponding switches to the desired set point. For
example,if the Low alarm set point is 10 ppm / %, set SW3 to 1 and SW4 to 0. If the High alarm set point
is25, set SW1 to 2 and SW2 to 5.

❏ 1.4 LATCHING / NON-LATCHING ALARMS

The Low and High alarm relays may be programmed for latching or non-latching operation. To program,
refer to JP4 - Low; and JP1 - High (drawing #800.27A). To program for non-latching operation, place the
jumper tab on the upper 2 pins of the connector. To program for latching operation place the jumper tab on
the lower 2 pins of the connector.

❏ 1.5 ALARM FIRING DIRECTION

The Low and High alarms may be programmed to fire during ascending gas conditions or descending
gas condition (as in oxygen deficiency monitoring). To program, refer to JP3 - Low; and JP2 - High
(drawing #800.27A). To program for an alarm to fire in ascending gas conditions, place the jumper tab on
the upper 2 pins of the connector (>). To program for an alarm to fire in descending gas conditions, place
the jumper tab on the lower 2 pins of the connector (<).

Detcon Model 110A-FB-BBU Gas Detection System PG.2

❏ 1.6 ALARM CONTACTS

Contacts are provided for 3 alarms; High, Low and Fault and are rated 8 amp @ 117 VAC / 5 amp @ 30
VDC. Alarm contacts are Form C dry contacts; common, normally open and normally closed. A 5 amp
micro-fuse is provided in series with the common relay contact for each alarm.

❏ 1.7 ALARM RESET

The alarm reset switch located on the 110A-FB-BBU motherboard is a normally open momentary
switch. The reset function is effective when the Low and/or High alarms have been programmed in the
latching position and alarm conditions have passed.

❏ 1.8 REMOTE RESET

A remote mounted normally open momentary switch may be used to reset the Model 110A-FB-BBU
controller. The reset function is effective when the alarms have been programmed in the latching position
and alarm conditions have passed.

❏ 1.9 ALARM DISABLE

An alarm disable switch located on the motherboard will deactivate the Low and High alarm relays. An
LED indicator located next to the switch will light when in the disable mode. CAUTION: The alarm disable
function is a completely manual operation and care must be used to remember to put the switch back in
the "Able" position after maintenance is completed.

❏ 1.10 POWER REQUIREMENTS

Model 110A-FB-BBU contains an internally mounted 24 vdc power supply that operates on 117 vac.
Terminations are also provided on the motherboard for auxilary DC input (on model 110A-FB-BBU, these
terminals are used for the battery backup). A 1/2 amp 3AG slow blow fuse mounted on the power supply
protects against excessive line power (117 vac). To replace, remove the 110A-FB face plate and then the
controller board directly above the power supply. Excessive DC current is protected by a 1 amp micro-fuse
located on the mother board.

❏ 1.11 FAULT CIRCUIT FUNCTIONS

Model 110A-FB-BBU digital controls feature fail safe supervisory circuits designed to assure maximum
reliability in system performance. The fault circuits supervise all field wiring between remote mounted
sensor assemblies as well as supervise critical internal power supplies. Field wiring between sensors and
control modules consists of + and – power loop and the 4-20 madc signal loop referenced to the – power
loop. The fault relay is normally energized and will de-energize in the event of open power or signal loop
between sensor and control module. Additionally the fault circuit will illuminate the front panel fault LED. The
power loop to the remote sensor is fused (1/2 amp) on the motherboard to prevent circuit damage as a
result of reverse polarity termination, induced transient spikes or shorted field wiring.

❏ 1.12 DISPLAY ZERO

The potentiometer (see drawing #800.27A) labled "Display Zero" is used to calibrate the digital display
in accordance with the 4-20 madc signal input. This is factory set and should not require any user
adjustment. Should fine tuning become neccessary the display should be calibrated to read "01" with a
signal input of .16 madc.

Detcon Model 110A-FB-BBU Gas Detection System PG.3

❏ 1.13 ANALOG 4-20 MA OUTPUT CALIBRATION

The 110A-FB-BBU, 4-20 madc output is factory calibrated and tested prior to shipment and should not
require field level adjustment. Should fine tuning become necessary, the digital to anlog converter is
calibrated via the 4-20 MA Span and Zero potentiometer as shown on drawing #800.27A.

❏ 1.14 INTERNAL BATTERY BACKUP

The 110A-FB-BBU comes with a battery backup option not included with the 110A-FB. This option
includes two batteries mounted under the motherboard that, in the event of a loss of VAC power, will
power the unit for up to 18 hours. The batteries are automatically recharged when VAC power is
re-established. Care should be taken to not allow the unit to run on battery power for more than 18
hours. The battery backup function is disabled when the power switch is turned to the off position.

❏ 1.15 INSTALLATION

Step 1. Securely mount the 110A-FB-BBU enclosure in accordance with detail drawing #801-BBU.
Step 2. Connect 117 VAC input wiring to the lugless terminal strip (labled VAC IN) on the controller
mother board as detailed in drawing #800.27A. Line power current load is maximum .5 amps.
Step 3. Note that the 24 VDC standby batteries are prewired to the lugless terminal strip (labeled VDC
IN) on the controller motherboard..
Caution: Observe correct polarity when terminating all input / output field wiring. Failure to do so may
result in circuit damage on power up.
Step 4. If applicable, connect a normally open momentary remote mounted switch to the lugless
terminal strip (labled RESET) located on the cotroller mother board as detailed in drawing #800.27A
Step 5. Refer to installation and wiring detail of remote mount sensor assemblies as detailed in section

3.0. Terminate field wiring from sensors to Model 110A-FB-BBU lugless terminal strips located on the
controller mother board as shown in drawing #800.27A.
Note: Based on the application and use of relay contact outputs, complete all wiring terminations prior
to application of power. Shut-in controls may be omitted until system test is complete.

❏ 1.16 START-UP

Upon completion of all field wiring:
Turn the unit on via the power switch located on the motherboard. Note that the 110A-FB-BBU digital
display illuminates. Varying readings may occur

❏ 1.17 SPECIFICATIONS

RANGE - 0-99 ppm
ACCURACY / REPRODUCIBILITY - + or – 1% F.S.
OPERATING TEMPERATURE - –40 deg. F to +175 deg. F
INPUT POWER - 117 vac
POWER CONSUMPTION - max 6 watts
WARRANTY - one year
OUTPUTS - 4-20 madc

Detcon Model 110A-FB-BBU Gas Detection System PG.4

❏ 1.18 ORDER GUIDE

MODEL NO.

HS - 110A-FB
02 - 110A-FB
CO - 110A-FB
SO - 110A-FB
NO - 110A-FB
NX - 110A-FB
H2 - 110A-FB
CH - 110A-FB
HC - 110A-FB
CL - 110A-FB
HL - 110A-FB

PART NO.

9180
9181
9182
9183
9184
9185
9186
9187
9188
9189
9190

GAS

Hydrogen Sulfide
Oxygen Deficiency
Carbon Monoxide
Sulfur Dioxide
Nitrogen Dioxide
Nitric Oxide
Hydrogen
Combustible Hydrocarbons
Hydrogen Cyanide
Chlorine
Hydrogen Chloride

RANGE

0 - 99 ppm
0 - 25 %
0 - 99 ppm
0 - 99 ppm
0 - 99 ppm
0 - 99 ppm
0 - 99 ppm
0 - 99 % LEL
0 - 99 ppm
0 - 99 ppm
0 - 99 ppm

❏ 1.19 WARRANTY

Detcon Inc., as manufacturer, warrants under intended normal use each new Model 110A-FB-BBU
control enclosure to be free from defects in material and workmanship for a period of one year from the
date of shipment to the original purchaser. All warranties and service policies are FOB the Detcon Inc.
facility located in the Woodlands, Texas.

❏ 1.20 SPARE PARTS

PART # DESCRIPTION

0224 Gold plated jumper tab
0290 .5 amp micro fuse - box of 5
0292 1 amp micro fuse - box of 5
0295 5 amp micro fuse - box of 5
0297 1 amp 3AG slow blow fuse - box of 5
3604 110A-FB power supply assembly
3423 12VDC, 2.6 amp/hour battery (two
required)

Mailing address: P.O. Box 8067, The Woodlands, Texas 77387-8067 ❏ Phone: [phone] ❏ Fax: [phone]

Shipping address: 3200 A-1 Research Forest Dr., The Woodlands, Texas 77381

HEIGHT = 3.5"

7.25

1 Amp slow blow
is mounted on power supply.

9.25

DISPLAY ZERO

4-20 MA SPAN

4-20 MA ZERO

NON-LATCH

LATCH

SW1

L1L2
VAC IN

FACTORY SET

HIGH

ALARM

JP1

JP2

POWER

ON

OFF

VDC IN

SPECIFIC

GAS

MONITOR

ppm / %

MODEL 110A-FB

HIGH

LOW

FAULT

detcon inc.

HIGH

ALARM

SET

SW1 SW2 SW3 SW4

0

0

1

1

2

2

3

3

4

4

5

9

8

7

MOST SIGNIFICANT DIGIT

5

9

6

6

8

7

LEAST SIGNIFICANT DIGIT

SENSOR

1/2 AMP

FLT

5 AMP

C

SENSOR

FAULTFAULT LOW HIGH 4-20

TEXASHOUSTON

LOW

ALARM

SET

0

1

2

3

4

5

9

6

8

7

MSD LSD

LOW

5 AMP

C

NCNO

0

9

8

HIGH

5 AMP

NCNO

1

6

7

C

LOW

ALARM

NON-LATCH

2

3

4

5

LATCH

JP3

JP4

ALARM FIRING DIRECTION
ASCENDING >; DECENDING <

PUSH

ALARM

AB LE

ALARM
RESET

NCNOMA

RESET

ALARM

DISAB LE

ALARM

DISAB LE

INDICATOR

LED

OUT

detcon inc.

MATERIAL

TITLE

110A-FB CONTROLS/CONTROLLER TERMINALS 800.27A

DRN BY

FINISH

TED S.

SCALE

SHEET OF

APPROVED BY

STOCK #

DRAWING NUMBER

DATE

STATUS

REV #

02-19-91

ORANGE CONNECTOR

RIBBON CONNECTOR

L1 IN

L2 IN

COM

PLUG

POWER SUPPLY

1

1 AMP
SLOW
BLOW

3

2

+DC OUT

+DC

3

4

1A
F6

D5

4001

D6

SA30CA

F1
JUMP

D4
JUMP

SW1

POWER

COM

1

2

4

+ OUT +S - OUT -S

RED
CR1

R1
1K

5 7 9

D2

K2

4

5

2

1

3

F4
5A

SW2

F2
1/2A

ALARM

DISABLE

5

1

F3
5A

D1

K1

D3

K3

4

2

3

4

5

2

1

3

F5
5A

61211

8

RESET

SW3

BATTERY

12V 2.6 A/H

detcon inc.

MATERIAL

BATTERY

12V 2.6 A/H

TITLE

DRN BY

FINISH

L1 L2

VAC

IN

VDC

IN

SENSOR

C

MA

NO

FAULT LOW HIGH

110A-FB-BBU SCHEMATIC / WIRING DIAGRAM

TED S.

SCALE

SHEET OF

APPROVED BY

STOCK #

NCCNO

DRAWING NUMBER

DATE

STATUS

NCCNO

4-1-92

NC

4-20MA

1090A

REV #

REMOTE

RESET

0

7"

0

REV #

801-BBU

2-19-91

PADLOCKING

LATCH

6"

10"

DRAWING NUMBER

110A-FB-BBU DIMENSIONS / MOUNTING DETAIL

TITLE

STATUS

DATE

STOCK #

APPROVED BY

SCALE

SHEET OF

TED S.

DRN BY

FINISH

.31" DIA. MOUNTING HOLE

.56" DIA. COUNTERBORE

13"

10.75"

detcon inc.

MATERIAL