Detcon 110A-FB User Manual

Detcon Model 110A-FB

Gas Detection System

Operator's Instruction Manual

May 21, 2002, Document #2473, Rev. 1.1

Table of Contents

1.0 Introduction

1.1 Description

1.2 Programming the 110A-FB

1.3 Alarm Level Programming

1.4 Latching/Non-latching Alarms

1.5 Alarm Firing Direction

1.6 Alarm Contacts

1.7 Alarm Reset

1.8 Remote Reset

1.9 Alarm Disable

1.10 Power Requirements

1.11 Fault Circuit Functions & Power Sense Bypass

1.12 Installation

1.13 Start-up

1.14 Specifications

1.15 Order Guide

1.16 Warranty

1.17 Maintenance

1.18 Trouble Shooting

1.19 Parts List

1.20 Recommended Spare Parts for 1 Year

detcon inc.

1.0 INTRODUCTION

The Detcon Model 110A-FB 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 any applicable sensor
assemblies are detailed in section 3.0. Because the 110A-FB incorporates a non-modular control circuit,
there is no section 2 in this manual.

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

HIGH

LOW

FAULT

MODEL 110A-FB

ppm / %

SPECIFIC

GAS

MONITOR

HIGH

ALARM

SET

LOW

ALARM

SET

HIGH

ALARM

LOW

ALARM

NL

NL

detcon inc.

TEXASHOUSTON

1.1 DESCRIPTION

Detcon Model 110A-FB 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/or 24 VDC unless
otherwise specified at time of order.

The control enclosure includes, as standard operating controls (see figure #1); 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 in,
sensor terminations, 4-20 madc 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.

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

Fig. #1

Operating

Controls & Terminals

1 Amp slow blow fuse
is mounted on power supply.

DISPLAY ZERO

4-20 MA SPAN

4-20 MA ZERO

SPECIFIC

GAS

MONITOR

ppm / %

FACTORY SET

MODEL 110A-FB

HIGH

LOW

FAULT

detcon inc.

HIGH

ALARM

NON-LATCH

LATCH LATCH

JP1

JP2

AUX DC

Fuse

1 AMP

ON

SW1

Power

OFF

L1L2

117

VAC

IN

HIGH

ALARM

SET

SW1 SW2 SW3 SW4

0

0

1

1

2

2

3

3

4

4

5

5

9

9

6

6

8

8

7

7

LEAST SIGNIFICANT DIGIT

MOST SIGNIFICANT DIGIT

Micro Fuses

Sensor

FLT

Powe r

5 AMP

1/2 AMP

C

AUX 24

SENSOR

VDC IN

FAULTFAULT LOW HIGH 4-20

TEXASHOUSTON

ALARM

0

9

8

7

MSD LSD

LOW

5 AMP

C

NCNO

JP5
Power Sense
Bypass Jumper

LOW

SET

0

1

1

2

2

3

3

4

4

5

5

9

6

6

8

7

HIGH

5 AMP

C

NCNO

NCNOMA

LOW

ALARM

NON-LATCH

JP3

JP4

ALARM FIRING DIRECTION
ASCENDING >; DECENDING <

PUSH

ALARM

ABLE

ALARM
RESET

ALARM

DISABLE

ALARM

RESET

OUT

DISABLE

INDICATOR

LED

1.2 PROGRAMMING THE 110A-FB

The 110A-FB 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 (see figure #1). 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 screwdriver, 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 is
25, 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 (see figure #1). 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
conditions (as in oxygen deficiency monitoring). To program, refer to JP3 - Low; and JP2 - High (see figure
#1). 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 (<).

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 (see figures #1 and #2).

1.7 ALARM RESET

The alarm reset switch located on the 110A-FB 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 (see figures #1 and #2).

1.8 REMOTE RESET

A remote mounted normally open momentary switch may be used to reset the Model 110A-FB controller.
The reset function is effective when the alarms have been programmed in the latching position and alarm
conditions have passed (see figures #1 and #2).

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 (see figures #1 and #2).

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 contains an internally mounted 24 VDC power supply that operates on 117 VAC.
Terminations are also provided on the motherboard for auxiliary DC input 20-28 VDC. A 1/2 amp 3AG

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

slow blow fuse mounted on the power supply protects against excessive line power (117 VAC). Excessive
DC current is protected by a 1 amp micro-fuse located on the motherboard (see figures #1 and #2).

1.11 FAULT CIRCUIT FUNCTIONS

Model 110A-FB 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

Detcon Model 110A-FB Gas Detection System PG.5

Fig. #2

Motherboard Schematic Diagram

POWER SUPPLY

1

L1 IN

R1
1K

RED
CR1

3

2

Transformer

4

+DC OUT

+DC

3

4

L2 IN

COM

1A
F6

D5

4001

D6

SA30CA

PLUG

COM

1

2

1 AMP
SLOW
BLOW

+ OUT +S - OUT -S

ALARM

DISABLE

SW2

D4

F1
JUMP

SW1

POWER

4001

F2
1/2A

Sensor Power

5 7 9

D1

K1

4

5

1

F3

F3
5A

5A

Fault

5

2

1

3

F4
5A

D2

K2

Low

D3

K3

4

2

3

4

5

2

1

3

High

F5
5A

61211

8

RESET

SW3

ORANGE CONNECTOR

C

MA

NCCNO

NO

FAULT LOW HIGH

NCCNO

NC

4-20MA

REMOTE

RESET

RIBBON CONNECTOR

L1 L2

VAC

IN

VDC

IN

SENSOR

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 (see figures
#1 & #2).

Power Sense Bypass

When a sensor from the Detcon DM series or IR series is used with the Model 110A-FB controller, the power
sense bypass jumper must be installed on JP5 to prevent a false fault alarm. This jupers purpose is to bypass
the heater/bridge fault detection circuitry which is not needed when used with Detcon oxygen, toxic or
infrared gas sensors

. To install the jumper, remove the 4 screws that secure the face plate to the circuit

board, lift off the face plate, place the jumper on JP5 and then reinstall the face plate (reference fig. #1).

1.12 INSTALLATION

01. Securely mount the 110A-FB enclosure (see figure #3).

02. Connect 117 VAC input wiring to the lugless terminal strip (labeled VAC IN) on the controller mother

board (see figure #4). Line power current load is maximum 1/5 amp.

Detcon Model 110A-FB Gas Detection System PG.6

Fig. #3

Dimensions/Mounting Detail

.312" DIA. MOUNTING HOLE

11.625"

10.75"

6"

4.25"

9.75"

03. If applicable, connect the 24 VDC standby battery to the lugless terminal strip (labeled VDC IN) on the

controller motherboard (see figure #4). The DC current load is a maximum 1 amp.

Caution: Observe correct polarity when terminating all input/output field wiring. Failure to do so may
result in circuit damage on power up.

04. If applicable, connect a normally open momentary remote mounted switch to the lugless terminal strip

(labeled RESET) located on the controller motherboard (see figure #4).

05. 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 lugless terminal strips located on the controller
motherboard (see figure #4).

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.

1.13 START-UP

Upon completion of all field wiring, turn the unit on via the power switch located on the motherboard (see
figure #1). Note that the 110A-FB digital display illuminates. Varying readings may occur during sensor
warm-up. A 10 second alarm delay will occur on power up.

Detcon Model 110A-FB Gas Detection System PG.7

Fig. #4

Wiring Detail

117

VAC IN

L1L2

AUX 24
VDC IN

SENSOR

External Alarm Reset Switch
Normally Open Momentary

ALARM CONTACTS

Common, Normally Open

and Normally Closed

FAULT LOW HIGH

C

C

NCNO

NCNO

MA

–
+

C

NCNOMA

4-20MA

24VDC

4-20
madc
OUT

RESET

Typical Sensor

Refer to section 3.0 for additional sensor start-up detail.

1.14 SPECIFICATIONS

Range: 0-99 ppm/% (see section 3.0 for specific gas range)
Accuracy/Reproducibility: ± 1% F.S.
Operating Temperature: –40° F to +175° F
Input Power: 117 VAC/ 24 VDC
Power Consumption: max 6 watts
Warranty: one year
Outputs: 4-20 madc

1.15 ORDER GUIDE

Part # Model # Range Gas Type

954-520050-099 CG-110FB 0-99 % LEL combustible gas
954-010050-099 HS-110FB 0-99 PPM Hydrogen Sulfide
954-340050-025 O2-110FB 0-25 % Oxygen Deficiency
954-EA0050-099 C2H30-110FB 0-99 PPM Acetyldehyde
954-EG0050-099 C2H2-110FB 0-99 PPM Acetylene
954-EM0050-099 C3H3N-110FB 0-99 PPM Acrylonitrile
954-000050-099 NH3-110FB 0-99 PPM Ammonia
954-190050-1X0 AsH3-110FB 0-1 PPM Arsine
954-750050-5X0 Br2-110FB 0-5 PPM Bromine
954-EB0050-099 C4H6-110FB 0-99 PPM Butadiene
954-400050-1X0 C02-110FB 0-1 % Carbon Dioxide
954-EH0050-099 CS2-110FB 0-99 PPM Carbon Disulfide
954-EN0050-099 COS-110FB 0-99 PPM Carbonyl Sulfide
954-440050-099 CO-110FB 0-99 PPM Carbon Monoxide
954-740050-9X9 CL2-110FB 0-9.9 PPM Chlorine
954-760050-1X0 CLO2-110FB 0-1 PPM Chlorine Dioxide
954-210050-5X0 B2H6-110FB 0-5 PPM Diborane
954-EC0050-099 C2H6S-110FB 0-99 PPM Dimethyl Sulfide
954-EI0050-099 C3H5OCL-110FB 0-99 PPM Epichlorohydrin
954-EZ0050-099 C2H5SH-110FB 0-99 PPM Ethyl Mercaptan
954-EO0050-099 C2H5OH-110FB 0-99 PPM Ethanol
954-ED0050-099 C2H4-110FB 0-99 PPM Ethylene
954-EJ0050-099 C2H4O-110FB 0-99 PPM Ethylene Oxide
954-270050-1X0 F2-110FB 0-1 PPM Fluorine
954-EP0050-099 CH20-110FB 0-99 PPM Formaldehyde
954-250050-2X0 GeH4-110FB 0-2 PPM Germane
954-260050-1X0 N2H4-110FB 0-1 PPM Hydrazine
954-840050-099 H2-110FB 0-99 PPM Hydrogen
954-050050-099 H2-110FB 0-99 % LEL Hydrogen
954-080050-030 HBr-110FB 0-30 PPM Hydrogen Bromide
954-140050-030 HCL-110FB 0-30 PPM Hydrogen Chloride
954-040050-030 HCN-110FB 0-30 PPM Hydrogen Cyanide
954-330050-9X9 HF-110FB 0-9.9 PPM Hydrogen Fluoride
954-010050-099 H2S-110FB 0-99 PPM Hydrogen Sulfide
954-EE0050-099 CH30H-110FB 0-99 PPM Methanol
954-EK0050-099 CH3SH-110FB 0-99 PPM Methyl Mercaptan
954-940050-099 NO-110FB 0-99 PPM Nitric Oxide
954-640050-5X0 NO2-110FB 0-5 PPM Nitrogen Dioxide
954-390050-1X0 O3-110FB 0-1 PPM Ozone
954-410050-1X0 COCL2-110FB 0-1 PPM Phosgene
954-200050-5X0 PH3-110FB 0-5 PPM Phosphine

Detcon Model 110A-FB Gas Detection System PG.8

Part # Model # Range Gas Type

954-230050-050 SiH4-110FB 0-50 PPM Silane
954-540050-020 SO2-110FB 0-20 PPM Sulfur Dioxide
954-430050-099 C4H8S-110FB 0-99 PPM Tetrahydrothiophene
954-EQ0050-099 C4H4S-110FB 0-99 PPM Thiophane
954-ER0050-099 C6H5CH3-110FB 0-99 PPM Toluene
954-EF0050-099 C4H6O2-110FB 0-99 PPM Vinyl Acetate
954-EL0050-099 C2H3CL-110FB 0-99 PPM Vinyl Chloride

1.16 WARRANTY

Detcon, Inc., as manufacturer, warrants under intended normal use, each new Model 110A-FB 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.

1.17 MAINTENANCE (No special tools or test equipment required.)

TOOLS REQUIRED

01. Jeweler‘s screwdriver

02. Medium size phillips screwdriver

03. Medium size standard head screwdriver

04. Digital volt/ohm meter

DISPLAY ZERO

The potentiometer labeled "Display Zero" is used to calibrate the digital display in accordance with the 4-20
madc signal input (see figure #1). This is factory set and should not require any user adjustment. Should
fine tuning become necessary, the display should be calibrated to read "01" with a signal input of 4.16
madc.

ANALOG 4-20 MA OUTPUT CALIBRATION

The 110A-FB, 4-20 madc output is factory calibrated and tested prior to shipment and should not require
field level adjustment (see figure #1). Should fine tuning become necessary, the digital to analog converter

is calibrated via the 4-20 MA Span and Zero potentiometer. A zero signal input of 4 milliamps should be
matched at the signal output via the ZERO potentiometer. A span signal input of 20 milliamps should be
matched at the signal output via the SPAN potentiometer.

1.18 TROUBLE SHOOTING

FAULT INDICATOR LIGHT IS ON

01. Verify power is going out to the sensor. Using the volt/ohm meter measure 24 VDC across "+" and "–"

SENSOR terminals on the controller motherboard (see figure #4). If there is not 24 VDC, remove and
check sensor fuse (F2) for continuity (see figures #1 & #2). If open, replace with 1/2 amp micro fuse
(see parts list).

02. Verify that the 3 conductor cable from the controller to the sensor is not broken or shorted.

03. Verify that the controller is receiving a 4-20 madc signal from the sensor by placing the volt/ohm meter

in series with the signal wire "MA" and measuring a signal greater than 3.5 madc but less than 20 madc.
If out of this range, the sensor may be bad. Check sensor trouble shooting procedure in section 3.0.

DISPLAY DOES NOT LIGHT UP

01. Verify that the controller motherboard is receiving 117 VAC across terminals L1 and L2.

02. Verify that the power switch is "ON".

03. Verify that the power supply fuse is not open. First turn off the power switch. Next, remove the front

plate, the control circuit and the ribbon cable (see figure #5). Remove the power supply fuse (see figure
#6) and measure for continuity. If open, replace with 1/2 amp 3AG slow blow fuse (see parts list).

04. Verify that the power supply is outputting 24 VDC. First turn off the power switch. Next, remove the

Detcon Model 110A-FB Gas Detection System PG.9

front plate, the control circuit and the ribbon cable (see figure #5). Turn the power switch back on and
measure the VDC output on the power supply on the terminals labeled "+ OUT" and "– OUT" (see fig­ure #6). If you do not measure between 22 VDC and 28 VDC, replace the power supply as shown in the
breakaway drawing figure #5.

05. If operating by auxiliary DC power, verify that the AUX DC fuse is not open (see figure #1) by remov-

ing it and measuring for continuity. If open, replace with 1 amp micro fuse (see parts list).

ALARMS ARE NOT ACTIVATING

01. If external alarm devices are not working properly, verify that their corresponding fuses are not open

by removing them from the motherboard (see figure #1) and checking for continuity. Fault, Low and
High alarms all use 5 amp micro fuses (see parts list).

MISCELLANEOUS

01. If other problems exist, return the 110A-FB for repair or replacement as discussed in section 1.16 of this

manual or replace damaged components according to the breakaway drawing figure #5. Refer to parts
list for part numbers.

Detcon Model 110A-FB Gas Detection System PG.10

Fig. #5

Breakaway Detail

6-32 x 5/16

Screw Typ.

110A-FB Front Plate PN8108

6-32 x 5/16
Screw Typ.

110A-FB Control Circuit Assembly
PN5405

110A-FB Power

Supply Assembly

PN3605

6-32 x 5/16
Screw Typ.

Orange
Connector

Ribbon
Connector
PN9874

110A-FB Motherboard Assembly
PN5406 - Includes Power Supply

1.19 PARTS LIST

VEND # DESCRIPTION QTY RQD ORIG. MFG ORIG. MFG # STD QTY LEAD PRICE

0224 gold plated jumper tab 4 Samtec SNT-100-BKG 1 3 weeks
0290 1/2 amp micro fuse 1 Little Fuse 273.500 5 3 weeks
0292 1 amp micro fuse 1 Little Fuse 273001 5 3 weeks
0295 5 amp micro fuse 3 Little Fuse 273005 5 3 weeks
0297 1 amp 3AG slow blow fuse 1 Little Fuse 313001 5 3 weeks
3597 110A-FB power supply assy. 1 Detcon Inc. 3597 1 3 weeks
5406 110A-FB motherboard assy. 1 Detcon Inc. 5406 1 3 weeks
5405 110A-FB control circuit assy. 1 Detcon Inc. 5405 1 3 weeks
8108 110A-FB front plate 1 Detcon Inc. 8108 1 3 weeks

All prices are subject to change without notice.

Maximum allowable operating time - not applicable
Contract turnaround time for overhaul - not applicable
Failure rate data - not applicable

Detcon Model 110A-FB Gas Detection System PG.11

1/2 Amp Slow Blow Fuse

Fig. #6

Power Supply

PN0297

24 VDC Output Terminals

+ OUT

– OUT

110A-FB Power Supply
PN3506

AUX DC

Fuse

1 AMP

PN0292

L1L2

117

VAC IN

AUX 24
VDC IN

Sensor

Powe r
1/2 AMP
PN0290

Micro Fuses

FLT

LOW

5 AMP

5 AMP

PN0295

PN0295

C

C

SENSOR

NCNO

FAULTFAULT LOW HIGH 4-20

HIGH

5 AMP

PN0295

NCNO

C

RESET

NCNOMA

OUT

Detcon Model 110A-FB Gas Detection System PG.12

Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands, Texas 7381

Mailing Address: P.O. Box 8067, The Woodlands, Texas 77387-8067

phone [phone] • fax [phone] • www.detcon.com • [e-mail]

1.20 RECOMMENDED SPARE PARTS FOR 1 YEAR

VEND # DESCRIPTION QTY RQD ORIG. MFG ORIG. MFG # STD QTY LEAD PRICE

0290 1/2 amp micro fuse 5 Little Fuse 273.500 5 3 weeks
0292 1 amp micro fuse 5 Little Fuse 273001 5 3 weeks
0295 5 amp micro fuse 5 Little Fuse 273005 5 3 weeks
0297 1 amp 3AG slow blow fuse 5 Little Fuse 313001 5 3 weeks

Detcon Model 110A-FB Gas Detection System PG.13