INSTRUCTION MANUAL
Detcon Model 971-071170-0DL
SAMPLE
PORT
detcon, inc.
HOUSTON,TEXAS
SAMPLE DRAW
GAS DETECTION SYSTEM
FLOW FAULT
FLOW FAULT
CAL PORT
SAMPLE
SET
FLOW
SET
AIR
FLOW
MODEL
PI-700
PGM1
ZERO
VOC Sensor
POWER
ON/OFF
PGM2
SPAN
The Woodlands, Texas 77387
Ph.281.367.4100 / Fax 281.298.2868
June 15, 2009 • Document #3483 • Revision 2.0
DETCON, Inc.
3200 Research Forest Dr,
www.detcon.com
Model 971-071170-0DL
This page left intentionally blank
Model 971-071170-0DL ii
Model 971-071170-0DL
Table of Contents
1. Introduction ..................................................................................................................................................1
2. Installation ....................................................................................................................................................1
2.1 Mounting............................................................................................................................................. 1
2.2 Sampling connections ......................................................................................................................... 2
2.3 Electrical connections ......................................................................................................................... 3
2.4 Relays and RS 485 Setup.................................................................................................................... 3
3. Start Up.........................................................................................................................................................4
3.1 Flow Fault Detection........................................................................................................................... 4
4. Calibration ....................................................................................................................................................4
5. Spare Parts ....................................................................................................................................................6
6. Specifications ...............................................................................................................................................6
6.1 Sample Draw....................................................................................................................................... 6
6.2 Sensor Assembly................................................................................................................................. 6
7. Warranty .......................................................................................................................................................6
8. Flow Diagram...............................................................................................................................................7
9. Wiring Diagram............................................................................................................................................8
Table of Figures
Figure 1 Sample Draw dimensions ...................................................................................................................... 1
Figure 2 Dilution Flowmeter Bracket .................................................................................................................. 2
Figure 3 Sensor assembly vent port ..................................................................................................................... 2
Figure 4 Customer wiring diagram ...................................................................................................................... 3
Figure 5 Calibration setup .................................................................................................................................... 5
Model 971-071170-0DL iii
Model 971-071170-0DL
This page left intentionally blank
Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands Texas 77381
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 •
Model 971-071170-0DL iv
www.detcon.com • sales@detcon.com
Model 971-071170-0DL
1. Introduction
The Detcon Model 971-071170-0DL is an 117VAC powered gas detection system that provides a
remote gas sample to an independent sensor assembly with ability to dilute the gas sample with air. The
sensor assembly, discussed in the attached sensor manual, is specified at time of order as to gas and range of
detection and other options. The NEMA 7X rating is by definition explosion proof and therefore is suitable
for outdoor location in electrically hazardous environments.
The enclosure houses a 24 VDC power supply, flow pump and flow fault detection circuit. The
motherboard provides field wiring terminals which, depending on the type of sensor used, include options for:
117 VAC power input, 24 VDC battery backup power input, 4-20 mA signal output, alarm relay dry contacts,
and RS-485 Serial communications. Internal panel mount fuses are provided for VAC and VDC power.
A power switch, power indicator lamp and a flow fault indicator lamp are mounted on the hinged door.
Externally mounted flow controls include a selector valve for sample and calibration, a sample flow meter
with an adjustable valve. This model also provides a flow meter with adjustable valve that provides a
selectable air dilution flow. An externally mounted moisture filter is provided for the gas sample input.
2. Installation
2.1 Mounting
Securely mount the enclosure in accordance with the drawing below Figure 1.
MODEL
MODEL
PI-700
PI-700
PGM1
PGM1
ZERO
ZERO
VOC Sensor
VOC Sensor
PGM2
PGM2
SPAN
SPAN
Vent Port
Figure 1 Sample Draw dimensions
971-071170-0DL Instruction Manual Rev. 0.0 Page 1 of 8
Model 971-071170-0DL
2.2 Sampling connections
1. Install a length of tubing from the desired sample point to the sample port as shown in.
Sample draw tubing should be either Teflon or stainless steel 1/4" OD. Sample flow rates are
set between 500 and 1000 ml/m.
Note: When detecting for NH3, CL2, CLO2, or HCL care must be taken to use a minimum amount of
stainless steel tubing and connections because stainless steel readily absorbs these gasses and will
cause significant error in the detection process. Teflon tubing is recommended for these applications.
SAMPLE
PORT
Sample
Port
detcon, inc.
HOUSTON,TEXAS
SAMPLE DRAW
GAS DETECTION SYSTEM
SET
SAMPLE
FLOW
250
200
150
100
50
0
2.0
1.8
1.6
1.4
1.2
1.0
SET
0.8
AIR
FLOW
0.6
0.4
0.2
0
CAL PORT
Figure 2 Dilution Flowmeter Bracket
2. Install a length of tubing from the vent port and an area deemed safe for vent as shown below.
MODEL
MODEL
PI-700
PI-700
PGM1
PGM2
PGM1
PGM2
ZERO
ZERO
SPAN
SPAN
VOC Sensor
VOC Sensor
Vent Port
Figure 3 Sensor assembly vent port
971-071170-0DL Instruction Manual Rev. 0.0 Page 2 of 8
Model 971-071170-0DL
Note: Observe correct polarity when terminating all input/output wiring. Failure to do so
may result in circuit damage on power up. See the field wiring diagram below for terminal
locations.
2.3 Electrical connections
1. Connect 117VAC to the connector labeled “117VAC IN”.
2. If applicable, connect 24 VDC battery backup to the connector labeled “24 VDC IN”.
3. If applicable, connect a remote recording device or computer to the 4-20 mA signal output connector.
The terminals are labeled SENSOR “–” and “mA”.
Two discrete form C dry contacts
are provided (set 2 and 3) by the
FLOW
FAULT
CONTACTS
FLOW
FAULT
CIRCUIT
flow fault circuit for alarm devices.
The first set of contacts (1) are
pre-wired to interrupt the 4-20 mA
signal output in the event of a
"flow fault". This will allow for
flow fault monitoring at any
controller / computer that the
signal is wired to.
4-20
mA
Wire alarms and the 4-20mA output
signal to the plug connectors
FLT ALM 1
ALM 2
RS-485 #1
J2J1
COM
Wire 117VAC & optional
24 VDC backup to the
designated connectors
D1
P5
L1
L 2
117 VACIN24 VDC
IN
Battery
Backup
COM
P6
C
NO/NC C NO/NC C NO/NC
SENSOR #1
FAULT
ALARM CONTACTS #1
NO/NC
NO/NC
ALARM 1 ALARM 2
COM
NO/NC
P9P8P7
RS-485 #1
SHLD
Figure 4 Customer wiring diagram
2.4 Relays and RS 485 Setup
1. If applicable, connect alarm devices. Discrete alarm relay contacts are provided for three alarms:
Fault, Low, and High. The contacts consist of common and choice of normally open or normally
closed. Contact output selections are jumper programmable on the sensor connector board. See the
sensor manual for contact ratings and other information.
2. If applicable, connect flow fault alarm wiring. Two sets of form C contacts (common, normally open
and normally closed) are provided. Relay contacts are rated 1 amp at 30VDC/.24 amp at 125VDC.
3. If applicable, connect RS-485 wiring. The RS-485 requires 24 gauge, two conductor, shielded,
twisted pair cable between sensor and host PC. Use Belden part number 9841. Two sets of terminals
are located on the connector board to facilitate serial loop wiring from sensor to sensor. Wiring
designators are +, –, and shield.
971-071170-0DL Instruction Manual Rev. 0.0 Page 3 of 8
Model 971-071170-0DL
3. Start Up
Upon completion of all tubing connections and field wiring turn on the power switch located on the enclosure
door. Note that the power lamp illuminates. If applicable, note that the sensor LCD indicator activates.
Varying readings may occur during sensor warm-up. Allow approximately 1 hour to stabilize (24 hours is
best).
Set sample flow through the flow meter. Adjust the sample flow meter as necessary to achieve the desired
dilution. Adjust the air flow meter as necessary to achieve the desired dilution. Assure that all field tubing
connections are secure by obstructing the end of the sample line and observing that the flow meter decreases to
“0” flow.
3.1 Flow Fault Detection
Flow fault detection consists of a flow fault circuit assembly located inside the enclosure and a door mounted
fault indicator lamp. If the diluted air/sample mixture flow falls below a predetermined set point the following
will occur: the flow fault alarm relays will energize; an LED indicator mounted on the flow fault PCB will
illuminate; the door mounted flow fault lamp will illuminate; the 4-20mA signal will be opened via relay #1 on
the flow fault circuit board (this will allow for flow fault programming at the remote recording device or
computer.
Because the pressure inside the sample and vent flow tubing differs according to the tubing length, the flow
fault circuit will require calibration after installation.
To calibrate the flow fault circuit, first determine at what point it is desired that the flow fault circuit is
activated. Typically, air flow should range between 500 and 1000 ml/min. (milliliters per minute) as seen on
the flow meter located on the left of the enclosure. It is recommended that the flow fault circuit be set to
activate at a flow of approximately 300 ml/m.
To adjust the flow fault:
1. Set the air flow at the point where you want the fault condition to activate.
2. Turn the flow fault adjust potentiometer (PT1 as seen in the illustration on the previous page)
clockwise until the flow fault LED illuminates and its relays fire. Make adjustments as necessary by
increasing and decreasing airflow until the flow fault function occurs at the desired set point. Once the
flow fault circuit has been set, return the air flow to between 500 and 1000 ml/m.
Note: Because sample and vent tubing can become congested over a period of time, the flow
fault function should be checked periodically and adjusted if necessary.
4. Calibration
Model 971-071170-0DL Sample draw with sensor assembly is calibrated prior to shipment and should
therefore require minimal adjustment at time of commissioning. However, it is recommended that a complete
calibration be performed on a periodic basis to assure optimum system performance. Refer to the sensor
instruction manual for gas type, range, and sensor specific calibration instructions. Note that the sensor
instruction manual requires the removal of rain/splash guards for the application of gas. This requirement will
be superseded by the instructions below. The calibration adapter attached to the sensor head should not be
removed during calibration.
971-071170-0DL Instruction Manual Rev. 0.0 Page 4 of 8
Model 971-071170-0DL
Note: It is critical that air dilution be set in coordination with the entry value for AutoSpan.
The air dilution used during span calibration must be maintained as a constant or calibration
will drift. If air dilution ratio is changed, span calibration must be repeated.
Fixed Flow
Regulator
1000
ml/min
6" of vent tube
500 ml/min
SAMPLE
PORT
Teflon tubing
detcon, inc.
HOUSTON,TEXAS
SAMPLE DRAW
GAS DETECTION SYSTEM
CAL PORT
250
2.0
1.8
200
1.6
1.4
150
1.2
SET
SAMPLE
FLOW
1.0
100
0.8
0.6
50
0.4
0.2
0
0
CALIBRATION
PORT
SET
AIR
FLOW
Span Gas
Cylinder
Figure5 Calibration setup
Required material:
1. Span gas cylinder containing gas as per instructions in the sensor instruction manual.
2. 1/4" Tee tubing fitting as shown in .
Figure5
To Calibrate: (refer to Figure5)
1) Turn the 3-way valve so that the arrow is pointing down. Sample is now being drawn from the CAL port.
2) a) Using the 1/4" Tee assembly, connect the span gas cylinder to the calibration port. Note that the
cylinder flow rate should be 1000 ml/m while the sample draw flow rate should be adjusted from 100- 500
ml/m. This will assure that the sample is not diluted. Be sure to add the 6” vent tubing as shown to
prevent dilution.
b) Make sure air dilution flow is set to target level according to customer’s requirement.
3) Follow the calibration instructions given in the sensor instruction manual.
4) Close cylinder valve to allow clearing/zero stability. Note that zero and span functions may interact
slightly with one another. Zero and span tests may be repeated 2 or 3 times as necessary.
5) When calibration is complete turn the 3-way valve so that the arrow is pointing up.
971-071170-0DL Instruction Manual Rev. 0.0 Page 5 of 8
Model 971-071170-0DL
5. Spare Parts
Part# Description
325-400000-000 XHSSS CAM1 Explosion proof switch less contacts
3254-BT2 2 normally-open contact set for Explosion proof switch
283-1G0000-000 Power indicator lamp
283-1R0000-000 Flow fault indicator lamp
500-005151-002 Flow fault circuit assembly
351-011211-024 Dilution sample draw Pump 24VDC
350-009225-610 2000 ml/m flow meter with valve (air flow)
350-011210-610 250 ml/m flow meter with valve (sample flow)
360-6SD1SD-200 117VAC to 24VDC power supply assembly
823-600000-000 Moisture Knockout Assembly
6. Specifications
6.1 Sample Draw
Electrical Classification NEMA 7 Explosion Proof
Dimensions 19.5"W x 22"H x 10"D
Power Input 110-VAC Standard
Operating Temperature Range -40°C to +65°C; -40°F to +149°F
Warranty One year
6.2 Sensor Assembly
See Sensor Manual
7. Warranty
Detcon Inc., as manufacturer, warrants under intended normal use each new Model 971-071170-0DL Sample Draw to be
free from defects in material and workmanship for a period of one year from the date of shipment to the original
purchaser. Sensor assembly warranties are explained in their respective instruction manuals. All warranties and service
policies are FOB the Detcon Inc. facility located in The Woodlands, Texas.
971-071170-0DL Instruction Manual Rev. 0.0 Page 6 of 8
Model 971-071170-0DL
8. Flow Diagram
971-071170-0DL Instruction Manual Rev. 0.0 Page 7 of 8
Model 971-071170-0DL
9. Wiring Diagram
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 •
971-071170-0DL Instruction Manual Rev. 0.0 Page 8 of 8
Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands Texas 77381
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
www.detcon.com • sales@detcon.com
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