Dwyer | Series GSTA | Instruction manual | Series GSTA Carbon Monoxide/Nitrogen Dioxide Gas Transmitters Bulletin AQ-GSTA

Series GSTA Carbon Monoxide/Nitrogen Dioxide Gas Transmitters Bulletin AQ-GSTA
Bulletin AQ-GSTA
Series GSTA Carbon Monoxide/Nitrogen Dioxide Gas Transmitters
Specifications - Installation and Operating Instructions
3-45/64
[94.06]
3-1/8
[107.95]
3-23/64
[85]
2-55/64
[73]
2-15/64
[57]
2-15/64
[56.75]
4-17/32
[115.09]
5-7/64
[129.78]
Wall Mount
The Series GSTA Carbon Monoxide/Nitrogen Dioxide Transmitters monitor the
gas concentration in underground parking garages and loading docks. Carbon
monoxide is commonly used to measure the exhaust of gasoline engines, while
nitrogen dioxide is used for diesel engines. Field selectable current and voltage outputs
allow the transmitter to be used with almost any building management controller. For
carbon monoxide units, the user can adjust the output range to be 0 to 50 ppm up to
0 to 599 ppm. Nitrogen dioxide units come with a standard 0 to 10 ppm range. The
output can be inverted to read 20 to 4 mA or 10 (5) to 0 VDC using internal dip switches.
To maximize the accuracy of the Series GSTA, the sensor can be field-calibrated
using the A-449 remote LCD display. When the sensor reaches the end of its life, the
display will indicate that the sensor needs to be replaced.
WARNING
Disconnect power supply before installation to prevent
electrical shock and equipment damage. Make sure all
connections are in accordance with the job wiring diagram and in accordance with
national and local electrical codes. Use copper conductors only.
CAUTION
Use electrostatic discharge precautions (e.g., use of wrist
straps) during installation and wiring to prevent equipment
damage.
CAUTION
Avoid locations where severe shock or vibration, excessive
moisture or corrosive fumes are present.
CAUTION
Do not exceed ratings of this device, permanent damage not
covered by warranty may result. The 4 to 20 mA models are not
designed for AC voltage operation.
INSTALLATION
NOTICE
These are general guidelines. Local laws or ordinances will take
precedence.
• The transmitter should be mounted at normal breathing height, approximately 5
to 6 ft above the floor.
• The unit may be mounted in the horizontal or vertical position. It should be
mounted in an area that is shielded from direct contact with the elements or
direct sunlight.
• Mount in an area that will prevent the sensor from having any direct contact with
water.
• The unit should be placed in an area that will give an average of the air quality.
Do not place the unit so it will receive direct engine exhaust. Prolonged
exposure to direct engine exhaust may damage the sensor.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
3-59/64
[100]
Duct Mount
SPECIFICATIONS
Sensor: Field replaceable electrochemical, 4 years typical lifespan.
Range:
CO: selectable 0-50 ppm up to 0-500 ppm;
NO2: 10 ppm.
Output Drift: <5% per year in air.
Coverage Area: 5000 to 7500 sq ft typical.
Accuracy: CO: 2%, NO2: 3% at the time of calibration.
Resolution: CO: 1 ppm; NO2: 0.1 ppm.
Temperature Range: -4 to 122°F (-20 to 50°C).
Storage Temperature: For best sensor life, 32 to 68°F (0 to 20°C).
Humidity Limits: 15 to 90% RH constant; 0 to 99% RH intermittent.
Response Time: <45 seconds to 90% CO, <25 to 90% NO2.
Span and Zero Adjustment: Via pushbutton, using optional A-449 display.
Housing: UV resistant glass filled polycarbonate.
Output:
Switch selectable 4 to 20 mA (loop powered), 0 to 5 V @ 5 mA, or 0 to 10 V @
5 mA;
Switch selectable 0 to 5 V / 1 to 5 V and 0 to 10 V / 2 to 10 V;
Switch selectable normal or reverse output.
Power Supply:
Current output: 10 to 35 VDC;
Voltage output: 15 to 35 VDC or 15 to 29 VAC.
Electrical Connection: Removable terminal block, knock outs for conduit fitting.
Calibration: Via pushbuttons using A-449 auxiliary display. Span gas
concentration is field selectable.
Weight: 1 lb (.45 kg).
Agency Approval: CE.
MOUNTING
1. Remove the cover plugs from the face of the unit and the top cover.
2. Disconnect the display cable from the USB connector on the main circuit board
(if present).
3. Remove the desired conduit fitting knock out and install conduit fitting (not
provided).
4. Position the transmitter where it is to be mounted and mark the mounting holes
in each corner of the housing.
5. Drill or punch out marked locations.
6. Place the transmitter box over mounting holes on wall and align. Install wall
mount screws (not provided) in mounting holes.
7. Proceed with wiring according to Figures 1 and 2.
8. Set DIP SWITCH and IOUT/VOUT SWITCH as desired. Refer to Figure 3.
9. Reconnect the LCD cable to the USB port on the main circuit board (if present).
10. Replace cover and cover plugs on the face of the unit.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: info@dwyer-inst.com
DUCT MOUNTING
Duct mounting kit includes an air flow pitot tube, air filter with barbed connections,
two short pieces of tubing and one long piece of tubing.
CURRENT/VOLTAGE
SELECT SWITCH
MENU SWITCHES
UP = ON
SPAN
DIGI T
ZERO
VALUE
W
ON
C
R
1
2
3
DIP SWITCH
USER ADJ (RANGE, PPM)
IN V (O U T P U T )
IOUT
DOWN = OFF
1 2 3 4
O N (0 S U P P )
5V
VOUT
200
NO RM
OFF
10V
1. Mount the pitot tube into the duct observing the flow direction marked on the
pitot tube.
2. Attach the two short pieces of tubing to the barbed connections on each side of
the air filter.
3. Attach the remaining side of one of the short pieces of tubing to the barbed
connection on the transmitter.
4. Attach the remaining side of the other short piece of tubing to the high port on
the pitot tube.
5. Attach the long piece of tubing to the open barbed connection on the transmitter.
6. Attach the other end of the long tubing to the low port on the pitot tube.
SWITCH LOCATIONS
4
S1
SENSOR
Figure 3
Setting the Current/Voltage Select Switch
To access the current/voltage select switch, remove the cover of the unit. The
current/voltage select switch is located on the circuit board as shown in Figure 3.
Set the switch to ˝IOUT˝ for current, ˝VOUT˝ for voltage.
WIRING
Use maximum 18 AWG wire for wiring terminals. Refer to Figure 1 or Figure 2 for
wiring information. The terminal block is removable for ease of installation.
Wiring for 4 to 20 mA Output
4 to 20 mA output units may be powered by 10 to 35 VDC.
1
2
3
+
-
RECEIVER
-
Menu Function (CO Model only)
DIP SWITCH #4 OFF: User ADJ (Output Range)
DIP SWITCH #4 ON: Sensor calibration/range = 200 ppm
Wiring for 0 to 5 or 0 to 10 V output
The 0 to 5 or 0 to 10 V units may be powered by 15 to 35 VDC or 15 to 29 VAC.
Note polarity when using DC power. The maximum load is 5 mA
(1 K ohms for 0 to 5 V or 2 K ohms for 0 to 10 V).
-
3
+
-
RECEIVER
Figure 2
+
5 V / 10 V Output Select (Applies only to Voltage Output)
DIP SWITCH #1 OFF: Output = 0 to 5 V
DIP SWITCH #1 ON: Output = 0 to 10 V
Output Normal or Invert
DIP SWITCH # 3 OFF: Output is inverted
DIP SWITCH # 3 ON: Output is normal
Figure 1
V OUT WIRING
1 2
POWER
SUPPLY
ALL DIP SWITCHES ARE FACTORY SET TO “ON”.
Zero Suppression (Applies only to Voltage Output)
DIP SWITCH #2 OFF: Output range = 1 to 5 V or 2 to 10 V, depending on output
range
DIP SWITCH #2 ON: Output range = 0 to 5 V or 0 to 10 V, depending on output
range
I OUT WIRING
4
POWER
SUPP LY
+
DIP SWITCH Settings
To access the DIP SWITCH, remove the cover of the unit. The DIP SWITCH is
located on the circuit board as shown in Figure 3.
4
To
Calibration Gas
A-507
Calibration
Adapter
A-449
Display
Figure 4
VIEWING THE RANGE
NOTE: Requires auxilary display
A-449. Hook up as shown in Figure
4. Upon power up the unit will
momentarily display the range.
SPAN
DIGIT
ZERO
VALUE
Press the digit key to
scroll through the digits.
The digits will blink as
they are selected.
Adjust the value of
the digit using the
value key.
or
SPAN
DIGIT
The range can be
displayed at any time by
pressing the span key
for 5 seconds when
in the home position.
The range of the unit is factory set
to 200 ppm CO. Also, the range is
user adjustable to any value from
50 to 599 ppm CO. If dip switch is
set to User ADJ, the factory setting
is 100 ppm CO.
SPAN
DIGIT
When the desired
range has been selected,
press and hold the span
key until the lower
display reads "ADJ".
Then the display will
sequence to the home
position.
ZERO CALIBRATION
If the unit only requires zero calibration
place the unit in an area that contains
fresh air (no CO or NO2 gas).
ZERO
VALUE
SPAN AND ZERO CALIBRATION
In order to calibrate the span, hook up
a model A-449 auxilary display to the
unit as shown in Figure 4. If CO model,
set menu function switch to 200 ppm.
In the home position, the display reads
actual gas concentration.
SPAN ZERO
SETTING THE USER RANGE
NOTE: Requires auxilary display
A-449. Hook up as shown in Figure
4. Set output range switch to
"USER ADJ".
SPAN ZERO
DIGIT VALUE
Simultaneously
press span
and zero
buttons for 5
seconds until
the upper
display reads
"ADJ".
Press and hold the zero
key for 5 seconds.
Simultaneously
press span and
zero buttons for
5 seconds. The
lower display
reads “-0-”. The
upper display
reads “CAL”.
Place the unit in an area that contains
fresh air (no CO or NO2 gas). Allow 3
minutes to stabilize.
ZERO
VALUE
Press the zero key for 5
seconds, the unit will
sequence to span
calibration and display
the user set span
calibration gas value.
Factory setting is 200 ppm
for CO,10.0 ppm for NO2.
To adjust the display to set the
desired span gas calibration value:
SPAN
DIGIT
T
ZERO
VALUE
Press the digit key to
scroll through the digits.
The digits will blink as
they are selected.
Adjust the value of the
digit using the value key.
Hook the unit up to the span
calibration gas using calibration
adapter A-507 as shown in Figure 4.
Span gas flow is to be between
0.5 to 1.0 slpm (1 to 2 scfh). Allow
gas to flow for at least 3 minutes.
SPAN
DIGIT
Press and hold the span
key for 5 seconds.
Display reads “CAL OK” for 5
seconds, then returns to home
position.
If the sensor output is no longer
sufficient for calibration, then the
display reads “BAD SEN”. The
sensor must be replaced.
NOTE: In calibration mode, if no key
is pressed, then the unit will time out
and return to home position after 10
minutes.
When calibration is complete,
set menu function to 200 ppm or
USER ADJ as required.
Loop Resistance – The maximum allowable loop resistance depends on the
power supply voltage. Maximum loop voltage drop must not reduce the transmitter
voltage below the 10 VDC minimum. Maximum loop resistance can be calculated
with the following equation. Vps is the power supply voltage.
Sensor Replacement
A replacement sensor is available from Dwyer Instruments.
For CO, order part number: A-505
For NO2, order part number: A-506
WARNING
Sensors contain acid. Do not attempt to open sensors. Sensors
should be disposed of according to local laws.
Rmax =
Vps-10.0
20 mA
Replacing the Sensor
1. Remove the cover plugs from the face of the unit and top cover. Locate the
sensor, see Figure 3 – the sensor is mounted on three pin sockets. The circuit
board is labeled either “CO SENSOR” or “NO2 SENSOR” underneath the
sensor.
2. Remove and discard the sensor.
3. Remove the shorting wire spring located on the bottom of the new sensor.
4. Install the new sensor into the three pin sockets.
5. The unit must be re-calibrated whenever a new sensor is installed.
6. Allow 30 minutes for the unit to come to temperature equilibrium prior to
calibration. The unit has internal temperature compensation, and the sensor
must be at the same temperature as the unit to calibrate properly.
Some receivers, particularly loop powered indicators, may maintain a fixed loop
voltage to power the device. This voltage drop must also be subtracted from the
power supply voltage when calculating the voltage margin for the transmitter. The
following equation takes this into account. Vrec is the receiver fixed voltage.
TROUBLESHOOTING
MAINTENANCE
Upon final installation of the Series GSTA Transmitter and the companion receiver,
no routine maintenance is required with the exception of calibration. As with all
electrochemical type gas sensors, routine calibration is required. It is
recommended the unit be re-calibrated at 6 month intervals or as required by local
ordinances or other requirements.
Except for sensor replacement and calibration, the Series GSTA is not field
serviceable and should be returned if repair is needed (field repair should not be
attempted and may void warranty). Be sure to include a brief description of the
problem plus any relevant application notes. Contact customer service to receive a
return goods authorization number before shipping.
1. Verify that the unit is mounted in the correct position.
2. 4 to 20 mA Models: Verify appropriate supply voltage. The transmitter requires
a minimum of 10 and a maximum of 35 VDC at its connection for proper
operation. Choose a power supply with a voltage and current rating that meets
this requirement under all operating conditions. If the power supply is
unregulated, make sure voltage remains within these limits under all power line
conditions. Ripple on the supply should not exceed 100 mV.
©Copyright 2013 Dwyer Instruments, Inc.
Rmax =
Vps-10.0-Vrec
20 mA
0 to 10 V Output Models: Verify appropriate supply voltage. The 0 to 10 V output
models require a DC supply of 15 to 35 V or an AC supply of 15 to 29 V for proper
operation maximum. Maximum output load is 5 mA.
Printed in U.S.A. 10/13
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
FR# 06-443847-00 Rev. 5
www.dwyer-inst.com
e-mail: info@dwyer-inst.com
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