Gas Detection GDA 3160 User manual

GDA 3160
3100 V5.5 HARDWARE AND ABOVE
Refrigerant Gas Detector
Operating Manual
© Copyright Gas Detection (Australia) Pty Ltd Dec 2017

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Precautions:
To avoid instrument damage and potential dangerous accident; do not use this product before reading
the manual.
Introduction:
This sensor/controller detects generally used refrigerant gases within Australia (R22, R123, R134a, R404,
R407, R410 etc) within the range 0-1000ppm via diffusion. Each sensor is factory calibrated to a specific
gas type and output type and range. It has an analog output which can be one of the following, 4-20mA;
0-20mA; 0-5V; 0-10V. There is also a volt free relay which can be user programmed to operate anywhere
within the sensor range. The unit is powered and calibrated to 24VDC.
Specifications:
Power Requirements: 24V~32V DC (24V recommended)
Wiring Requirements: 3 core with overall screen with current carrying capability to suit the length
of cable run, Screen must be connected to the Earth connection on the
connector P1.
Power Consumption: <300mW (average)
Output Types: 4-20mA(Standard), 0-20mA, 0-5v, 0-10v (User Specified)
Target Gas: Refrigerant (R22, R123, R134a, R404a, R407c, R410a, etc) user specified
Target Gas Range: 0-1000ppm
Gas supply: By diffusion (atmospheric pressure)
Alarm Relay: Adjustable alarm level with on board buzzer, 5 second alarm validation period
Fault/ Alarm Warning: Fault; Red LED, Alarm; Red LED and on board buzzer
Operating Temperature: 0 to 40 °C
Operating Air Pressure: 800 to 1200 hPa
Operating Humidity: 0 % to 95 % rel. humidity (not condensing)
Accuracy of Reading: 1% FS(1)
Sensor Start Up Time: <2 minutes
Sensor Accurate After: <30 minutes
Response Time: Approx. 30secs
Zero Drift: ≤2% FS(1) p.a
Span Drift: ≤2% FS(1) p.a
Enclosure Size: Clipsal single gang switch plate (116 x 76mm)
In wall dimensions 73 x 53 x 48 (L, W, D)
Note:
1. FS = Full Scale
The sensor requires a peak current of 400mA at 24V DC with a repetition rate of 250msecs, please ensure
the external power supply can meet this demand.

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Installation:
The sensor is suitable for indoor use only. If it is going to be used in external environments seek specialist
advice from GDA.
Mount the sensor as close as possible to where the leak of the refrigerant gas being detecting may occur
as the distance from a potential leek effects the time taken to detect it. The further from the potential
leeks the more the gas will be diluted.
Take into account drafts and air movements when mounting the sensor.
IT IS VERY IMPORTANT THAT THE GDA 3160 IS INSTALLED IN THE MOST UPRIGHT POSITION AGAINST
VERTICAL STRUCTURE
DO NOT EXPOSE THE SENSOR FACE TO DIRECT WATER DROPLETS OR CONDENSING ATMOSPHERES
These sensors use critically aligned optical benches and should not be
subjected to vibration or mechanical shock. Handle with care.
GDA 3160 SENSOR INSTALLATION POSITION
___________________________________________________________________________________
YES
NO
NO

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Electrical installation:
The sensor electrical connection is on the rear of the faceplate via a 4 pin polarised plug on the PCB. A 3
core cable with an overall screen with current carrying capability to suit the length of cable run, Screen
must be connected to the Earth connection on the connector P1.
The Protection Cover Plate is used to protect the main PCB from most cases of static shock during
installation, please keep this plate on at all time during installation process.
Protection
Cover Plate
4-20mA or Voltage O/P
GND
Normally Closed
Common
+24V DC
EARTH
Normally Open
Alarm Mute
Button
Fault/
Alarm
LED
Alarm
Enable
Jumper

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Operation:
When power is applied the sensor goes through a power up procedure as detailed below. Please note
that the current or voltage o/p is not valid for approximately 30sec - 2 minutes from the power being
applied. During the 2 minute power up the current/voltage output of the GDA 3160 may reach the full
scale of the set output. Ensure that this does not affect external equipment.
LED
STATE
FUNTION
ON
Power is present
OFF
Power is not present
LEDs CHASE
Sensor is in its initialisation period (approx 30 secs but in
some sensors this can be 1-2 seconds) during this period
the 4-20ma o/p is 1.2ma
YELLOW ON , BLUE
FLASHING
The sensor is in its warm up period (approx 30 sec to 2
mins) during this period the sensor o/p is 1.2ma
FLASHING
Normal operation the sensor has stabilised and the 4-
20ma reflects the amount of gas present
ON
This indicates a fault associated with the sensor. The o/p
current is reduced to 1.2ma
LED Indicators Location:
Colours:

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Output Operation:
Current or Voltage 0-20mA, 4-20mA, 0-5V, 0-10V Configuration:
This output will generate a current or voltage output reflecting the full scale of the sensor. This output is
factory set and calibrated to the user’s specified requirements at point of purchase.
If an output type was not specified by the user at time of purchase the default setup is set and calibrated
to 4-20mA. This is user adjustable out in field but will not be as accurate to what it was originally
calibrated to from factory.
The 4-20ma will drive into a maximum of 680Ω load impedance (line and input impedance) at 24V.
Be cautious when handling the GDA 3160 as there are delicate components that can easily be damaged
by static discharge. Always observe anti static precautions.
To change the output option:
1. Isolate the GDA 3160 by removing the incoming power source connector (P1) from the rear of the
board
2. Adjust jumper pins to the desired output configuration (see Table below)
3. Ensure output is configured for the changed output option
4. Revert to normal operation
Output Type
P2 Jumper Configuration
P2 Jumper location
1
Sen
Pwr
2
MCU
Pwr
3
HS/FS
4
0/4-
20mA
5
V Out
6
Reset
4-20 mA (Default)
IN
IN
IN
IN
OUT
OUT
0-20 mA
IN
IN
IN
OUT
OUT
OUT
0-5 V
IN
IN
OUT
OUT
IN
OUT
0-10 V
IN
IN
IN
OUT
IN
OUT
P2
P4
P2 Jumper
Description
P1
1 2 3 4 5 6

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Relay Switching O/P on Alarm Configuration:
This output will operate a relay that actives when the set alarm point is triggered by an increased gas
concentration. From factory the default set alarm point is 100ppm or set to the value requested by the
user at purchase. The alarm point is user adjustable.
Be cautious when handling the GDA 3160 as there are delicate components that can easily be damaged
by static discharge. Always observe anti static precautions.
Ensure that the alarm enable jumper (Orange) is on JP6.
(The alarm enable jumper has been factory set to on for ver 5.5.)
If the "MUTE" link (Purple) is in it will mute the on board buzzer. If the optional mute button is installed
the on board buzzer can be muted by pressing the button which is located on the front panel (see
location of the mute button in the picture on page 4).
To set the relay activation alarm point:
1. Remove the GDA 3160 from the wall to access the back of the sensor unit;
2. Place a volt meter between test points 1 & 2 (RED);
3. Adjust “RAlarm”POT (BLUE) with a small screw driver, to the calculated voltage corresponding to the
desired alarm point (see formula information below); and
4. Revert to normal operation.
P1
Test point 1 &2 (RED)
RAlarm
POT
(BLUE)
Normally Closed Normally Open
MUTE
LINK
(Purple)
Common
Alarm Enable
(Orange)

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Refrigerant Gas Relay Alarm Point Formula:
Vin = Alarm point Concentration / 204.8
Example;
Alarm level set point required at 250ppm
250/204.8= 1.22 V
1. The alarm switch point is preset with 10% hysteresis to prevent relay “chatter”;
2. The relay is non-latching and will turn off when the gas level falls to below 10% of the alarm point; and
3. The alarm relay contacts are rated 50 VDC 0.5 A non inductive. If heavier loads require switching a slave
relay must be used.
Calibration:
The GDA 3160 are factory calibrated to 0-1000ppm of the users required target gas and are sent out with
a certificate of calibration stating target gas information.
Functional testing may be carried out with a suitable test gas to ensure that the 4-20ma o/p corresponds
with the gas level. This should be undertaken when the unit is fully assembled and using a flow rate of
~0.5L/min of the target gas. Test gas and equipment are available from Gas Detection Australia.
When in service, if the sensor falls below a minimum working standard the o/p current will fall to
<3.00mA which will be detected at the control unit has a sensor fault.
Zero point Calibration:
A manual zeroing of the sensor can be performed when the sensor has been powered for a minimum of
one hour. The zero can be performed when the sensor is in a known fresh air, Non refrigerant gas
environment or gassed with Nitrogen. The sensor must be in one of the three above conditions for a
minimum of five minutes or until the output has reached a stable point.
To perform a manual zero:
1. Remove the GDA 3160 from the wall to access the back of the sensor unit;
2. Add a jumper to pins 1 and 3 of P4 see picture below, This enters Manual Calibration Mode (see table
for LED sequence);
3. Press and hold the ZERO calibration button SW1for one second (see table for LED sequence):
If the zero was successful a short beep will be heard (see table for LED sequence)
If the zero was not successful a two sec beep will be heard (see table for LED
sequence). Repeat step 3 after ensuring that the sensor is in fresh air and stable.
4. When successfully zeroed remove the Manual Calibration jumper from header P4 and return to normal
operation.

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Mode
LED Light Sequence
Manual CAL Mode
0.5 sec
Alternate Blinking at once per
second
Performing Zero
0.5 sec
Alternate Blinking at once per
second for ~ 4 sec
Zero Successful
0.1 sec
Fast Blink for ~ 2 sec
Zero Failed
Solid for > 2 sec
Manual Calibration
Mode: Add a jumper
to pins 1 and 3 of P3
P4
LED Colours:
ZERO Calibration
button SW1
Use supplied jumper
on pins 18 and 17 of
P3 for Manual
Calibration Mode,
return to this location
only.
1 3
116 mm
76 mm
62 mm
48 mm

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Thank You For Supporting
Australian Manufactured
Products

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Notes

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