AirSense Kele OS-2 Series User manual

O S - 2 O p e r a t i o n P r o c e d u r e
OS-2 Wiring and Calibration Instructions
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Installation
The OS-2 is suitable for indoor use only. Mount the unit as close to the source of potential refrigerant
leaks as possible. Some recommended considerations are as follows:
1. Mount the unit with the sensor pointing down.
2. Mount the unit in a location with low vibration. Strong vibration may cause a change in the condi-
tion of the internal membrane.
3. The sensor should be mounted 3’to 5’ (0.9 to 1.5m) from the floor in equipment rooms or 1’ (0.3m)
above the floor in refrigeration pits.
4. The OS-2 should cover about 1000-1500 square feet with adequate air movement.
5. Mount at least 5’ (1.5m) from the exhaust fan.
6. Verify operation yearly.
Note: Make all connections in accordance with national and local codes. Not recommended for MRI
rooms.
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Green = normal levels
Red = alarm levels
STATUS:
SERVICE
NEEDED
OS-2S
Operation
The OS-2 has no power switch and is operational whenever it has sufficient operating power.
Operational status is indicated by a pair of LEDs on the front cover as shown in the table below:
ALARM
NC ICOM INO
OUT1- OUT1+ PWR- PWR+
Power Connection:
Use the Wiring Diagram (Figure 5) for reference with the following descriptions.
The OS-2 can be powered from 20 to 30 volts AC or DC. The operating power is connected to the four-position termi-
nal connector at the positions marked PWR+ and PWR- on the circuit board. The polarity of the power inputs are only
relevant when DC voltage is used to power the unit; if DC voltage is hook up in reverse polarity the unit will not power
up, but no damage to the controller will occur. Because the OS-2 uses a non-isolated power supply, a separate power
transformer for each unit is the safest configuration when the analog outputs are used.
Analog Output Connection:
The OS-2 has an analog output option: the analog output is accessed at the 4-position terminal block.
Connect to positions labeled OUT 1+ and OUT 1-.
The analog output can be configured as voltage or current (refer to Table 3 in the Configuring the Controller section for
more information). If the 4-20mA current output is selected, current will flow out of the terminal marked ‘+’ and return
through the terminal marked ‘-’.
This is not a loop powered device: do not attempt to power the OS-2 though the 4 – 20mA (analog output) connection as
this will void the warranty and likely damage the unit.
ALARM Relay Connections
The OS-2 has a SPDT, dry contact relay output
that is accessed at the three-position screw
terminal.
The top terminal is the relays NO contact,•
The middle terminal is COM (common).•
The bottom is the relays NC contact.•
Potential Effects of Oxygen-Deficient Atmospheres
O2 content
(%)
Effects and Symptoms (at atmospheric pressure)
20.9% Normal air
19.50% Minimum permissible oxygen level
15 – 19% Decreased ability to work strenuously. May induce early symptoms in person
with coronary, pulmonary, or circulatory problems
12 – 14% Respiration increase during exertion
10 – 12% Poor judgemnt, lips turn blue
8 – 10% Mental failure, fainting, unconsciousness
6 – 8%
4-5 minutes -recovery with treatment
6 minutes – 50% fatal
8 minutes – 100% fatal
4 – 6% Coma onset in 40 seconds
source: excavationsafetynews.com

OS-2 Oxygen Sensor
Parameter Value Comments
Measurement Range 0 – 25.0%
Resolution 0.1%
Operating Condition
Atmospheric Pressure:
811hPa - 1216hPa
No condensation
Temperature:
5°C – 40°C
Relative Humidity:
10 – 90% RH
Accuracy ±1.5% Of full scale
Life Expectancy
AirSense OS-25: 5 years
Life expectancy is short-
ened with exposure to high
temperatures, low pressures,
extremely dry environments,
and high concentrations of O2.
AirSense OS-50: 10
years
Storage Temperature -20°C – +60°C
Storage at low temperature (in
a refrigerator) and low oxygen
concentration will prolong
the life expectancy of the O2
sensor. Sensor will freeze at
temperatures below -20°C and
will not function until thawed.
Exposure to temperatures
above 60°C will damage sensor.
Relay Outputs 1 SPDT dry contact Rated for 240 VAC, 1A
Alarm Threshold 1% – 24% Default: 19.5%
Analog Output See Table 3 Jumper Selectable
Voltage Output Minimum Load Imped-
ance (Rmin) Rmin = 100kΩ
Current Output Maximum Loop Imped-
ance (Rmax) Rmax = 500Ω
Power 20 – 30 V (AC/DC)
Power Consumption 0.3A rms
TM
Digital Control Systems
OS-2 Series O2 Monitor REV 1/12/11
Setting the Alarm Setpoint
Press and hold“up” botton on display1.
Display will read SP1 (defult set point is set at2.
19.5% O2)
Press up button to increase set point3.
Press down to decrease set point4.
Caution setting setpoint too low can cause5.
serious health problems or death.
“UP” “DOWN”
SETPOINT
Current Loop Connection
The 4 – 20 mA current loop output appears at the screw terminal connector labeled ‘OUT+’ and ‘OUT -’, located below
the power connector and the relay contector.
The OS-2 is NOT a loop powered device. Attempting to power the device through the current loop connector will void
the warranty and likely damage the unit.
The loop current flows out of the upper terminal marked ‘+’ and returns to the lower terminal marked‘-‘.
Because the OS-2 uses a non-isolated power supply, a separate power transformer for each unit is the safest configura-
tion when the current loop output is used. The current-loop outputs from multiple units powered from the same trans-
former must be connected to fully isolated inputs to avoid potentially destructive current loops.
O2-25
Oxygen Sensor
TM
Analog
Display Setting
The display is set to automaticly turn on durning intal
power up and off after 30 seconds.
To turn on the display permanetly
Press and hold both the“up” and “down” button un1.
the display read“SLP.1” and than releas buttons
Press “down” button to read “SLP.0”2.
The display is now permently on3.
To turn the display permently off set the readout t4.
“SLP.1”