PBI Dansensor SGI-3 - Maintenance and Calibration Procedures; SGI-3 Calibration Guide

6. Maintenance
Although the PBI-Dansensor A/S Oxygen Indicator is very reliable and stable‚ there may
be situations when the information displayed is not correct for some reason.
Later in this manual you will find a trouble-shooting chart with typical fault diagnoses,
most frequent causes, and solutions to the fault in question.
6.1. Calibration procedure for SGI-3
Calibration
Warm up SGI-3 for at least 4 hours.
Normally, 6 calibrations must be carried out, 4 of which with gases, typically: 1000ppm
O
2
, 25ppm O
2
, 500ppm O
2
in 10% H
2
formier gas and 50ppm O
2
in 10% H
2
formier gas.
Supply the calibration gas via an overflow device with a flow rate of at least 0.5 l/min, and
wait until the readings are quite steady.
1. Activate the calibration menu by pressing the “RANGE” button and the two alarm
buttons ( ) for 3 seconds.
2. The calibration menu now allows you to select the required calibration by pressing the
“RANGE” button.
Cal. 1 : Offset calibration of the current output.
The “Alarm” LED flashes, and the first red LED is lit. Connect an ammeter to the DIN
connector, pin 1 (+) and pin 2 (-). Set the current output at 4mA by means of the “alarm
up” or the “alarm down” button. This setting is independent from the gas input. Save
the calibration by pressing both “alarm up” and “alarm down” at the same time.
Cal. 2 : Gain calibration of the current output.
The “Alarm” LED is constantly lit, and all 48 red LEDs are lit. Connect an ammeter to
the DIN connector, pin 1 (+) and pin 2 (-). Set the current output at 20mA by means of
the “alarm up” or the “alarm down” button. This setting is independent from the gas
input. Save the calibration by pressing both “alarm up” and “alarm down” at the same
time.
Cal. 3 : 1
st
calibration of inert gases.
The “
Inert” LED flashes. Select an oxygen concentration that corresponds to the
highest ppm value used, and let the system flush through until a steady readout is
achieved (at least 2 min.). Adjust the number of LEDs that should be lit using the
“alarm up” or the “alarm down” button. Save the calibration by pressing both “alarm
up” and “alarm down” at the same time.
Cal. 4 : 2
nd
calibration of inert gases.
The “
Inert” LED is lit. Select an oxygen concentration that corresponds to the lowest
ppm value used, and let the system flush through until a steady readout is achieved (at
least 2 min.). Adjust the number of LEDs that should be lit using the “alarm up” or the
“alarm down” button. Save the calibration by pressing both “alarm up” and “alarm
down” at the same time.
Cal. 5 : 1
st
calibration of formier gases.
The “
Formier 10%” LED flashes. Select a formier gas that corresponds to the highest
ppm value used, and let the system flush through until a steady readout is achieved (at
least 3 min.). Adjust the number of LEDs that should be lit using the “alarm up” or the
“alarm down” button. Save the calibration by pressing both “alarm up” and “alarm
down” at the same time.
PBI-Dansensor A/S SGI-3/OXI-3/OXI-3.1 User manual
12 PBI-210247-H UK 07/11/2005