Model 3010BR Hydrogen sulfide Analyzer
AMI
Analyzer Manual
4
The RS-232 connection.
The power supplies. The unit can be powered optionally either by AC or DC.
It can also contain the optional explosion-proof heater that controls the cell block temperature,
so that the unit can remain operational down to –20
F, while using minimal power.
All the output connections, such as the alarm relays, the output voltage or current (which are user-
selectable and also can be locally calibrated), and the computer interface are available in this enclosure.
The alarms are fully configurable through a special PC program that communicates to the analyzer. You can
select hold-off (delay-ON) times for each alarm, and configure whether the relays open or close, either
above or below the set point. The relays can be set so that they can control a motorized solenoid valve.
You can calibrate the voltage or current output to your monitoring device. The unit stores up to three
months of readings, and this file can be downloaded into a PC. All of these features are described below in
detail.
The sensor:
The analyzer is received with the sensor installed and ready to operate, already calibrated. Unlike trace
oxygen sensors, the sensor is not affected by being exposed to air. So you don’t need to worry about back
diffusion of air into this analyzer, and you also don’t need to worry about leaks allowing hydrogen sulfide
from the air compromising the reading. Instead, hydrogen sulfide presents its own set of issues. These are
mainly due to the fact that hydrogen sulfide sticks to surfaces, and so the walls of the sample tubing act as a
sort of filter – they have to be filled up with hydrogen sulfide before the gas that comes out has the same
amount of hydrogen sulfide in it as it did when it entered the tubing. If you use plastic tubing or
components this problem will get worse. It is possible to get special tubing (“Sulfinert”) that has been
treated to avoid this problem, but in practice simply allowing the gas to flow for long enough usually is
adequate.
Sensor Warranty:
The sensor has an expected life of three years, and it is warranted to operate for a period of one year on a
pro-rated basis. If the sensor ceases to operate correctly before this time has elapsed, contact AMI for a
return authorization for evaluation.
Instrument Warranty:
Any failure of material or workmanship will be repaired free of charge for a period of two years from the
original purchase (shipping date) of the instrument. AMI will also pay for one way ground shipment (back to
the user).
This warranty does not cover the sensor, which is covered by its own warranty (see above).
Any indication of abuse or tampering will void the warranty.
Hydrogen sulfide toxicity:
From Wikipedia, under hydrogen sulfide, as of 7/1/2009:
0.0047 ppm is the recognition threshold, the concentration at which 50% of humans can detect the
characteristic odor of hydrogen sulfide
, normally described as resembling "a rotten egg".
Less than 10 ppm has an exposure limit of 8 hours per day.
10-20 ppm is the borderline concentration for eye irritation.