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5 OPERATION AND CALIBRATION
This section describes how the functionalities of the AMC-VersaTox are operated and
performed. There are three sections that follow.
5.1 OPERATION
The operation of this product is quite straight forward and user friendly. The operation is divided
into three main sections discussed below.
5.1.1 TRANSMITTER
The AMC-VersaTox sensor/transmitter is factory calibrated for the gas listed in the Product
Information (Section 2) at the beginning of this manual. The sensor/transmitter should not
require re-calibration when first installed and powered up, but a test for correct operation is
recommended after a stabilization period of 30 minutes.
In clean air, after the stabilization period, the transmitter should be sending a signal of
approximately 4 mA to the monitor or controller (except oxygen). Although the electrochemical
sensors are very selective, there are some interference gases, which can cause a response
from the sensor. In the case of large signal variations (in a clean air environment), check for an
installation problem or the possibility of an interference gas being present.
5.1.2 RELAY, POWER BOARD (OPTIONAL)
In the DC 3 or 4 wire or the AC power interfaces, the relay, power board is required and it also
contains the optional relay. The power LED indicates that the board is powered on. The wiring
for all the variances are described in sections 4.2.1.3 to 4.2.1.9 and the wiring for the relay is
found in section 4.2.2. The relay has a user selectable alarm trip point; see section 5.3 for setup
instructions. Once the detected gas concentration goes over the selected alarm trip point, the
relay is energized and the alarm LED is illuminated. The relay will only go out of alarm when the
gas concentration is below the trip point. The alarm trip point average window size is ±2.5% of
the selected trip point. This is done so the relay is not switching on and off when the gas
concentration is around the trip point. The version of the AMC-VersaTox with the 120VAC plug
in power supply is equipped with a factory installed relay controlled buzzer.
5.1.3 DISPLAY BOARD (OPTIONAL)
The AMC-VersaTox is available with an optional display. The display depicts the gas
concentration with a 2 second delay in the assigned engineering units.
At power up, the display runs through the following sequence:
•
Indicates the software version
•
Performs a segment test by counting from 0 to F for each of the three digits
•
Displays the configured range
•
Displays the detected level
Again, it is recommended to have a 30 minute stabilization period before a test for correct
operation is performed.
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