Omega FOB100, Руководство пользователя

Страница: 9 / 30

9
Warning: The fiber type that is used with your thermometer is of a special type, and it is
recommended that you get ALL of your patch cords (also called extension cables) from Omega.
9) Analog output connector(s): There are a total of 1, 2 or 4 such connectors, one for each channel. Prior
to shipment, your FOB100 thermometer was factory set to one of the following configurations: 4-20mA or
0-10V output. The minimum analog output value corresponds to minus 100°C and the maximum analog
output value corresponds to 300°C. The thermometer normal range is from minus 80°C to 250°C, so a
minimum value indicates an under-range error; likewise, a maximum value indicates an over-range error
condition. If there is a sensor problem for a given channel, the analog output may take one of the following 3
states (refer to the RS-232 “o” command, Section 5.3):
a) It will toggle between the minimum and maximum values, at approximately 0.5 Hz, this indicates a
sensor problem for that channel (o0). This is the default setting; to change it, you will need to use the
RS-232 “o1” or “o2” command.
b) The analog output is forced to its maximum value (o1); this would indicate a “too-hot” situation.
c) The analog output is forced to its minimum value (o2); this would indicate a “too-cold” situation.
Warning: Do not connect any external voltages to these outputs; this may cause permanent
damage to the thermometer unit.
Note: If the unit is in “sleep” mode, the analog outputs will keep their values until the FOB100 acquires new
temperature values.
10) 18 Volts DC power connector: You can use a DC power supply from 14V to 28V; note that at 15V or
less, you will be unable to use more than one (1) 500
Ω
load at the analog output, for all current output
configurations. There is an internal fuse, to protect the system in case of electrical problems; this fuse is not
user changeable.