I
NTRODUCTION
245364-U Rosemount Analytical April 2000
1-3
Model 755A Oxygen Analyzer
1.4 RECORDER VOLTAGE AND CURRENT OUTPUTS
V
OLTAGE
O
UTPUTS
(S
TANDARD
)
Provided a standard is a jumper selectable voltage output of 0 to 10 mV, 0 to 100 mV,
0 to 1 V, or 0 to 5 V DC.
I
SOLATED
C
URRENT
O
UTPUT
(O
PTION
)
An isolated current output is obtainable with the optional Current Output Board, either
included with the Model 755A or added at a later date in the field.
This option provides a current output of either 0 to 20mA or 4 to 20mA for a maximum
of 850 ohms.
Refer to Section 8, Replacement Parts, for the part number of the Isolated Current
Output option.
Note
Voltage and current outputs may be used simultaneously, if desired.
1.5 AUTOMATIC PRESSURE COMPENSATION
The oxygen readout is automatically corrected for pressure variations within 3% of the
target value, which may be set anywhere within the range of -2.7 to 3.3 psig
±
3 psig (-
18.6 to 22.8 kPa
±
21 kPa).
1.6 ALARM (OPTION)
The analyzer has an alarm relay assembly consisting of two single-pole, double-throw
relays, one each for the ALARM 1 and ALARM 2 contacts. These relays may be used
to drive external, customer-supplied alarm and/or control devices.
1.7 CASE MOUNTING OPTIONS
The analyzer is supplied, as ordered, with hardware for one of three mounting
arrangements: Panel, wall, or pipe stanchion.
1.8 ELECTRICAL POWER OPTIONS
The analyzer is supplied, as ordered, for operation on either 120 VAC, 50/60 Hz, or
240 VAC, 50/60 Hz.
