Emerson OCX8800 Quick Start Guide
Quick Start Guide
00825-0100-4880, Rev AD
February 2020
Rosemount™ OCX8800 Oxygen and
Combustibles Transmitter
with 4–20 mA HART® Protocol
Quick Start Guide February 2020
Essential instructions
Emerson designs, manufactures, and tests its products to meet many national and international
standards. Because these instruments are sophisticated technical products, you must properly install,
use, and maintain them to ensure they continue to operate within their normal specifications. You
must adhere to the following instructions and integrate them into your safety program when
installing, using, and maintaining Emerson's Rosemount products.
• Read all instructions prior to installing, operating, and servicing the product.
• Install equipment as specified in the installation instructions of the appropriate Reference Manual
and per applicable local and national codes. Connect all products to the proper electrical and
pressure sources.
Symbols
Earth (ground) terminal
Protective conductor terminal
Risk of electrical shock
Refer to reference manual.
Contents
Description and specifications......................................................................................................3
Installation................................................................................................................................... 4
Configuration and startup.......................................................................................................... 27
Using the local operator interface (LOI)...................................................................................... 35
Calibration................................................................................................................................. 38
Product certifications................................................................................................................. 46
Declaration of Conformity..........................................................................................................51
China RoHS table........................................................................................................................54
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1 Description and specifications
1.1 Component checklist
Check the model number of your Rosemount OCX8800 against the
transmitter features and options, making sure options specified by this
number are on or included with the unit. Use this complete model number
for any correspondence with Emerson.
Optional accessories provides a list of accessories for use with the
Rosemount OCX8800.
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2 Installation
2.1 Product safety
WARNING
EXPLOSIONS
The Rosemount OCX8800 may explode if used in hazardous areas.
The Rosemount OCX88A can be installed in general purpose areas only.
Do not install the Rosemount OCX88A in hazardous areas.
To maintain explosion-proof protection of the Rosemount OCX88C in
hazardous areas, all cable entry devices and blanking elements for
unused apertures must be certified flameproof, suitable for the
conditions of use, and properly installed.
To maintain explosion-proof protection of the Rosemount OCX88C in
hazardous areas, the sensor housing must not be mounted to any
surface or flange that exceeds 383 °F (195 °C).
To maintain explosion-proof protection of the Rosemount OCX88C in
hazardous areas, the sample entering the sensor housing must not
exceed 383 °F (195 °C).
WARNING
PHYSICAL ACCESS
Unauthorized personnel may potentially cause significant damage to and/or
misconfiguration of end users’ equipment. This could be intentional or
unintentional and needs to be protected against.
2.2 Mechanical installation
2.2.1 Select a location
The location of the transmitter in the stack or flue is important for maximum
accuracy in the oxygen analyzing process. You must position the probe so
the gas it measures is representative of the process.
For best results, position the transmitter near the center of the duct (40 to
60 percent insertion). Longer ducts may require several transmitters since
the oxygen and combustibles can vary due to stratification. A point too near
the wall of the duct or the inside radius of a bend may not provide a
representative sample because of the very low flow conditions. Select the
sensing point so the process gas temperature falls within the range of probe
material used. #unique_11/unique_11_Connect_42_fig_rds_cc3_5jb
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through #unique_11/unique_11_Connect_42_fig_a2b_pl3_5jb provide
mechanical installation references.
CAUTION
Damage to the electronics may result.
Do not allow the temperature of the electronics housing to exceed 185 °F
(85 °C).
CAUTION
Failure to connect the pneumatic lines can allow the flow of contaminants
into the transmitter's ports.
Whenever a positive stack pressure exists at the installation site, be sure to
connect all pneumatic lines prior to installing the transmitter in the stack or
ductwork.
Procedure
1. Check the flue or stack for holes and air leakage.
The presence of this condition will substantially affect the accuracy of
the oxygen and combustibles readings. Make the necessary repairs
or install the transmitter upstream of any leakage.
2. Ensure the area is clear of internal and external obstructions that will
interfere with installation and maintenance access to the transmitter.
Allow adequate clearance for the removal of the transmitter.
2.2.2 Install
Procedure
1. Ensure all components are available to install the transmitter.
You may install the transmitter intact as it is received.
2. Weld or bolt adapter plate onto the duct.
3. Use the pipe or wall mounting hardware as shown in #unique_11/
unique_11_Connect_42_fig_tlq_kf3_5jb to mount a remote
electronics housing.
Choose a location that does not exceed the length of the electronics
cable ordered.
4. Ensure the conduits drop vertically from the transmitter and the
conduit is routed below the level of the conduit ports on the housing
to form a drip loop.
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Drip loops minimize the possibility that moisture will damage the
electronics.
5. Where a positive stack pressure exists at the installation site, connect
all pneumatic lines prior to installing the transmitter in the stack or
ductwork.
CAUTION
If process temperatures will exceed 392 °F (200 °C), use anti-seize
compound on stud threads to ease future removal of the transmitter.
6. Insert sample and exhaust tubes through the opening in the
mounting flange and bolt the unit to the flange.
CAUTION
Uninsulated stacks or ducts may cause ambient temperatures in the
electronics housing to exceed 185 °F (85 °C) and damage the
electronics.
If insulation is removed to access the duct for mounting the
transmitter, make sure to replace insulation afterward.
2.3 Electrical installation
All wiring must conform to local and national codes. #unique_13/
unique_13_Connect_42_fig_hxd_nn5_5fb shows factory wired solenoid
power connections.
WARNING
Failure to install covers and ground leads could result in serious injury or
death.
Install all protective equipment covers and safety ground leads after
installation.
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WARNING
To meet the Safety Requirements of IEC 61010 (EC requirement), and
ensure safe operation of this equipment, connection to the main electrical
power supply must be made through a circuit breaker (min 10 A) in close
proximity and marked for this equipment which will disconnect all currentcarrying conductors during a fault situation. This circuit breaker should also
include a mechanically operated isolating switch. If not, then another
external means of disconnecting the supply from the equipment should be
located close by. Circuit breakers or switches must comply with a recognized
standard such as IEC 947.
Note
To maintain proper earth grounding, ensure a positive connection exists
between the sensor housing, the electronics housing, and earth. The
connecting ground wire must be 14 AWG minimum. Refer to #unique_13/
unique_13_Connect_42_fig_hxd_nn5_5fb.
Note
Line voltage, signal, and relay wiring must be rated for at least 221 °F
(105 °C).
2.3.1 Electrical connections
Make electrical connections, power, and communications to the electronics
enclosure through two ¾ national pipe thread (NPT) ports in the enclosure,
using fittings and cables provided by the customer.
Cable installation must meet NEC, IEC, and/or other applicable national or
local codes for Class I, Zone 1, IIB +H2 T3/T6 permanently mounted
equipment.
2.3.2 Connect line voltage
The transmitter operates on 100 to 240 Vac line voltage at 50 to 60 Hz. The
power supply requires no setup.
Connect the line (L wire) to the L terminal and the neutral (N wire) to the N
terminal on the AC power input terminal block in the electronics housing.
Connect the ground (G wire) to the ground stud in the electronics housing as
shown in #unique_13/unique_13_Connect_42_fig_hxd_nn5_5fb.
2.3.3 Connect output signals
The transmitter comes with two 4-20 mA signals with HART® on the oxygen
O2 signal.
Connect the output terminals in the electronics housing as shown in
#unique_13/unique_13_Connect_42_fig_hxd_nn5_5fb.
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Use individual shielded twisted wire pairs. Terminate the shield at the
electronics housing.
2.3.4 Oxygen (O2) 4-20 mA signal
One 4-20 mA signal represents the O2 value.
The O2 signal is at the AOUT 1 terminals.
2.3.5 Combustibles equivalent (COe) 4-20 mA signal
Another 4-20 mA signal at the AOUT 2 terminals represents the COe value.
2.3.6 Alarm output relay
Connect any customer-supplied relay input to the alarm output relay
terminal. Use shielded wire and terminate the shield at the electronics
housing. The alarm output relay terminal is a set of dry, number 2, form C
contacts with 30 mA, 30 Vdc capacity.
2.3.7 Remote electronics connections to sensor housing
Make the following connections between the remote electronics and sensor
housings with the electronics cable ordered with the package (Figure 1).
Braided cable is available in lengths up to 150 ft. (46 m).
Note
Interconnect wiring shown is for Rosemount supplied cables. For customer
furnished interconnect wiring or cables, refer to Figure 1.
2.3.8 Signal connections
Connect the electronics housing terminals to the corresponding terminals in
the sensor housing. The twisted wire pairs are numbered on the inner plastic
wrapper.
Keep twisted pairs together and match the numbers and wire colors shown
in Figure 1.
2.3.9 Heater power connections
Use the blue, white, orange, black, red, and yellow stranded wires in the
heater power cable to connect power to the three heaters in the sensor
housing.
Match the wire colors to the corresponding heater power terminal blocks in
the sensor and electronics housings as shown in Figure 1.
2.4
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Pneumatic installation
Pneumatic system connections depend on whether reference air set,
calibration solenoids, and/or blowback equipment options are equipped on
February 2020 Quick Start Guide
your transmitter. Refer to the following sections and select the option that
applies to your transmitter configuration.
2.4.1 Reference air set option (only)
When no options or only the reference air set option is equipped, use the
following procedure to install the pneumatic system components.
Procedure
1. Refer to Figure 2-1. Connect the reference air set (regulator/filter and
pressure gage) to the instrument air inlet on the electronics housing
and to the inlet side of the dilution air flow meter.
2. Connect the dilution air flow meter output to the dilution air inlet
fitting on the sensor housing.
3. Install an air line between the instrument air outlet fitting on the
electronics housing and the tee fitting on the sensor housing.
CAUTION
Failure to use proper gases will result in erroneous readings.
Do not use 100 percent nitrogen as an O2 low gas.
Emerson suggests using O2 low gas between 0.4 percent and 2.0
percent O2.
Do not use gases with hydrocarbon concentrations of more than
40 parts per million.
4. Use one CO gas and two O2 gases to calibrate the transmitter.
• CO: 1000 ppm or up to 4 percent, balance air
• O2 low gas: 0.4 percent , balance N
• O2 high gas: 8 percent, balance N
2
2
5. Connect the output of the test gas sources to the inlet port of the
CAL GAS flow meter. Install an air line between the flow meter outlet
port and the CAL GAS inlet fitting on the sensor housing.
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Figure 2-1: Pneumatic Installation, Rosemount OCX8800 with Reference
Air Set without Autocalibration
A. Sensor housing
B. Eductor air in
C. Electronics housing
D. Calibration gas in
E. Reference air in
F. Dilution air in
G. Dilution air flow meter 0.1 scfh
H. Instrument air out
I. Calibration gas flow meter (7 scfh, 20 to 30 psig [137.9 kPa to 206.8 kPa]
recommended)
J. Two-stage regulators
K. Instrument air supply
L. Pressure regulator/filter
General purpose: 35 psig (241.3 kPa)
Hazardous area: 45 psig (310.3 kPa)
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M. 2-in. (50.8 mm) pressure gauge, 0 to 60 psig (0 to 413.7 kPa)
N. Combination filter-regulator, 0 to 60 psig (0 to 413.7 kPa)
O. Flow meter, 1-10 scfh
P. Flow meter, 0.05-0.5 scfh
2.4.2 Reference air set and solenoids option without COe zero function
When the reference air set and test gas solenoids are included with your
transmitter, use the following procedure to install the pneumatic system
components.
Procedure
1. Install the reference air set according to the instructions in Reference
air set option (only), steps Step 1 through Step 3.
2. Refer to Figure 2-2. Connect the O2 low gas source to the CAL GAS
LO O2 inlet fitting on the electronics housing. Install a shutoff valve
and pressure regulator with gage in the O2 low supply line, as shown.
3. Connect the O2 high gas source to the CAL GAS HI O2 inlet fitting.
Install a shutoff valve and pressure regulator with gage in the O2 high
supply line.
4. Connect the CO high gas to the CAL GAS HI COe inlet fitting. Install a
shutoff valve and pressure regulator with gage in the CO high supply
line.
5. Connect the CAL GAS outlet fitting of the electronics housing to the
inlet port of the CAL GAS flow meter. Install an air line between the
flow meter outlet port and the CAL GAS inlet fitting on the sensor
housing.
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Figure 2-2: Pneumatic Installation, Rosemount OCX8800 with Reference
Air Set, Solenoids, and Autocalibration, without COe Zero Function
A. Sensor housing
B. Eductor air in
C. Electronics housing
D. Calibration gas in
E. Reference air in
F. Dilution air in
G. Dilution air flow meter 0.1 scfh
H. Instrument air out
I. Calibration gas flow meter (7 scfh, 20-30 psig recommended)
J. Two-stage regulators
K. Instrument air supply
L. Pressure regulator/filter 35 psig - general purpose, 45 psig - hazardous
area
M. Two-in. pressure gauge 0-60 psig
N. Combination filter-reg. 0-60 psig
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O. Flow meter 1-10 scfh
P. Flow meter 0.05-0.5 scfh
Q. Calibration gas out
2.4.3 Reference air set and solenoids option with COe zero function
Figure 2-3 shows the piping arrangement for the transmitter with
autocalibration when the COe Zero Function is used. The arrangement is
similar to Figure 2-2 except instrument air is used as the Hi O2 test gas. Refer
to Configuration and start-up for details of this function.
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Figure 2-3: Pneumatic Installation, Rosemount OCX8800 with Reference
Air Set, Solenoids, and Autocalibration, with COe Zero Function
A. Sensor housing
B. Eductor air in
C. Electronics housing
D. Calibration gas in
E. Reference air in
F. Dilution air in
G. Dilution air flow meter 0.1 scfh
H. Instrument air out
I. Calibration gas flow meter (7 scfh, 20-30 psig recommended)
J. Two-stage regulators
K. Instrument air supply
L. Pressure regulator/filter 35 psig - general purpose, 45 psig - hazardous
area
M. 2-in. (50.8 mm) pressure gauge, 0-60 psig
N. Combination filter-regulator, 0-60 psig
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O. Flow meter, 1-10 scfh
P. Flow meter, 0.05-0.5 scfh
Q. Calibration gas out
Note
If instrument is to be used as the high O2 calibration gas, the low O2 and COe
calibration gases must also be set to the same pressure (e.g., 35 psig).
2.4.4 Reference air set, solenoids, and blowback option with COe zero function
Figure 2-4 shows the piping arrangement for the transmitter with the
blowback and autocalibration options when COe zero function is used. The
arrangement is similar to Figure 2-2 except instrument air is used as the Hi
O2 test gas. Refer to Configuration and start-up for details of this function.
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Figure 2-4: Pneumatic Installation, Rosemount OCX with Reference Air
Set, Solenoids, Blowback and Autocalibration, with COe Zero Function
A. Sensor housing
B. Eductor air in
C. Electronics housing
D. Reference air in
E. Dilution air in
F. Dilution air flow meter, 0.1 scfh
G. Instrument air
H. Calibration gas flow meter (7 scfh, 20-30 psig recommended)
I. Two-stage regulators
J. Instrument air supply
K. Pressure regulator/filter, 35 psig - general purpose
L. Calibration gas out
M. Check valve
N. Actuating air
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O. Normally open solenoid valve
P. Normally closed solenoid valve
(1)
(1)
Q. Blowback valve, air operated
R. 2-in. (50.8 mm) pressure gauge, 0-60 psig
S. Combination filter/regulator, 0-60 psig
T. Flow metet, 1-10 scfh
U. Flow meter, 0.05-0.5 scfh
V. Pneumatic actuator
W. Combination filter/regulator, 0.60 psig
X. Check valve, 5 psig
Note
Wall mount the air-operated blowback valve on a suitable mounting plate.
Note
Actuating air pressure at blowback valve inlet port must be at least 51 psig
to fully actuate the valve.
Note
If instrument is to be used as the high O2 calibration gas, the low O2 and COe
calibration gases must also be set to the same pressure (e.g., 35 psig).
2.4.5 Reference air set, solenoids, and blowback option without COe zero function
Installing a transmitter with the blowback option requires the addition of air
operated blowback valve, regulator and gage, and check valve. Figure 2-5
shows the piping arrangement for the transmitter with the blowback and
autocalibration options. Figure 2-4 shows the piping arrangement for the
transmitter with the blowback option, but without autocalibration (without
test gas solenoids). When the reference air set, calibration gas solenoids,
and blowback options are included with your transmitter, use the following
procedure to install the pneumatic system components.
Procedure
1. Connect the calibration gas sources according to the instructions
Reference air set and solenoids option without COe zero function,
steps Step 2 through Step 5.
2. Connect a clean, dry, instrument-quality supply of air (20.95 percent
O2) to the 45 psig and 55 psig pressure regulators.
The inlet to the 45 psig regulator accepts a ⅛-in. NPT fitting. The
inlet to the 55 psig regulator accepts a ¼-in. NPT fitting.
(1) During blowback operation, states of both solenoid valves change.
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