Model 1181SO
Dissolved Oxygen Two-Wire Transmitter
Instruction Manual
PN 51-1181SO/rev.A
April 2003
ESSENTIAL INSTRUCTIONS
READ THIS PAGE BEFORE PRO-
CEEDING!
Rosemount Analytical 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. The following instructions must be adhered
to and integrated into your safety program when installing,
using, and maintaining Rosemount Analytical products.
Failure to follow the proper instructions may cause any one
of the following situations to occur: Loss of life; personal
injury; property damage; damage to this instrument; and
warranty invalidation.
• Read all instructions prior to installing, operating, and
servicing the product. If this Instruction Manual is not the
correct manual, telephone 1-800-654-7768 and the
requested manual will be provided. Save this Instruction
Manual for future reference.
• If you do not understand any of the instructions, contact
your Rosemount representative for clarification.
• Follow all warnings, cautions, and instructions marked
on and supplied with the product.
• Inform and educate your personnel in the proper installation, operation, and maintenance of the product.
• Install your equipment as specified in the Installation
Instructions of the appropriate Instruction Manual and
per applicable local and national codes. Connect all
products to the proper electrical and pressure sources.
• To ensure proper performance, use qualified personnel
to install, operate, update, program, and maintain the
product.
• When replacement parts are required, ensure that qualified people use replacement parts specified by
Rosemount. Unauthorized parts and procedures can
affect the product’s performance and place the safe
operation of your process at risk. Look alike substitutions may result in fire, electrical hazards, or improper
operation.
• Ensure that all equipment doors are closed and protective covers are in place, except when maintenance is
being performed by qualified persons, to prevent electrical shock and personal injury.
DANGER
HAZARDOUS AREA INSTALLATION
INTRINSICALLY SAFE INSTALLATION
Installations in hazardous area locations
must be carefully evaluated by qualified
on site safety personnel. Transmitter and
Sensor alone are not
Intrinsically safe. To
secure and maintain an intrinsically safe
installation, a certified safety barrier must
be used and the installation must comply
with the governing approval agency (FM,
CSA or BASEEFA/CENELEC) installation
drawing requirements (see Section 2.0 Installation).
EXPLOSION-PROOF INST
ALLATION
Caution: Sensors are not explosion-proof. If
the sensor must be installed in a hazardous
location an intrinsically safe system must be
implemented.
To maintain the explosion-proof rating of the
transmitter, the following conditions must be
met:
• Discontinue power supply before
removing enclosure covers.
• Transmitter covers must be properly
installed during power on operation.
• Explosion proof "Y" fittings must be
properly installed with sealing compound prior to applying power to the
transmitter.
• Serial tag cover over the external Zero and
Span adjustments must be in place.
• See Installation Section for details.
Proper installation, operation and servicing
of this instrument in a Hazardous Area
Installation is entirely the responsibility of
the user.
Emerson Process Management
Rosemount Analytical Inc.
2400 Barranca Parkway
Irvine, CA 92606 USA
Tel: (949) 757-8500
Fax: (949) 474-7250
http://www.RAuniloc.com
© Rosemount Analytical Inc. 2001
MODEL 1181SO TABLE OF CONTENTS
MODEL 1181SO
DISSOLVED OXYGEN TWO-WIRE TRANSMITTER
TABLE OF CONTENTS
Section Title Page
1.0 DESCRIPTION AND SPECIFICATIONS.............................................. 1
1.1 Features and Applications .................................................................... 1
1.2 Performance Specifications.................................................................. 2
1.3 Ordering Information............................................................................. 3
2.0 INSTALLATION..................................................................................... 4
2.1 Unpacking and Inspection .................................................................... 4
2.2 Mechanical Installation ......................................................................... 4
2.3 Sensor Installation ................................................................................ 4
2.4 Electrical Installation............................................................................. 4
2.5 Hazardous Locations-Explosion Proof Installation ............................... 6
2.6 Hazardous Locations-Intrinsically Safe Installation .............................. 6
3.0 CONFIGURATION, START-UP AND CALIBRATION........................... 16
3.1 General................................................................................................. 16
3.2 Configuration ........................................................................................ 16
3.3 Start up ................................................................................................. 16
3.4 Span Calibration ................................................................................... 18
4.0 OPERATION AND DESCRIPTION OF CONTROLS............................ 22
4.1 Theory of Operation.............................................................................. 22
4.2 Measurement Variables ........................................................................ 23
4.3 Description of Controls ......................................................................... 24
4.4 Converting to an LCD unit .................................................................... 26
5.0 DIAGNOSTICS AND MAINTENANCE ................................................. 27
5.1 General................................................................................................. 27
5.2 Disassembly Procedure........................................................................ 27
5.3 Reassembly Procedure ........................................................................ 27
5.4 Troubleshooting.................................................................................... 28
5.5 1181SO Operation Check..................................................................... 29
6.0 SPARE PARTS..................................................................................... 30
6.1 Spare Parts........................................................................................... 30
7.0 RETURN OF MATERIALS.................................................................... 34
7.1 General................................................................................................. 34
7.2 Warranty Repair.................................................................................... 34
7.3 Non Warranty Repair............................................................................ 34
i
MODEL 1181SO TABLE OF CONTENTS
TABLE OF CONTENTS CONT’D.
LIST OF FIGURES
Figure No. Title Page
2-1 Mounting and Dimensional Drawing..................................................... 5
2-2 Model 1181 SO Wiring Details ............................................................. 7
2-3 FM Explosion Proof Installation............................................................ 8
2-4 FM Intrinsically Safe Installation and Entity Parameters........................ 9
2-5 CSA Intrinsically Safe Installation......................................................... 12
2-6 CENELEC Intrinsically Safe Installation............................................... 13
3-1 Calibration Set Up ................................................................................ 17
3-2 Calibration with Agitated Fresh Water .................................................. 21
4-1 Oxygen Solubility in Fresh and Sea Water .......................................... 22
4-2 Location of Controls.............................................................................. 25
4-3 1181SO LCD Meter Option -06 ............................................................ 26
5-1 1181SO Operation Check Up ............................................................... 29
6-1 1181SO Parts Breakdown .................................................................... 31
6-2 1181 SO Transmitter PCB .................................................................... 32
6-3 1180 SO Transducer PCB .................................................................... 32
6-4 1180 SO Power Supply PCB................................................................ 33
6-5 1181 SO PCB Stack ............................................................................. 33
LIST OF TABLES
2-1 Wiring Model 1181 SO to Model Hx438 and Gx448 sensors .............. 7
3-1 Range -vs- Dip Switch Position............................................................ 18
3-2 Water Vapor Partial Pressure ............................................................... 20
3-3 Solubility of Oxygen.............................................................................. 20
4-1 LCD Decimal Point Set Up................................................................... 26
5-1 Troubleshooting Guide ......................................................................... 28
ii
1
MODEL 1181 SO SECTION 1.0
GENERAL DESCRIPTION AND SPECIFICATIONS
1.1 FEATURES AND APPLICATIONS
The Rosemount Analytical Two-Wire field mounted
transmitters, with the appropriate sensors, are designed
to continuously measure the pH, ORP, Conductivity,
Dissolved Oxygen, or Free Residual Chlorine in industrial processes.
The Model 1181 Transmitters include all the circuitry necessary for the measurement and transmission of an isolated 4-20 mA linear signal. Measurement range selection is made through internal range switches that are
easily accessed by removing a housing cover. No further
disassembly is required. A matrix is provided which conveniently indicates the proper switch position. Range
selection can be made without the use of the instruction
manual. Fine calibration of the 4-20 mA signal is accomplished with the 20-turn external Zero and Span potentiometers.
The electronic printed circuits are protected from the environment by the NEMA 4X weatherproof, corrosion resistant enclosure. The printed circuit cards plug into a moisture barrier which is isolated from the field wiring and calibration terminals. Routine field calibration does not require
exposing the electronics to harsh industrial environments.
All PCBs are conformal coated for maximum protection.
The PCBs are removed as a unit and may be individually
replaced. The transmitter housing covers are sealed with
large cross sectional O-rings and need not be replaced
each time the cover is removed.
The Model 1181 is available with or without an analog or
digital display. The digital display may be calibrated in
engineering units and the analog display features multiple scales in engineering units.
The transmitters are certified explosion-proof, NEMA 7B,
and intrinsically safe when installed with an approved
barrier and sensor. Hazardous area certificates are provided by BASEEFA to CENELEC regulations, FM and
CSA.
Accessory items are available for the two-wire transmitters. The Model 515 Isolated Power Supply provides
power for up to 20 transmitters. Two transmitters may be
wired directly to the power supply. For more than two
transmitters, junction boxes are available, each accommodating wiring for a maximum of ten transmitters.
Remote alarms are available with independently
adjustable set points and hysteresis. Contacts of the
Model 230A may be specified for high/low, high/high, or
low/low operation. The impedance of the Model 230A
Alarm Module is less than 100 ohms. For further information on the Models 515 and 230A, please refer to to
their respective product data sheet.
The Model 1181SO Transmitter is designed for use with
the Models Hx438 and Gx448 Steam Sterilizable
Dissolved Oxygen Sensors used for sanitary applications in food, beverage, and pharmaceutical industries.
Switch selectable measurement ranges are 0-100, 0200 and 0-800 mm Hg. The 1181SO includes a standby
position on the range switch which maintains the polarizing voltage on the sensor to enable faster response after
removal and replacement into the vessel.
SECTION 1.0
DESCRIPTION AND SPECIFICATIONS
• TWO-WIRE FIELD MOUNTED TRANSMITTERS. Ideal for multiple loop installations where
central data processing and control are required. Field mounting near the sensor for ease in
routine calibration.
• NEMA 4X WEATHERPROOF, CORROSION-RESISTANT, DUAL COMPARTMENT HOUSING
provides maximum circuit protection for increased reliability in industrial environments.
• HAZARDOUS AREA INSTALLATION. Certified NEMA 7B explosion-proof and intrinsically safe
when used with an approved sensor and safety barrier.
•
COMMONALITY OF PARTS reduces inventory required to support different field measurements.
• SWITCH SELECTABLE RANGES further reduces inventory by permitting calibration of one
Model to virtually any Tag Number requiring the same measurement.
• EXTERNAL ZERO AND SPAN, 20-turn potentiometers provide for fine calibration of the isolated 4-20 mA output signal.
2
MODEL 1181 SO SECTION 1.0
DESCRIPTION AN SPECIFICATIONS
1.2 SPECIFICATIONS
PHYSICAL SPECIFICATIONS – GENERAL
Enclosure: NEMA 4X, weatherproof and corrosion-
resistant
NEMA 7B, explosion proof
Hazardous Area Classification:
Explosion Proof (1181 PB & SO):
FM: Class I, Groups B, C, & D, Div. 1
Class II, Groups E, F, & G, Div. 1
Class III
CSA: Class I, Groups C & D
Class II, Groups E, F, & G
Class III, Encl 4
Class I, Groups A, B, C, & D, Div. 2
Encl 4, Factory Sealed
Intrinsic Safety (1181 PB & SO):
FM: Class I, II, III, Div. 1
CSA: Class I, Groups A, B, C & D, Encl 4
Temperature Code T4
CENELEC: Ex ia IIB T4 (Tamb = 55°C)
Display:
Analog: plug in, 90 degree, 2.5 inch diameter
1181PB: triple scale, 0-5, 0-10, 0-20 ppb X10
1181SO: triple scale, 0-100, 0-200, 0-800 mm Hg
Digital: 3.5 digit, LCD, adjustable range in engineering units
Recommended Cable: Transmitter to Power Supply
Two Wire, 18 AWG, shielded, Belden 8760 or equal
(Rosemount Analytical P/N 9200001)
Weight/Shipping Weight:
Blind: 1.44 kg/1.89 kg (3.18 lbs/4.18 lbs)
Analog/Digital: 2.15 kg/2.6 kg (4.74 lb/5.75 lb)
PERFORMANCE SPECIFICATIONS – GENERAL
Power Supply Requirements:
(See Load/Supply Chart)
Lift Off Voltage:
Blind & Analog: 10 VDC
Digital: 12.5 VDC
Maximum Operating Power: 40 milliwatts
Output:
Blind & Analog: Isolated 4-20 mA into 700 ohms
at 24 VDC
Digital: Isolated 4-20 mA into 575 ohms at 24 VDC
Input/Output Isolation: 600 Volts
Ambient Temperature: –30° to 70°C
Relative Humidity: 0-90%
Digital Display Accuracy: 0.1% reading ±1.0 count
Analog Display Accuracy: ±2.0%
External Zero: ±7.0% full scale
External Span: ±7.0% full scale
Shock: 10G maximum for 10 milliseconds
Vibration: 0.025 inches double amplitude
5 to 50 Hz for 2 hours
EMI/RFI:
EN-61326
PERFORMANCE SPECIFICATIONS @ 25°C
Measurement Range: 0-100, 0-200, & 0-800 mm Hg
with Standby
Accuracy: ±1.0% full scale
Stability: ±0.1% full scale/month, non-cumulative
Repeatability: ±1.0 full scale
Temperature Coefficient: ±0.3 %/°C
Automatic Temperature Compensation: 15 to 50°C
RECOMMENDED SENSORS:
Model Hx438 Steam Sterilizable
Dissolved Oxygen Sensor
Model Gx448 Steam Sterilizable
Dissolved Oxygen Sensor
3
MODEL 1181 SO SECTION 1.0
DESCRIPTION AN SPECIFICATIONS
1.3 ORDERING INFORMATION
Model 1181 Two Wire Transmitter is housed in a NEMA 7B explosion-proof, 4X weatherproof, corrosion-resistant
enclosure and includes all the circuitry necessary for measurement and transmission of an isolated 4-20 mA signal.
The transmitter may be selected with local analog or digital display or as a blind unit.
Code Display (Required Selection)
02 Blind, no indication
03 Analog display
06 Digital display
Code Options (Order as separate line items)
07 ORDER AS P/N 2002577 Two-inch pipe/wall mounting bracket
11 ORDER AS P/N 9240594 Stainless steel nameplate (specify marking)
Code Agency Approvals
67 FM Explosion proof and Intrinsically Safe
69 CSA Explosion proof and Intrinsically Safe
73 CENELEC Intrinsically Safe/CE
Former Options
MODEL
1181SO TWO-WIRE TRANSMITTER
DIGITAL DISPLAY
LOAD/POWER SUPPLY REQUIREMENTS
+45 VDC @ 600 OHMS MIN. 1750 OHMS MAX.
12.5 VDC 24 VDC 35.5 VDC @ ZERO LOAD 45 VDC
LIFT OFF NOMINAL MAXIMUM
POWER SUPPLY VOLTAGE
1750 OHMS
@ 45 VDC
600 OHMS
@ 45 VDC
LOAD
RESISTANCE
REQUIRED
1.8 –
1.7 –
1.6 –
1.5 –
1.4 –
1.3 –
1.2 –
1.1 –
1.0 –
0.9 –
0.8 –
0.7 –
0.6 –
0.5 –
0.4 –
0.3 –
0.2 –
0.1 –
0.0 –
OPERATING
REGION
BLIND & ANALOG DISPLAY
LOAD/POWER SUPPLY REQUIREMENTS
+45 VDC @ 600 OHMS MIN. 1750 OHMS MAX.
10 VDC 24 VDC 33 VDC @ ZERO LOAD 45 VDC
LIFT OFF NOMINAL MAXIMUM
POWER SUPPLY VOLTAGE
1750 OHMS
@ 45 VDC
600 OHMS
@ 45 VDC
LOAD
RESISTANCE
REQUIRED
1.8 –
1.7 –
1.6 –
1.5 –
1.4 –
1.3 –
1.2 –
1.1 –
1.0 –
0.9 –
0.8 –
0.7 –
0.6 –
0.5 –
0.4 –
0.3 –
0.2 –
0.1 –
0.0 –
OPERATING
REGION
1181 SO 01 67 EXAMPLE
NOTE: Recommended cable from +24 volt DC power supply to Model 1181SO is Belden 8760 (PN 9200001); specify length.
MODEL 1181SO SECTION 2.0
INSTALLATION
SECTION 2.0
INSTALLATION
4
2.1 UNPACKING AND INSPECTION. Before opening
the shipping carton, inspect the outside of the carton
for any damage. If damage is detected, contact the
carrier immediately. If there is no apparent damage,
open the carton and inspect the instrument and hardware. Make sure all the items in the packing list are
present and in good condition. Notify the factory if any
part is missing. If the instrument appears to be in satisfactory condition, proceed to Section 2.2, Mechanical
Installation.
NOTE:
Save the original packing cartons and
materials as most carriers require
proof of damage due to mishandling,
etc., also, if it is necessary to return
the instrument to the factory, you must
pack the instrument in the same manner as it was received (refer to Section
7.0 for return instructions).
2.2 MECHANICAL INSTALLATION.
IMPORTANT:
Do not attempt to install and operate
the 1181SO without first reading this
manual.
2.2.1 General. The transmitter may be installed in
harsh environments. However, it should be located in
an area where sources of temperature fluctuations,
vibrations, and shock are at a minimum or non existent. Pick a site that is at least 12 inches away from any
high voltage conduit and is easily accessed by operating and maintenance personnel.
2.2.2 Transmitter Installation. The 1181SO may be
mounted on a flat surface or on a 2-inch pipe by means
of a pipe mounting bracket (PN 2002577). There are
two threaded mounting holes located in the bottom of
the 1181SO housing (see Figure 2-1).
2.3 SENSOR INSTALLATION. Refer to the appropri-
ate Model Hx438 or Gx448 Sensor Instruction Manual
for proper installation. Do not install the sensor until the
calibration procedure is performed.
2.4 ELECTRICAL INSTALLATION.
2.4.1 Transmitter. Refer to Figure 2-2 for the wiring
details of the 1181SO. See Section 1.2 for the electrical specifications.
The transmitter is equipped with two 1/2-inch conduit
openings, one on each side of the housing. One is for
power supply and signal wiring and the other is for
sensor input (see Figure 2-1).
To access the terminal boards, remove the cover on
the terminal (or meter) end of the transmitter, then
remove the meter assembly from the transmitter housing. The upper terminal block (TB1) is for the power
supply and meter connections. The lower terminal
block (TB2) is for the sensor input connections.
2.4.2 Wiring Procedure.
Connect the power wiring as follows:
+ VDC Power Supply to TB1-1
- VDC Power Supply to TB1-3
Connect the meter wiring as follows:
+ Meter Terminal to TB1-2
- Meter Terminal to TB1-3
Signal Wiring (4-20 mA DC output) is the same as for
power supply wiring:
+ Loop Signal to TB1-1
- Loop Signal to TB1-3
NOTE:
It is recommended that the power supply/signal wiring be twisted pairs
enclosed in a shielded cable. The
cable should be grounded in only one
place preferably at the instrument.
The instrument case shall be grounded.
Signal or sensor wiring should never
be run in the same conduit or open
tray with AC power line, alarm, control
or output signal cables. Keep signal or
sensor wiring at least 12 inches from
heavy electrical equipment. (Note continued on page 6).
MODEL 1181SO SECTION 2.0
INSTALLATION
5
FIGURE 2-1 Mounting and Dimensional Drawing
MODEL 1181SO SECTION 2.0
INSTALLATION
NOTE CONT.
For maximum EMI/RFI protection the output
cable should be shielded and enclosed in an
earth grounded, rigid metal conduit. Connect
the output cable’s outer shield to the transmitter’s earth ground via the ground terminal next
to TB-1.
The sensor cable should also be shielded.
Connect the sensor cable’s outer shield to the
transmitter’s earth ground via the ground terminal next to TB1. If the sensor cable’s outer
shield is braided an appropriate metal cable
gland fitting may be used to connect the braid
to earth ground via the instrument case.
A new addition to the suite of tests done to
ensure CE compliance is IEC 1000-4-5. This is
a surge immunity test that simulates overvoltages due to switching and lightning transients.
In order to meet the requirements of this test,
additional protection must be added to the
instrument in the form of a Transient Protector
such as the Rosemount Model 470D. This is a
3½-inch tube with ½-inch MNPT threads on
both ends. Inside the tube are gas discharge
and zener diode devices to limit surges to the
transmitter from the current loop. No additional protection is needed on the sensor connections.
2.4.3 Sensor.
Carefully insert the spade lug terminated sensor cable
through the conduit opening. Connect the sensor to
TB2 as shown in Figure 2-2.
NOTE:
Conduit connections on the transmitter housing must be sealed or plugged (with a sealing
compound) to avoid accumulation of moisture
in the housing.
Please refer to the sensor's instruction manual
for additional information on its wiring.
IMPORTANT:
Make sure all wiring connections are correct
and tight. Do not apply power to the 1181SO at
this time.
For wiring to the Model Hx438 and Model Gx448
Dissolved Oxygen Sensors, please see Table 2-1.
2.5 HAZARDOUS LOCATIONS-EXPLOSION PROOF
INSTALLATION. In order to maintain the explosion
proof rating for installed transmitter, the following conditions must be met:
1. The transmitter enclosure covers must be on hand
tight, and the threads must not be damaged
NOTE:
These covers seat on O-rings which
serve to provide a dust proof enclosure
for Class II and Class III installations.
2. Conduit must be properly installed with appropriate
seals.
3. If one of the conduit connections on the housing is
not used, it must be closed with a threaded metal
plug with at least five threads engaged.
4. The serial tag cover on the external ZERO and
SPAN adjustments must be in place.
5. FM Explosion proof installation must be in accordance with Drawing Number 1400155 (See Figure
2-3).
6. Due to the nature of the measurement, sensors
cannot be designed to meet explosion proof certification. If the sensors must be installed in hazardous area locations, Rosemount Analytical Inc.
recommends that an intrinsically safe system be
installed.
2.6 HAZARDOUS LOCATIONS-INTRINSICALLY
SAFE INSTALLATION. To secure and maintain intrinsi-
cally safe installations for the appropriate approval
agency, the following conditions must be met:
1. Code 67 must be specified when ordering F.M. units.
Installation must be in accordance with Drawing Number
1400153 (Figure 2-4 Entity Approved Installation).
2. Code 69 must be specified when ordering CSA units and
installation must be performed in accordance with
Drawing Number 1400157 (Figure 2-5).
3. Code 73 must be specified when ordering CENELEC
units and installation must be performed in accordance
with Drawing Number 1400143 (Figure 2-6).
6
MODEL 1181SO SECTION 2.0
INSTALLATION
7
TABLE 2-1. Wiring Model 1181 SO Transmitter to
Model Hx438 and Gx448 DO Sensors
FIGURE 2-2. Model 1181 SO Wiring Details
TB2 MEASUREMENT WIRE COLOR
1 RTD IN Blue
2 RTD Sense Yellow
3 Cathode Clear
4 Anode Brown
Ground Yellow/green
MODEL 1181SO SECTION 2.0
INSTALLATION
8
FIGURE 2-3. FM Explosion-Proof Installation
DWG. NO. REV.
1400155 C
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