Endress+Hauser mycom COM 121 User manual

BA 106C/07/en/09.97
Software version 6.02 or later
No. 50063021
mycom
COM 121 / 151
O2/ Temperature
Transmitter / Controller
Operating Instructions
µ

Please familiarise yourself with the instrument
before you take any other steps:
You wish to operate or reconfigure the instrument.
The operating concept is explained in these chapters:
When you encounter problems or when the instrument
requires maintenance, please refer to these chapters
for help:
General information
You wish to install and start up the instrument.
The required steps are described in these chapters:
Safety
Description
Installation
Start-up
Operation
Calibration
Description of operating functions
Limit contacter/time interval control
Diagnosis
Service and maintenance

Table of contents
1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 Symbolsused ......................................................... 2
1.2 Conformity statement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2 Safety ............................................................... 3
2.1 Intended application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2 Generalsafetynotes.................................................... 3
2.3 Safetyfunctions........................................................ 3
3 Description........................................................... 4
3.1 Areas of application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Measuring system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.3 Ordercode ........................................................... 5
3.4 Technicaldata......................................................... 6
4 Installation........................................................... 8
4.1 Storage and transport . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2 Unpacking............................................................ 8
4.3 Mounting ............................................................. 8
4.4 Mounting accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.5 Connection........................................................... 11
4.6 Connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Start-up............................................................. 14
5.1 Measures before first power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Instrument status after first power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Measures after first power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.4 Power failure handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Operation........................................................... 15
6.1 Generalnotesonoperation.............................................. 15
6.2 Keyfunctions......................................................... 16
6.3 Hold function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.4 Operating matrix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7 Calibration.......................................................... 20
7.1 Calibration sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8 Description of operating functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
9 Limit contacter and time interval control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.1 Limit contacter function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9.2 Switching contact configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9.3 Alarm function / fault signalling contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
9.4 Time interval control (timer function). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10 Diagnosis........................................................... 33
10.1 Error classes and error numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.2 Error display and handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10.3 Errorlist............................................................. 34
11 Service and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
11.1 Cleaning............................................................. 36
11.2 Repairs.............................................................. 36
11.3 Preparation for storage, proper disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
11.4 Accessories.......................................................... 37
11.5 Index ............................................................... 38
mycom COM 121 / 151 Table of contents
Endress+Hauser 1

1. General information
1.1 Symbols used
Warning
This symbol alerts to hazards which
may cause irreparable damage.
Caution
This symbol alerts to possible
malfunction due to operator error.
Note
This symbol indicates important
items of information.
1.2 Conformity statement
The Mycom COM 121 / 151 has been
developed and manufactured in accordance
with currently valid European standards and
directives.
Note:
The corresponding certificate of
conformity may be requested from
Endress+Hauser.
General information mycom COM 121 / 151
2Endress+Hauser

2. Safety
2.1 Intended application
Note:
These installation and operating
instructions describe the O2
instrument Mycom COM 121 / 151
equipped with all the options.
The Mycom COM 121 / 151 is a
microprocessor-based measuring
and control instrument used to
determine the dissolved O2value.
State-of-the-art engineering allows
the instrument to be adapted to all
dissolved oxygen measuring tasks in
a simple manner.
A bilateral limit monitor with two
additional long-term time generators
permits oxygen control and auto-
matic nitrification/denitrification
control systems to be implemented.
Digital interfaces require separate
operating instructions from the
Mycom family of instruments:
Mycom Serial Interfaces
BA 090C/07/en
The separate operating instructions
BA 965C/07/en are required for the
oxygen sensors COS 3 / COS 3S.
2.3 Safety functions
•Access code: Unauthorised access to the
calibration and configuration data of the
measuring transmitter is effectively
prevented by access codes. The instrument
settings can be read at any time without
entry of an access code.
•Alarm function: System errors, malfunction
and continued violation of a limit will result in
an alarm signalled by an alarm contact.
The alarm signalling contact is fail-safe by
design, i.e. an alarm condition will also be
signalled in the event of a power failure.
•Data integrity: The instrument configuration
is retained even after a power failure.
•Immunity to interference: This instrument
is protected against interference, such as
pulse-shaped transients, high frequency
and electrostatic discharges, according to
the applicable European standards.
This is only valid, however, for an instrument
connected according to the notes in these
installation and operating instructions.
2.2 General safety notes
Warning:
Operating the instrument in any way
other than as described in these
instructions may compromise the
safety and function of the measuring
system and is therefore impermissible.
Installation, start-up and operation:
The Mycom COM 121/151 instrument
has been designed and
manufactured for safe operation
according to the state of the art in
engineering and conforms to the
relevant regulations and EC
directives (see "Technical data").
However, if used improperly or other
than for the intended purpose, it may
be hazardous, e.g. due to improper
connection.
Installation, electrical connection,
start-up, operation and maintenance
of the measuring system must
therefore be performed exclusively
by trained specialist personnel
properly authorised by the system
operator for such work. The
specialist personnel must have read
and understood these operating
instructions and must adhere to the
instructions contained therein.
BE1OM151.CHP
mycom COM 121 / 151 Safety
Endress+Hauser 3

3. Description
3.1 Areas of application
Typical areas of application are:
•Waste water treatment
•Sewage treatment plants
•Water treatment
•Drinking water
•Water monitoring
•Fish farming
3.2 Measuring system
The measuring system consists of:
•the oxygen sensor COS 3 / COS 3S
•an appropriate immersion or flow assembly
•the O2measuring instrument Mycom COM
151 in the field housing
or
•the Mycom COM 121 instrument in the
housing for panel mounting
Plastic shackle
Star handle
Weather protection cover
Filler plug
Upright post,
square tube
1.4301
Transverse pipe 1.4301
➂
➀
➁
Fig. 3.1: Example of a complete
measuring system with:
➀Mycom COM 151 with weather
protection cover installed
➁Universal suspension assembly
holder
➂O2assembly COA 110-40 with
oxygen sensor COS 3 installed
Description mycom COM 121 / 151
4Endress+Hauser

3.3 Order code
Fig. 3.2: Nameplate of
Mycom COM 121
Mycom COM 121 / 151
Types
121 dissolved O2measuring transmitter for panel mounting, 96 x 96 mm,
ingress protection IP 54 (front)
151 field transmitter, 247 x 167 x 111 mm (H x W x D), ingress protection IP 65
Versions
1 with fault signalling contact
3 with fault signalling contact and 2 limit contacts
9 special version
Measuring range
A 0 ... 20 mg O2/ l
B 0 ... 200 % saturation
Y special version
Power supply
0 230 V AC, 50 / 60 Hz
1 110 V AC, 50 / 60 Hz
2 200 V AC, 50 / 60 Hz
3 24 V AC, 50 / 60 Hz
4 48 V AC, 50 / 60 Hz
5 100 V AC, 50 / 60 Hz
6 127 V AC, 50 / 60 Hz
7 240 V AC, 50 / 60 Hz
8 24 V DC
Outputs
0 0/4 ... 20 mA for O2
1 0/4 ... 20 mA for O2and temperature
3 0/4 ... 20 mA for O2with additional RS 232-C interface
6 0/4 ... 20 mA for O2value
with additional RS 485 / E+H Rackbus interface
9 special version
COM – ⇐complete order code
Fig. 3.3:
Nameplate of
Mycom COM 151
BE1OM151.CHP
mycom COM 121 / 151 Description
Endress+Hauser 5

3.4 Technical data
Electrical data
O2measurement with oxygen sensors COS 3 / COS 3S
Display range O2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 …20 mg / l ; 0 …200 % SAT
Measured value resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . <0.5 % of upper range value
Zero point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sensor has no zero current
Automatic temperature compensation range . . . . . . . . . . 0 …50 °C ; –20 …+60 °C with SAT
Status indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LEDs, red or red / green
Temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 NTC (in O2sensor)
Air pressure measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . integrated pressure sensor
Reference temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20 °C
O2signal input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . max. 8 V at 200 kΩ
Slope adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 60 …120 % referred to normal conditions
Normal conditions . . . . . . . . . . . . . . . . . . . . . . approx. –4 mV / mbar O2(1013 mbar, 20 °C)
O2signal output (galvanically separated) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 / 4 ... 20 mA
Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. max. 600 Ω
O2signal output range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . adjustable from ∆2 …∆20 mg / l
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . or from ∆20 …200 % SAT
Temperature measurement
Temperature measuring range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10 …+60 °C
Temperature signal output (variant). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 or 4 …20 mA
Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. max. 400 Ω
Temperature output range . . . . . . . . . . . . . . . . . . . . . . . . . . . . adjustable from ∆25 …∆165 K
Temperature calibration offset . . . . . . . . . . . . . . . . . . . . . . . . . adjustable from –3.0 …+3.0 °C
Limit contacter, timer and alarm functions
Limit contacter / time interval control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 contact outputs
Function type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MIN or MAX (direct / inverted)
Setpoint settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 …20 mg / l or 0 …200 % SAT
Hysteresis for switching contacts . . . . . . . . . . . . . . . . . . . . . . . 0 …5 mg / l or 0 …50 % SAT
Timer interval period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 …1440 min
Contact delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . pickup / dropout
Delay period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 …6000 s
Alarm threshold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 …10 mg / l or 0 …100 % SAT
Alarm delay period. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 …6000 s
General technical data
Measured value display . . . . . . . . . . . . . . . . LC display, 7 segments, 4 digits, height = 10 mm
Indication error of measurement
Display (acc. to DIN IEC 746) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2 %
Measured value output (acc. to DIN IEC 746). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 %
Status indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . LEDs, red and red / green
Electromagnetic compatibility (EMC)
Emission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . according to DIN EN 50081-1, 01.92
Immunity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . according to DIN EN 50082-1, 03.93
Ambient temperature, nominal operating range . . . . . . . . . . . . . . . . . . . . . . . . . –10 …+55 °C
Ambient temperature, limit operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20 …+60 °C
Ambient temperature for storage and transport . . . . . . . . . . . . . . . . . . . . . . . . . –25 …+85 °C
Relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 …90 % (non-condensing)
Description mycom COM 121 / 151
6Endress+Hauser

Electrical data (continued)
Physical data
Electrical data and connections
AC power supply . . . . . . . . . . . . . . . . . . 24, 48, 100, 110, 127, 200, 230, 240 V, –15 …+10 %
Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 …60 Hz, ±6 %
DC power supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 V, –20 …+15 %
Power consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 VA
Contact outputs on COM 121 . . . . . . . . . . . . . . 2 changeover contacts, 1 floating NO contact
Contact outputs on COM 151 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 changeover contacts
Switching voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . max. 250 V AC
Switching current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . max. 3 A
Switching power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . max. 500 VA
Signal outputs . . . . . . . . . . . . . . . . . . . . . . . . . . 1 or 2 x 0 / 4 …20 mA, galvanically separated
Insulation voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 Vp-p
Auxiliary power supply output . . . . . . . . . . . . . . . . . . . . . . . . ±8.5 V, max. 10 mA (Ri= 400 Ω)
Digital interface (variant) . . . . . . . . . . . . . . . . . . optionally RS 232-C, RS 485 or E+H Rackbus
Hold input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ext. floating NO contact
Input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . max. 10 mA
Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . terminal block, removable
Max. conductor cross section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 mm2
Dimensions / weights / protection
COM 121
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 x 96 x 176.5 mm (HxWxD)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 kg
Ingress protection (front) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IP 54
Housing material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . polycarbonate
Front of housing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . polyester
COM 151
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247 x 167 x 111 mm (HxWxD)
Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 kg
Ingress protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IP 65
Housing material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GD-ALSI (Mg component > 0.05 %)
Paintwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-component PU-varnish
Front of housing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . polyester, UV-resistant
BE1OM151.CHP
mycom COM 121 / 151 Description
Endress+Hauser 7

4. Installation
4.1 Storage and transport
The packaging material used to store or
transport the instrument must provide shock
and moisture protection. Optimal protection
is provided by the original packaging
materials. Conformance with the ambient
conditions (see technical data) must be
assured.
4.2 Unpacking
•Inspect for any damaged packaging!
The post office or freight carrier must be
informed of any damage.
Damaged packaging material must be
retained until the matter has been settled.
•Verify that the contents are undamaged!
Inform the post office or freight carrier as
well as the supplier of any damage.
•Check that the delivery is complete and
agrees with the shipping documents. Refer
to the nameplate (see fig. 3.2 or 3.3) to
verify that you have received the instrument
type and version ordered.
The scope of delivery of the Mycom
COM 121 (panel-mounted unit) comprises:
•2 housing fastening elements
(order no. 50047795)
•1 submin D connector (only for instruments
equipped with a digital interface)
(order no. 50051998)
•Installation and operating instructions
•Instrument identification card(s)
The scope of delivery of the Mycom
COM 151 comprises:
•1 housing mounting kit
(order no. 50061357)
•1 measuring point identification label
(order no. 50061359)
•Installation and operating instructions
•Instrument identification card(s)
If you have any questions, consult your
supplier or the Endress+Hauser sales agency
in your area (see back cover of these
installation and operating instructions for
addresses).
4.3 Mounting
The instrument can be mounted as follows:
•COM 121: panel installation
•COM 151: – panel installation
CPM 151-P:– wall installation
CPM 151-P:– post installation
Panel installation of COM 121
The mounting cutout required according to
DIN 43 700 is 92+0.5 x 92+0.5 mm.
The instrument is installed using the supplied
housing mounting elements. The required
installation depth is approx. 180 mm.
µ
Mounting cutout:
92+0.5 x 92+0.5 mm
96
96
121-ABM.EPS
92
56
32
max. 176.5
max. 45
Flat packing
(included)
Fig. 4.1: Dimensions of
Mycom COM 121/151
Installation mycom COM 121 / 151
8Endress+Hauser

Dimensions of COM 151
Wall installation of COM 151
Install the mounting brackets on the rear of
the instrument according to fig. 4.4.
Refer to figs. 4.2 and 4.3 for the housing and
mounting dimensions of the field housing.
Panel installation of COM 151
The instrument is installed using the supplied
housing fastening elements (see fig. 4.5).
A flat packing (see chapter 11.4) is required
to seal the panel cutout.
The cutout required for panel mounting is
161+0.5 x 241+0.5 mm (W x H).
Fig. 4.2 : Dimensions of
(left) Mycom COM 151
➀Brackets for wall installation
Fig. 4.3: Rear of field housing
(right) with mounting brackets
installed
Note:
Mounting brackets and screws for
wall installation are included in the
housing mounting kit supplied with
the instrument.
167
247
PM151A02.EPS
188
➀
95 58
PM151A06.EPS
➀
➁
111
Fig. 4.4: Bottom of field housing
with brackets for wall
mounting installed
➀Screw plugs for Pg 13.5
➁Mounting brackets
132
PM151A05.EPS
➀
➁
Fig. 4.5: Bottom of field housing
with mounting dimensions
and tensioning screws for
panel mounting installed
➀Screw plugs for Pg 13.5
➁Tensioning screws
PM151A09.EPS
80
80
For screw ∅
6 mm
BE1OM151.CHP
mycom COM 121 / 151 Installation
Endress+Hauser 9

Post installation of COM 151
The Mycom COM 151 (field housing) can be
installed on vertical or horizontal tubing with a
max. diameter of 70 mm using parts supplied
with the housing mounting kit.
These mounting parts are to be installed on
the rear of the instrument according to fig. 4.6.
Refer to chapter 11.4 regarding other
accessories available for the Mycom
COM 151.
Fig. 4.7: Round post mounting for
weather protection cover
CYY 101 if not installed on
assembly holder CYH 101
;MONTAGE.EPS
Fig. 4.6: Panel installation and
post mounting of
Mycom COM 151
Caution:
Outdoor installation
Long-term, direct exposure of the
instrument front to solar radiation is
to be avoided.
Install weather protection cover
CYY 101 in these cases.
4.4 Mounting accessories
Weather protection cover CYY 101
Weather protection cover CYY 101 can be
attached directly to the upright post of
assembly holder CYH 101 by means of two
M8 screws (see fig. 4.8, mounting position ➀).
Two round post mounting brackets (see fig.
4.7, order no. 50062121) are required to
install the weather protection cover on vertical
or horizontal tubing or posts with a max. cross
section of 60 mm.
300
270
320
➂
➃
➀
YH-101-6.EPS
➁
➁ ➁
➁
➃
90 70
M6
30
66
55
YH-101-7.EPS
8
CYH101-1.EPS
Fig. 4.8: Weather protection cover
(left) CYY 101 with dimensions and
mounting positions for:
➀Installation on upright post CYH 101
with two M8 screws
➁Installation on vertical or horizontal
tubing with 2 round post mounting
brackets
➂Installation of O2meas. transmitter
Mycom COM 151
➃Wall installation
Fig. 4.9 Weather protection cover CYY
(right) 101 with Mycom COM 151
installed on upright post
Installation mycom COM 121 / 151
10 Endress+Hauser

Junction box VS
(Order No. 50001054)
Junction box VS, equipped with a plug-in
socket, is required to extend the length of the
standard connecting cable supplied with the
COS 3 / COS 3S oxygen sensor (max. length
15 m).
Junction box VS is equipped with a 7-pin plug
for the sensor and a cable gland for the signal
line extension.
Ingress protection of junction box is IP 65.
Recommended extension cable:
Type OMK (order no. 50004124)
4.5 Connection
The following connections must be
established:
•Mains connection
•Switching contact connection (depending
on instrument version)
•O2signal output (0/4 ... 20 mA) connection if
required
•O2sensor COS 3 / COS 3S
Warning:
Work under tension and connection
to the mains may only be performed
by properly trained personnel.
A mains disconnecting device must
be installed close to the instrument
and identified as a mains
disconnecting device for the
COM 121 / 151 (see EN 61010-1).
Before connecting the instrument to
the mains, make sure the mains
voltage matches the voltage rating
on the nameplate.
Note:
This instrument has been designed
and tested according to the
applicable European regulations with
regard to electromagnetic
compatibility.
However, optimal EMC protection is
only guaranteed for a properly
grounded instrument with a screened
measured value output line.
Keep the screen connection to the
grounding terminal (PE) as short as
possible.
Do not solder an extension onto the
screen!
This also applies to the connection of
junction box VS.
Ground the upright post when
installing the field housing
(COM 151) to increase immunity to
interference. Running the cable in the
post will improve interference
suppression.
After installing and connecting the
instrument and sensors, the entire
measuring system must be checked
for proper function.
➁
➀
82
160
80
VS-B02.EPS
Mounting height approx. 55 mm
Fig. 4.10: Junction box VS for
extension of connecting
cable between oxygen
sensor and instrument
➀Plug-in connector
➁Pg 13.5 cable gland
BE1OM151.CHP
mycom COM 121 / 151 Installation
Endress+Hauser 11

Connection of COM 151
The mains and the signal lines are connected
to the terminal strip in the separate
connection compartment (see fig. 4.10). A
plug-in connector is provided for connecting
the O2sensor.
•Replace the screw plugs underneath the
instrument with the corresponding number
of Pg cable glands.
•Introduce the connecting cables through
the Pg cable glands (see fig. 4.10).
•Connect the instrument according to the
connection diagram (see fig. 4.11).
Signal cables must be spatially separated
from mains and power cables.
•Tighten the cable glands.
•Install the cover on the separate terminal
connection compartment and tighten the
cover screws.
Connection of COM 121
The signal, mains and switching contact
connections to the instrument are established
via the (removable) terminal strip.
Installation
Terminals
Cross section:
Temperature
output on
COM 121:
4.0 mm2
2 terminals with a max.
cross section of
2.5 mm2
Optionally
connectable:
1 wire with 2.5 mm2
1 wire with 4.0 mm2
2 litz wires with 1.5 mm2
each and end sleeves
1 litz wire with 2.5 mm2
and end sleeve
Terminal
designations:
acc. to DIN 45140
OM151W01
➀
➁➂
Fig. 4.10: Mycom COM 151
with connections in
separate terminal
connection compartment
➀Plug-in connection for O2sensor
COS 3 / COS 3S
➁Meas. signal output, interface
➂Power supply
Cable lengths available for oxygen sensor COS 3/COS 3S Extension cable
COS 3 : 1.5 / 7 / 15 m
COS 3S : 1.5 / 7 / 15 m
Special sensor versions up to 50 m
OMK
Use junction box VS for extension (max. total cable length: 100 m)
Installation mycom COM 121 / 151
12 Endress+Hauser

4.6 Connection diagram
Note:
The connection diagram shows the
fully equipped unit! Terminal
designations in parentheses only
apply to the Mycom COM 151!
Please also note the connection
diagram on the instrument
(COM 121) or inside the connection
compartment (COM 151).
1) Instrument version optionally with
temperature signal output or
serial digital interface (terminals
33 und 34) according to order
code (see chapter 3.3).
2) Contact status shown:
no current or fault present
Terminal 43 does not exist on COM 121.
All switching contacts are thoroughly
interference-suppressed.
External loads connected may
have to be additionally
interference-suppressed.
3) 24 V DC: floating or minus pole grounded
4) When operating more than one Mycom
series instruments, each hold input
requires its own potential-free contact.
Alarm
O2
NTC
Fig. 4.11: Electrical connection of
Mycom COM 121 / 151
Type 151: L+ L- 24 V DC3)
Type 121: L+ L- 24 V DC3)
Mains
voltage
Switching
contact 1
Temperature
signal
output 1)
mA
8.5 V DC
O2
mA
S
S344142575958 47 4948 L N PE
110 12 13 85 82 S 31 32
O2signal
output
HOLD
input4)
Switching
contact 2
Fault signaling
contact
(closed circuit
connection 2)
33 (43)
OM151CON.EPS
ϑAlarm
83 84
Serial interface 1)
RS 485 RS 232-C 1)
AC
81
ϑO2
blye bn gy pk wt gn
Oxygen sensor COS 3
4152 3 7 6
blye bn gy pk wt gn
Plug-in connection for COM
151 or COM 121 with junction
box VS
RS 232-C RS 485
TXD b. 121 +5 V 7 2
RXD Data (A) 34 3
GND GND 5 5
TXD b. 151 Data (B) 33 7
Type 151:
Terminals
Type 121:
Submin D connector
BE2OM151.CHP
mycom COM 121 / 151 Installation
Endress+Hauser 13

5. Start-up
5.1 Measures before first
power-up
Familiarise yourself with the operation of the
measuring transmitter before switching it on
for the first time.
Caution:
•Make sure all connections have
been established correctly before
power-up!
•Make sure the oxygen sensor is
connected.
Warning:
•Before power-up make sure that
there is no risk of damage to the
system the instrument is a part of;
for example, due to valves or
pumps that might operate in an
uncontrolled manner, etc.
5.2 Instrument status after
first power-up
•After power-up, all LCD segments of the
display are briefly activated (approx. 2 s),
and all LEDs turn red. Then the unit starts
measuring (matrix position V0 / H0).
The operating and start-up levels are
locked.
Note:
The instrument automatically
starts up in matrix field V0 / H0
(measurement) following
interruptions in operation.
5.3 Measures after first
power-up
•Calibrate the instrument as described in
chapter 7.
Also observe the operating instructions for
the oxygen sensor COS 3/COS 3S.
5.4 Power failure handling
•In the event of a power failure with a
maximum duration of 20 ms, measuring
operation continues.
•If there is a power failure with a duration of
more than 20 ms, measuring operation is
interrupted, but the values entered for the
parameters are retained.
•When the operating voltage returns, the unit
resumes measuring operation as described
in chapter 5.1.
Start-up mycom COM 121 / 151
14 Endress+Hauser

6. Operation
6.1 General notes on operation
The operation of the unit is matrix-oriented,
i.e. each function of the instrument is
assigned one position in a 10 x 10 field matrix
(fields V0 / H0 to V9 / H9, see double page
19/20).
The operating functions are selected via the V
(vertical) and H (horizontal) keys. These keys
step through the matrix fields, including those
which have not been assigned. The key
functions are explained in chapter 6.2.
The functions of the matrix are grouped into
3 levels according to their purpose:
•Level 0: Indication
(O2concentration, saturation
index, temperature)
•Level 1: Operation
(calibration, hold)
Code entry: 1111
•Level 2: Start-up
(current output assignment,
damping; controller functions)
Code entry: 2222
Without previous entry of code 1111 or 2222,
the content of the matrix fields is only
displayed and cannot be modified.
All matrix fields where the corresponding
function has not been activated display:
Unlocking the levels
•Select matrix field V0 / H0 and press the E
key
•The code number last entered is displayed
in field V8 / H9
•Unlock level 1 Operation by entering
code 1111 or
•level 2 Start-up (including level 1
Operation) by entering code 2222
•Acknowledge by pressing the E key
•Return to matrix field V0 / H0 (measured
value display) by pressing the V and H keys
simultaneously
Locking levels 1 and 2
Proceed as described above but enter any
value except 1111 or 2222.
The instrument is automatically locked (code
0000) following interruptions in operation.
Measured
value
display
OM151A03.EPS
Display of
selected
matrix field
position
Indicator /
status arrows
Relay switching
state LEDs
Alarm LED
Function keys:
Horizontal matrix
field selection
Digit selection
Accept
value
Section of
operating matrix
Function keys:
Vertical matrix
field selection
Increase value
Decrease value
Fig. 6.1: Mycom COM 121 / 151
Front view of instrument
with display and operating
elements
BE3OM151.CHP
mycom COM 121 / 151 Operation
Endress+Hauser 15

6.2 Key functions
OM151A4L.EPS
OM151A4R.EPS
Matrix position
V / H
V key:
Selection of row:
matrix fields V0 to V9
Each key stroke increases the V
(row) display value by one.
H key:
Selection of column:
matrix fields H0 to H9
Each key stroke increases the H
(column) display by one.
Example:
To select matrix field
V1 / H2:
Press V key 1 time
Press H key 2 times
Value range
for display or entry
Display for locked matrix fields:
Display for matrix fields that can be
changed: digit that can be edited
flashes.
Use these keys to enter values and
select functions:
Increase value
Decrease value
– Select digit:
This key cycles from 1st digit
to 2nd digit, 3rd digit, etc.
– Start editing
– Recall after E
Accept matrix field value
displayed or modified.
Operation mycom COM 121 / 151
16 Endress+Hauser

Note:
1. Code 0000 is always displayed in
matrix field V8 / H9 when the
instrument is started up for the first
time or after power failures.
2. Only matrix field V8 / H9 can be
selected directly with the ,, E “ key.
All other matrix fields must be
accessed by means of individual
selection with the ,, V “ and ,, H “ keys.
3. Jumping back to matrix field
V0 / H0 by pressing the ,, V “ and
,, H “ keys at the same time is
possible from any matrix field
position.
6.3 Hold function
Activation of the hold function freezes the
existing current outputs to their present
values. In automatic operation, all contacts go
to their normal positions. Any accumulated
alarm time is reset to 0.
This function is advantageous e. g. for
performing a calibration, maintenance work
etc. It guarantees a constant controller output
for external control by using the Mycom’s
current output.
The hold function can be activated in three
different ways:
•by manual switching on and off at the device
•as a special calibration hold during sensor
calibration only
or
•by external triggering (potential-free
normally open contact) at the hold input.
Manual activation of HOLD
By entering ,,1“ in the matrix field V0 / H2,
HOLD is switched on. Entering ,,0“ terminates
HOLD.
HOLD during calibration
HOLD during calibration is preselected by
entering ,,1“ in the matrix field V1 / H9.
Advantage: When measuring operation is
resumed after completed calibration, HOLD
is automatically switched off. This ensures a
correct return to correct control or measured
value recording. A delay time of 3 min for
adapting the sensor to the medium is taken
into account automatically.
Activation of HOLD by external triggering
HOLD is activated as long as the connection
between terminals 81 and 82 is closed by an
external switching contact.
Warning:
If several Mycom devices are
operated, then each HOLD input
needs its own potential-free contact.
BE3OM151.CHP
mycom COM 121 / 151 Operation
Endress+Hauser 17

Basic functions 1 V0
H0
Measurement
0.0 to 22.0 mg/l
0.0 to 220.0 % SAT V0
H1
Temperature
display
–20 to +60 °C
1111
V0
H2
Default: 0 . . . . . . . . . . . . .
HOLD
OFF / ON
0 = OFF
1 = ON
2222
V0
H3
Default: 1 . . . . . . . . . . . . .
Toggle
0 ... 20 mA /
4 ... 20 mA
0 = 0 to 20 mA
1 = 4 to 20 mA
Basic functions 2
1111
V1
H0
Calibration
see description
in chapter 7 V1
H1
Default: 0 . . . . . . . . . . . . .
Toggle
mg/l ↔% SAT
0 = mg/ l
1 = % SAT
V1
H2
Default: 0.0. . . . . . . . . . . .
Entry of
salinity
0.0 to 4.0 %
Limit / contact
configuration
for controller 1
1111
V2
H0
Default: 0.5/5.0 . . mg/l/%
Setpoint entry
for limit contacter/
controller 1
0.00 to 20.00 mg/l
0.0 to 200.0 % SAT
1111
V2
H1
Default: 1 . . . . . . . . . . . . .
Toggle
Auto / Manual
0 = manual
1 = automatic
1111
V2
H2
Manual OFF / ON
Keys
2222
V2
H3
Default: 0 . . . . . . . . . . . . . s
Pickup delay
limit contacter 1
0 to 6000 s
Limit / contact
configuration
for controller 2
1111
V3
H0
Default: 5.0/50.0 . . mg/l/%
Setpoint entry
for limit contacter/
controller 2
0.00 to 20.00 mg/l
0.0 to 200.0 % SAT
1111
V3
H1
Default: 1 . . . . . . . . . . . . .
Toggle
Auto / Manual
0 = manual
1 = automatic
1111
V3
H2
Manual OFF / ON
Keys
2222
V3
H3
Default: 0 . . . . . . . . . . . . . s
Pickup delay
limit contacter 2
0 to 6000 s
Alarm
1111
V7
H0
Default: 0.5/5.0 . . . mg/l/%
Alarm threshold
Alarm for
setpoint + threshold
0.0 to 10.0 mg/l
0.0 to 100.0 % SAT
1111
V7
H1
Default: 0 . . . . . . . . . . . . s
Alarm delay
0 to 6000 s
2222
V7
H2
Default: 0 . . . . . . . . . . . . .
Toggle
steady /
fleeting contact
0 = steady contact
1 = fleeting contact
2222
V7
H3
Default: 0 . . . . . . . . . . . . .
Alarm assignment
0 = both limit contacts
1 = limit contact 1
2 = limit contact 2
Interface
configuration,
unlock / lock
2222
V8
H0
Default: 2 . . . . . . . . . . . . .
Parity
0 = none
1 = odd
2 = even
2222
V8
H1
Default: 1 . . . . . . . . . . . . .
Baud rate
selection
0 = 4800 Bd
1 = 9600 Bd
2 = 19200 Bd
Service and
simulation
V9
H0
Diagnostic code
Error messages
E1 to E255 V9
H1
Service
Displays and clears auto
resets (watchdog
triggering due to
EMC events)
V9
H2
Display
instrument
configuration V9
H3
Software version
Optional functions depending on instrument variant
Operating matrix mycom COM 121 / 151
18 Endress+Hauser