Datasheet K3MA-L Datasheet (OMRON)

Highly Visible LCD Display with 2-color
(Red and Green) LEDs

■ Wide input range - se lect from two types o f plati-

num-resistance thermometers and ten types of
thermocouples.

■ Front-panel key operation for easy setting.

■ Average processing function suppresses flicker.

■ Temperature input shift and temperature unit

selection functions.

■ Easy confirmation of max/min display.

■ Short 8 0-mm depth (me asured from e dge of face

plate).

■ Finger protective cover (standard equi pme nt) p ro -

tects against electric shock.

■ Water- and dust-proof NEMA4X (IP66 equivalent)

front panel.

■ Recognized to U.S. and Canadian requirements

under the Component Reco gnitio n Pr ogram of UL
with CE marking.

K3MA-L Temperature Meter

CUS

Ordering Information

Input type Supply voltage Output Model

Platinum-resistance thermometer or
thermocouple

Model Number Legend:

K3MA-L-@

1 2 3

1. Input T y pe

L: Platinum-resistance thermometer or thermocouple

2. Output Ty pe

None: No output
C: With relay contact output (SPDT)

3. Supply Voltage

100-240VAC: 100 to 240 VAC
24VAC/VDC: 24 VAC/VDC

100 to 240 VAC None K3MA-L 100-240VAC

24 VAC/VDC None K3MA-L 24VAC/VDC

1 relay contact output (SPDT) K3MA-L-C 100-240VAC

1 relay contact output (SPDT) K3MA-L-C 24VAC/VDC

1

Specifications

■ Ratings

K3MA-L 100-240VAC, K3MA-L-C 100-240VAC K3MA-L 24VAC/VDC, K3MA-L-C 24VAC/VDC

Supply voltage 100 to 240 VAC 24 VAC (50/60 Hz), 24 VDC
Operating voltage range 85% to 110% of the rated supply voltage
Power consumption (under

maximum load)
Insulation resistance 20 M

Dielectric withstand voltage 2,000 VAC for 1 min between external terminal and case.

Noise immunity

Vibration resistance

Shock resistance
Ambient temperature Operating:

Ambient humidity Operating: 25% to 85% (with no condensation)
Ambient atmosphere Must be free of corrosive gas.
Approved safety standards UL3121, conforms to EN61010-1 (Pollution degree 2/overvoltage category II)

EMC (EMI) EN61326+A1 Industry

Weight Approx. 200 g

6 VA max. 4.5 VA max. (24 VAC)

W

min. (at 500 VDC) between external terminal and case.

Insulation provided between inputs, outputs, and power supply.

Insulation provided between inputs, outputs, and power supply.



1,500 V on power supply terminals in normal or

common mode.

1 m

s, or 100 ns for square-wave noise with 1 ns.

2

Vibration: 10 to 55 Hz, Acceleration: 50 m/s
5 min each in X, Y, and Z directions for 10 sweeps.

2

150 m/s

Storage:

Conforms to VDE0106/P100 (finger protection)

Emission Enclosure: CISPR 11 Group 1 class A: CISRP16-1/-2
Emission AC Mains: CISPR 11 Group 1 class A: CISRP16-1/-2

(EMS) EN61326+A1 Industry
Immunity ESD: EN61000-4-2: 4-kV contact discharge

Immunity RF-interference: EN61000-4-3: 10 V/m (amplitude-modulated, 80 MHz to 1 GHz)
Electrical Fast Transient Noise: EN61000-4-4: 2 kV (power line)
Immunity Burst Noise: 1 kV line to line (I/O signal line)

Immunity Surge: EN61000-4-5: 1 kV (power line)
Immunity Conducted Disturbance: EN61000-4-6: 3 V (0.15 to 80 MHz)

Immunity Voltage Dip/Interrupting: EN61000-4-11: 0.5 cycle, 0, 180

(100 m/s2 for relay contact outputs) 3 times each on 3 axes, 6 directions.

-10

C to 55C (with no condensation or icing)

-25

C to 65C (with no condensation or icing)

4.5 W max. (24 VDC)



480 V on power supply terminals in normal mode.



1,500 V in common mode.

1 m

s, or 100 ns for square-wave noise with 1 ns.

8-kV air discharge

2-kV line to ground (power line)

,

100% (rated voltage)

K3MA-LK3MA-L

Input/Output Ratings

Relay Contact Output

Item Resistive load (cosf = 1) Inductive load (cosf = 0.4, L/R = 7 ms)

Rated load 5 A at 250 VAC, 5 A at 30 VDC 1.5 A at 250 VAC, 1.5 A at 30 VDC
Rated carry current 5 A max. (at COM terminal)
Max. contact voltage 400 VAC, 150 VDC
Max. contact current 5 A (at COM terminal)
Max. switching capacity 2,000 VA, 192 W 375 VA, 36 W
Min. permissible load

(P level, reference value)
Mechanical life 20,000,000 times min. (at a switching frequency of 1,200 time/min)
Electrical life

(at an ambient temperature of 20

10 mA at 5 VDC

100,000 times min. (at a rated load switching frequency of 10 time/min)



C)

2

■ Measuring Ranges

Platinum-resistance Thermometer

Input Pt100 JPt100



Range

Parameter

C



F

-

200 to 850

-

300 to 1500



-

199.9 to 500.0 0.0 to 100.0

-

199.9 to 900.0 0.0 to 210.0

-

199.9 to 500.0 0.0 to 100.0

-

199.9 to 900.0 0.0 to 210.0

Thermocouple

Input K J T E L U N R S B

Range

C-

200

-

to
1300

F-

300
to
2300

Parameter

■ Characteristics

     

20.0

to

500.0

0.0
to

900.0

-

100
to
850

-

100
to
1500

-

20.0

to

400.0

0.0
to
750

-

200
to
400

-

300
to
700

-

199.9

to

400.0

-

199.9

to

700.0

0
to
600

0
to
1100

-

100
to
850

-

100
to
1500

-

200
to
400

-

300
to
700

-

199.9

to

400.0

-

199.9

to

700.0

-

200
to
1300

-

300
to
2300

0
to
1700

0
to
3000

0
to
1700

0
to
3000

K3MA-LK3MA-L

100
to
1800

300
to
3200

Indication accuracy (at 235C)
(See note.)

Input Thermocouple: K, J, T, E, L, U, N, R, S, B

Measurement method Double integral method
Sampling period 500 ms
Display refresh period Sampling period (sampling times multiplied by number of averaging times if average processing

Max. displayed digits 4 digits (
Display 7-segment digital display, Character height: 14.2 mm
Polarity display “
Zero displa y Leading zeros are not displayed.
Input shift Input shift equivalent to the setting value supported for all points within the sensor measurement

Hold function Max hold (maximum value), Min hold (minimum value)
Hysteresis setting Programmable with front-panel key inputs (0001 to 9999).
Other functions Display color change (green (red), green, red (green), red)

Output Relay contact (SPDT)
Delay in comparative outputs 1 s max.
Enclosure ratings Front panel: NEMA 4X for indoor use (equivalent to IP66)

Memory protection Non-volatile memory (EEPROM) (possible to rewrite 100,000 times)

Thermocouple:
(



0.5% of indication value or 1C, whichever greater) 1 digit max.

Platinum-resistance thermometer:
(



0.5% of indication value or 1C, whichever greater) 1 digit max.

Platinum-resistance thermometer: JPt100, Pt100

is selected.)

-

1999 to 9999)

-

” is displayed automatically with a negative input signal.

range.

Average processing (simple average OFF/2/4/8 operations)
Setting change lockout
Parameter initialization

Rear case: IEC standard IP20
Terminals: IEC standard IP0 0 + finger protection (VDE0106/100)

Note: The indication accuracy of the K thermocouple at a temperature of -200 to 1300C is 2C 1 digit maximum.

The indication accuracy of the T and N thermocouples at a temperature of
The indicator accuracy of the U and L thermocouples at any temperature is
The indication accuracy of the B thermocouple at a temperature of 400
The indication accuracy of the R and S thermocouples at a temperature of 200

-

100C or less is 2C 1 digit maximum.

2C 



C or less is unrestricted.

1 digit maximum.



C or less is 3C 1 digit maximum.

3

K3MA-LK3MA-L

Nomenclature

2. Operation indicators

1

Max

Min

3. Level indicator

4. MAX/MIN key

Name Functions

1. Main indicator Displays current values, parameters, and set values.

2. Opera­tion indi­cators

3. Level indicator Displays the current level that the K3MA-L is in. (See below for details.)

4. MAX/MIN Key Used to display the MAX and MIN values when a measurement value is being displayed.

5. Level Key Used to change the level.

6. Mode Key Used to allow the main indicator to indicate parameters sequentially.

7. Shift Key Used to enable a set value to be changed. When changing a set value, this key is used to move along the digits.

8. Up Key Used to change a set value. Used to set or clear a forced-zero function when a measurement value is being dis-

1 Lit when output 1 is ON.
SV Lit when a set value is being displayed or changed.
Max Lit when the main indicator is showing the MAX value.
Min Lit when the main indicator is showing the MIN value.

played.

SV

MAX/MIN LEVEL SHIFTMODE UP

5. Level key

6. Mode key

7. Shift key

1. Main indicator

8. Up key

Level indicator Level

/

Not lit Operation

2
%

Protect

Adjustment
Initial setting
Advanced-function setting

4

Operation

■ Main Functions

Input Types and Ranges

Parameter Setting Input type Meaning

(-3 




















Platinum-resistance
thermometer

Thermocouple K

Pt100

-

-

0.0 to 100.0C 0.0 to 210.0F

JPt100

-

0.0 to 100.0C 0.0 to 210.0F

-

-

J

-

-

T

-

-

E 0 to 600C 0 to 1100F
L
U

-

-

-

N

-

R 0 to 1700C 0 to 3000F
S 0 to 1700C 0 to 3000F
B 100 to 1800C 300 to 3200F

K3MA-LK3MA-L

200 to 850C

199.9 to 500.0C

199.9 to 500.0C

200 to 1300C

20.0 to 500.0C 0.0 to 900.0F
100 to 850C

20.0 to 400.0C 0.0 to 750.0F
200 to 400C

199.9 to 400.0C

100 to 850C
200 to 400C

199.9 to 400.0C
200 to 1300C

-

300 to 1500F

-

1999 to 900.0F

-

199.9 to 900.0F

-

300 to 2300F

-

100 to 1500F

-

300 to 700F

-

199.9 to 700.0F

-

100 to 1500F

-

300 to 700F

-

199.9 to 700.0F

-

300 to 2300F

Note: The initial value is “

Temperature Unit Selection

Either centigrade (C) or fahrenheit (F) can be selected as the
temperature unit.

Parameter Setting Meaning

#4 "

OUT Types (Comparative Output Models Only)

OUT 1 can be set to operate in one of the three following modes
in accordance with the compared values:

• Upper limit (High Acting):
The output is turned ON when the measurement value is greater
than its set value.

• Lower limit (Low Acting):
The output is turned ON when the measurement value is less



thermocouple K (-200 to 1300C/-300 to 2300F).”

Display in C.

%

Display in F.

• Upper and lower limits (Outside Band Acting):
An upper limit (H set value) and lower limit (L set value) can be
set independently.
The output is turned ON when the measurement value is greater
than the upper-limit set value or less than the lower-limit set val­ue.

Parameter Setting Meaning

.433 '(

Upper limit: Alarm
operates at upper
limit.

+.

Lower limit: Alarm
operates at lower
limit.

'(+.

Upper and lower
limits: Alarm oper­ates at upper and
lower limits.

than its set value.

Upper Limit (High Acting) Lower Limit (Low Acting) Upper and Lower Limits

(Outside Band Acting)

OUT1 value

Measurement
value

Output

ON

OFF

Hysteresis

Measurement
value

OUT1 value

Output

Hysteresis

ON

OFF

OUT1 upper-limit
value
Measurement
value

OUT1 lower-limit
value

Output

Hysteresis

ON

OFF

Hysteresis

5

K3MA-LK3MA-L

Temperature Input Shift

Input shift equivalent to the setting value supported for all points
within the sensor measurement range.

Parameter Setting

(-2 

Temperature

Before shift

to



After shift

Temperature input
shift value

Input

Parameter Initialization

This function returns all of the parameters to their initial values.

Parameter Setting Meaning

(-(3 .%%

.-

--­Initializes all param-

eters.

Use this to reset the K3MA-L after returning it to its factory-set
condition.

Average Processing

Average processing stabilizes displayed values to minimize flicker
by averaging the fluctuating input signals. Average processing
can be performed for the measurement values in either of four
steps (OFF, 2 times, 4 times, or 8 times).

Changing the Display Color

The color of the value displayed can be set to either red or green.
For comparative output models, the display color can be set to
change from green to red, or from red to green, according to the
status of the comparison criterion.

Red

258.9

OUT1 value

Green

192.0

Display Auto-return Time

This function automatically returns the display to the operation
level’s current value if no keys are pressed for a preset time
(called the display auto-return time).

Move-to-Protect-Level Time

The time required to shift to the protect level can be set as
desired.

MAX/MIN Display

The maximum and minimum measurement (display) values from
the time the power is turned ON until the current time can be
stored and displayed. This is useful, for exam ple, when measur­ing the maximum value.

Current value

MAX/MIN LEVEL SHIFTMODE UP

Max

MAX/MIN

MAX value

This is useful for ignoring rapid fluctuations, e.g., eliminating spike
noise.

Hysteresis (Comparative Output Models Only)

The hysteresis of comparative outputs can be set to prevent chat­tering in the output when the measurement value fluctuates finely
near the OUT value.

Upper limit (high acting)

Set value

Measurement value

Output

ON

OFF

Hysteresis

MAX/MIN

LEVEL SHIFTMODE UP

Min

MAX/MIN

LEVEL SHIFTMODE UP

MAX/MIN

MIN value

MAX/MIN

6

■ External Connections

K3MA-LK3MA-L

Terminal Arrangement

Power
supply

Terminal No. Name Description

-

A2

A1

-

E4

E1

E5

E6

-

-

E3

E2

,

Output
terminals

Input
terminals

100- to 240-VAC type or
24-VAC/VDC type

(No polarity for 24-VDC
connection.)

A1

A2

Models with
comparative
output

For thermocouple
input

E1

E2

E3

E4

+

E5

E6

−

For platinum­resistance
thermometer input

E4

E5

E6

Operation power Connec ts the operation power supply.

Thermocouple or platinum-resistance ther­mometer input

Connects the thermocouple or platinum-re­sistance thermometer input.

Outputs Outputs the relay outputs.

A

B

B

7

■ Block Diagram

K3MA-LK3MA-L

Input

Input

Micro­computer

EEPROM

5 V 12 V

Constant voltage circuit

Power supply circuit

Note:Relay output models only.

Key

Display

Output circuit

Contact

X

output (See
note.)

8

K3MA-LK3MA-L

■ Levels

“Level” refers to a grouping of parameters. The following table lists the operations that are possible in each of the levels, and the diagram
tells how to move between levels. There are some parameters that are not displayed for certain models.

Level name Function Measurement

Protect Setting lockouts. Continue
Operation Displaying current values, and setting OUT 1 value. Continue
Adjustment Setting communications writing control. Continue
Initial setting Making initial settings of input type, output operating action, and

other parameters.

Advanced-function setting Setting average processing, display color settings, and other ad-

vanced function parameters.

Power ON

Stopped

Stopped

+

Time set
by user

(See note.)

Protect level

+

1 s min.

Indicates change of level.

Note: The move-to-protect-level time can be set in the advanced-function setting level.

Operation level

1 s min.

1 s min.

Initial setting level

1 s min.

Advanced-function
setting level

- 123.4

Continue to press the key for 2 s min.

Password "−169"

Adjustment level

Less than 1 s

Flashing stops if key
is released.

9

■ Parameters

Note: 1. Some parameters are not displayed for certain models.

K3MA-LK3MA-L

2. The K3MA-L will stop measurement if the level is changed to the initial setting level or
the advanced-function setting level.

3. If the input range is changed, some parameters are set to default values. Therefore,
set the input range first.

4. Settings displayed in reversed colors are initial settings.

Adjustment level

∼∼

0

Press Level Key

for less than 1 s.

Press Level Key

for less than 1 s.

Temperature input shift
For models with the
comparative output function

Set one of these.

Power ON

Operation level

MODE

MODE

MODE

MODE

Current value

OUT1
value

OUT1
upper-limit
value

OUT1
lower-limit
value

∼

∼

∼

10

Press Level
Key for
more than 3 s.

Press Level
Key for
more than 1 s.

Models
with the
compara­tive out­put
function

Initial setting level

MODE

MODE

MODE

MODE

Press Level Key for less than 1 s.

Input type

Temperature
unit

OUT1 type

Move to
advanced­function
setting level

∼ ∼

T e mper a ture unit

∼

OUT1 type

Upper Limit
Lower Limit

Upper/Lower
Limits

∼

Password: -169

Enter
password
"−169"

Models
with the
compar­ative out­put
function

Advanced-function

setting level

MODE

MODE

MODE

MODE

MODE

Parameter
initialization

Average
processing

OUT1
Hysteresis

Display
color
change

Display
auto-return
time

K3MA-LK3MA-L

////

Unit: times

OUT1 hysteresis

∼∼

Green (red)

Green
Red (green)

Red

∼∼

Unit: s

Move-to­protect­level time

∼∼

MODE

Settings displayed in reversed colors are initial settings.

Unit: s

11

Press Level Key + Mode Key for more than 1 s.

K3MA-LK3MA-L

Operation Level

Press Level Key + Mode Key
for more than preset time.

Protect level

MODE

MODE

MODE

Operation/adjustment
lockouts

Setting level lockouts

Setting change lockout

Operation/Adjustment Lockouts

Restricts key operations for operation level and adjustment level.

Param-

. /3 

• Initial setting is 0.

• This cannot be displayed on models not equipped with the com­parative output function.

Setting Operation level Moving to

eter




Process value

display

Allowed Allowed Allowed
Allowed Allowed Prohibited
Allowed Prohibited Prohibited

Set value

display

adjustment

level

/

/

//

/

■

Initial Settings

Power ON

Press the Level Key for 3 s min. to move to the initial setting
level.

Select the input type.

Setting Level Lockouts

Restricts shifting to initial setting level or advanced-function set­ting level.

Parameter Setting Shift to initial

("/3 




setting level

Allowed Allowed
Allowed Prohibited
Prohibited Prohibited

Shift to

advanced-

function

setting level

Setting Change Lockout

Restricts setting changes by key operation. When this lockout is
set, it is no longer possible to shift to a setting change mode.

Parameter Setting Setting change by key

53/3 .%%

.-

However, all protect level parameters can still be changed.

Allowed
Prohibited

operation

If desired, shift to the adjustment level to set the temperature
input shift value.

If required, shift to th e adv anced -functi on setti ng le v el to set the
number of measurements for averaging, hysteresis values,
auto-zero time, display color change, displa y auto-return time ,
or move-to-protect-level time .

Press the Level Key for less than 1 s min. to return to the
operation level.

Set the OUT values.

Measurement starts.

12

■ Setting Example

K3MA-LK3MA-L

Initial Settings

The settings for the following example are shown here.

Example: Monitoring the temperature of an industrial furnace

Industrial furnace

■

Application Examples

Monitoring the temperature of
an industrial furnace

Industrial furnace

E52-PR Thermocouple

K3MA-L

1

Max

Min

SV

MAX/MIN LEVEL SHIFTMODE UP

K3MA-L-C AC100-240V

Sending a temperature alarm
for molding equipment

PID control

Molding equipment

Here, the temperature inside the furnace is to be displayed in cen­tigrade (



C).
Temperature sensor: E52-PR Thermocouple, Measurement
range: 0 to 1,400



C.

1. Set the K3MA-L input type to the thermocouple R input
range.
Parameter:

(-3

(input type), Setting value:



2. Select centigrade (C) as the temperature unit.
Para meter:

#4

(temperature unit), Setting value:

If you are using a comparative output model, make the setting as
desired.

Monitoring the bearing
temperatu re for a generator
motor

E5EN

K3MA-L

Generator motor

Alarm output

K3MA-L

Alarm output

"

• Monitoring the temperature of an indus­trial furnace/sintering furnace.

• Monitoring/alarm function for disinfect­ing equipment.

• Monitoring (failsafe checking) abnormal
temperatures in molding equipment.

• Monitoring the liquid temperature for
cleaning devices.

• Monitoring temperature rises in electric
power generating facilities.

• Inspecting temperatures in machines
and devices.

13

Dimensions

K3MA-LK3MA-L

101.2
91

96

ABCDE

UPSHIFTMODELEVELMAX/MIN

Finger protective
cover (provid ed)

85

97

12

1.3

48

Main indic a tor
character size

14.2 mm

7.6 mm

75 min.

80

44.8

Optional Parts (Order Separately)

Name Shape Model

Splash-proof Soft Cover K32-49SC

Hard Cover K32-49HC

Panel cut-out

120 min.

+0.5

92

0

45

+0.5
0

Installation

1. Insert the K3MA-L into the panel cut-out hole.

2. For a waterproof installation, insert the rubber gasket onto
the body of the K3MA-L.

3. Fit the adaptor into the grooves on the left and right sides of
the rear case, then push it until it contacts the panel to
secure the K3MA-L.

■

Wiring Precautions

• Use crimp terminals.

• Tighten the terminal screws to a torque of approximately 0.5

¼

m.

N

• To avoid the influence of noise, route signal lines and power lines
separately.

■

Wiring

• Use the following M3 crimp terminals.

5.8 mm max.

5.8 mm max.

■

Unit Markings (Provided)

• The unit markings are not attached to the K3MA-L. Select the de­sired markings from the provided sheet.

14

Note: For scales and gauges, use the unit mark ings that are

specified by the relevant laws or regulations.

Precautions

!Caution

Do not touch the terminals while the power is being supplied.
Doing so may result in electric shock.

!Caution

Do not disassemble the product or touch the internal compo­nents of the product while the power is being supplied. Doing
so may result in electric shock.

!Caution

Do not allow pieces of metal or wire clippings to enter the prod­uct. Doing so may result in electric shock, fire, or malfunction.

!Caution

Perform correct settings for the product according to the control
application. Failure to do so may cause unexpected operation,
resulting in damage to the product or injury.

!Caution

Take safety measures, such as installing a separate monitoring
system, to ensure safety even if the product fails. Product fail­ure may prevent comparative outputs from being generated,
resulting in serious accidents.

Observe the following precautions to ensure safety.

1. Maintain the power supply voltage within the range speci­fied in the specifications.

2. Maintain the load within the rat ings specified in the specifi­cations.

3. Check each terminal for correct number and polarity before
connecting it. Incorrect or reverse connections may dam­age or burn out internal components in the product.

4. Tighten the terminal screws securely. The recommended
tightening torque is 0.43 to 0.58 N
cause fire or malfunction.

5. Do not connect anything to unused terminals.

6. Provide a switch or circuit breaker so that operators can
easily turn OFF the power supply when necessary. Also
provide appropriate indications of such devices.

7. Do not attempt to disassemble, repair, or modify the prod­uct.

8. Do not use the product where flammable or combustible
gases are present.

Application

General Precautions

1. Do not use the product in the following locations:

• Locations subject to direct radiant heat from heating

equipment.

• Locations subject to exposure to water, oil, or chemicals.

• Locations subject to direct sunlight.

• Locations subject to dust or corrosive gases (particularly,

sulfuric gas or ammonia gas).

• Locations subject to severe changes in temperature.

• Locations subject to icing or condensation.

• Locations subject to shock or vibration.

2. Do not block heat dissipation around the product, i.e., pro­vide sufficient space for heat dissipation.

3. Ensure that the rated voltage is reached within two seconds
after the power is turned ON.

4. Conduct aging for 15 minutes min. after power is turned ON
for correct measurement.

¼m. Loose screws may

K3MA-LK3MA-L

5. Do not touch the slit sections or terminals while the power
is being supplied to prevent the product from being affected
by static electricity.

6. Do not lay heavy objects on the product during use or stor­age. Doing so may deform or deteriorate the product.

7. Do not use paint thinner for cleaning. Use commercially
available alcohol.

Mounting

• Mount the product to a panel that is 1 to 8 mm thick.

• Install the product in a horizontal position.

• Use crimp terminals that match screw sizes.

Noise Prevention

• Install the product as far as possible from devices that generat e
strong, high-frequency fields (such as high-frequency welders or
sewing machines) or surges.

• Install surge absorbers or noise filters on nearby devices that
generate noise (particularly motors, transformers, solenoids,
magnet coils, and other devices that have a high inductance
component). Do not connect a surge absorber to the tempera­ture sensor input section of the K3MA-L.

Line filter

Power

Tempera-

supply

ture Meter

input

• To prevent inductive noise, separate the terminal block wiring for
the product from high-voltage or high-current power lines. Do not
route the wiring for the product in parallel with or tie it in a bundle
with power lines.
Take the following countermeasures against inductive noise in
input lines.

Temperature Inputs

Separate the lead w ire that connects the product w ith a temperature
sensor from the load line to pre vent the pr oduct fr om bei ng affect ed by
inductive noise.

• When using a noise filter for the power supply, check for the volt­age and current and install it as close as possible to the Temper­ature Meter.

• Do not install the product near radios, television sets, or wireless
devices. Doing so may cause reception interference.

Increasing Service Life

• Do not use the product in locations where the temperature or hu­midity exceeds the ratings or where condensation may occur.
When installing the product in a panel, be sure that the temper­ature around the product (not the temperature around the panel)
does not exceed the ratings. The product service life depends on
the ambient temperature. The higher the ambient temperature,
the shorter the service life. To extend the product service life,
lower the temperature inside the Temperature Meter.

• Use and store the product within the temperature and humidity
ranges given in the specifications. When gang-mounting Tem­perature Meters or arranging them vertically, heat generated by
the Temperature Meters will cause the internal temperature to
rise, reducing the service life. In such cases, consider fo rced
cooling methods, such as using a fan to circu late a ir around the
Temperature Meters. Do not, however, allow only the t erminals
to be cooled. Doing so will increase measurement error.

• The life of the output relays are greatly affected by the switching
capacity and switching conditions. Use these relays within their
rated load and electrical life. The contacts may fuse or burn if
they are used past their electrical life.

+

Tempera­ture Meter

Signal
input

−

Surge absorber

Power
supply
input

15

K3MA-LK3MA-L

■ Troubleshooting

When an error occurs, error details will be displayed on the main indicator. Conf irm the error from the main indicator and take the appropri­ate countermeasures.

Level display Main indicator Error contents Countermeasures

Not lit

$

Not lit Flashes

Not lit Flashes

Not lit Flashes

$

2$11





RAM memory error Repair is necessary.

Consult your OMRON sales rep­resentative.

EEPROM memory error When this error is displayed,

Input error Confirm that the temperature

The measurement value after
temperature input correction ex­ceeds 9999.

The measurement value after
temperature input correction is
lower than -1999.

press the Level Key for 3 sec­onds, and the settings will be re­stored to the factory settings.

If the error cannot be recovered,
repair is necessary.

Consult your OMRON sales rep­resentative.

sensor is correctly connected,
and that there are no broken sig­nal lines to the temperature sen­sor.

If the condition does not return to
normal, repair is necessary.

Consult your OMRON sales rep­resentative.

The temperature input correction
value may be inappropriate.

Use the adjustment level to re­view the temperature input cor­rection value.

The temperature input correction
value may be inappropriate.

Use the adjustment level to re­view the temperature input cor­rection value.

ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.

To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.

Cat. No. N109-E1-01

In the interest of product improvement, specifications are subject to change without notic e.

OMRON Corporation

Industrial Automation Company
Measuring and Supervisory Controls Department

Shiokoji Horikawa, Shimogyo-ku
Kyoto, 600-8530 Japan
Tel: [phone]/Fax: [phone]

16

Printed in Japan
1001-1M (1001) (B)