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Process Meter


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


Model K3MA-J 100-240VAC,
K3MA-J-A2 100-240VAC
Supply voltage 100 to 240 VAC 24 VAC/VDC
Operating voltage range 85% to 110% of the rated supply voltage
Power consumption
(under maximum load)
6 VA max. 4.5 VA max. (24 VAC)
4.5 W max. (24 VDC)
Insulation resistance 20 MΩ min. (at 500 VDC) between external terminal and case.
Insulation provided between inputs, outputs, and power supply.
Dielectric strength 2,000 VAC for 1 min between external terminal and case.
Insulation provided between inputs, outputs, and power supply.
Noise immunity ±1,500 V on power supply terminals in normal or common mode.
±1 μs, or 100 ns for square-wave noise with 1 ns.
±480 V on power supply terminals in normal mode.
±1,500 V in common mode.
±1 μs, or 100 ns for square-wave noise with 1 ns.
Vibration resistance Vibration: 10 to 55 Hz, Acceleration: 50 m/s2
5 min each in X, Y, and Z directions for 10 sweeps.
Shock resistance 150 m/s2 (100 m/s2 for relay contact outputs) 3 times each on 3 axes, 6 directions.
Ambient temperature Operating: -10°C to 55°C (with no condensation or icing)
Storage: -25°C to 65°C (with no condensation or icing)
Ambient humidity Operating: 25% to 85% (with no condensation)
Approved safety standards UL61010-1, CSA C22.2 No.61010-1-04, conforms to EN61010-1 (Pollution degree 2/overvoltage category II)
Conforms to VDE0106/P100 (finger protection)
EMC (EMI) EN61326-1 Industrial electromagnetic environment
Emission Enclosure: CISPR 11 Group 1 class A: CISRP16-1/-2
Emission AC Mains: CISPR 11 Group 1 class A: CISRP16-1/-2
(EMS) EN61326-1 Industrial electromagnetic environment
Immunity ESD: EN61000-4-2: 4 kV contact discharge, 8 kV air 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), 2 kV line to ground (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% (rated voltage)
Weight Approx. 200 g


Input signal DC voltage/current (0 to 20 mA, 4 to 20 mA, 0 to 5 V, 1 to 5 V, ±5 V, ±10 V)
A/D conversion Double integral method
Input impedance Current input: Approx. 45Ω, Voltage input: 1MΩ min.
Sampling period 250 ms
Display refresh period Sampling period (sampling times multiplied by number of measurements for averaging if
average processing is selected.)
Max. displayed digits 5 digits (-19999 to 99999)
Display 7-segment digital display, Character height: 14.2 mm
Polarity display "-" is displayed automatically with a negative input signal.
Zero display Leading zeros are not displayed.
Scaling function Programmable with front-panel key inputs (range of display: -19999 to 99999).
The decimal point position can be set as desired.
Hold function Max. hold (maximum value), Min. hold (minimum value)
Hysteresis setting Programmable with front-panel key inputs (0001 to 9999).
Other functions Forced-zero (with front-panel key)
Scaling teach function
Display color change (green (red), green, red (green), red)
OUT type change (upper limit, lower limit, upper/lower limit)
Average processing (simple average)
Output Relays: 2 SPST-NO
Delay in comparative outputs 750 ms max.
Degree of protection Front panel: NEMA4X for indoor use (equivalent to IP66)
Rear case: IEC standard IP20
Terminals: IEC standard IP00 + finger protection (VDE0106/100)
Memory protection Non-volatile memory (EEPROM) (possible to rewrite 100,000 times)
(with terminal cover attached)

Measuring Ranges

Process Voltage/Current Inputs

Input Measuring range Measuring accuracy Input impedance Displayable range
DC voltage 1.000 to 5.000 V ±0.1% FS ±1 digit max.
(at 23±3°C)
1 MΩ min. -19999 to 99999
(with scaling function)
0.000 to 5.000 V
-5.000 to 5.000 V ±0.1% FS ±1 digit max.
(at 23±5°C)
-10.00 to 10.00 V
DC current 4.00 to 20.00 mA/ ±0.1% FS ±1 digit max.
(at 23±3°C)
45 Ω
0.00 to 20.00 mA

Input/Output Ratings

Relay Contact Output

Item Resistive load (cosφ = 1) Inductive load (cosφ = 0.4, L/R=7 ms)
Rated load (UL ratings) 5 A at 250 VAC, 5 A at 30 VDC 1.5 A at 250 VAC, 1.5 A at 30 VDC
Min. permissible load
(P level, reference value)
10 mA at 5 VDC
Mechanical life 5,000,000 times min.
Electrical life 100,000 times min.