Digital Meter / Printer

Digital SW Setting Type Thermocouple / RTD Temperature Meter

MODEL 4258A

■ Analog output, BCD output are available.
■ Scaling can be set with easy operation.
■ Alarm setting can be set with Digital Switch.
■ 7 types of Thermocouple(TC) and RTD are applicable.

Model Designation

4258A	-	□	-	□	-	□	-	□
		①		②		③		④

① Power supply

Code	Function
A	AC 100 to 240 V
B	DC 12 to 24 V

②Data output

Code	Specification	Allowable Load Resistance
X	No output	-
05A	Analog output DC 0 to 10 V	More than 2 kΩ
09A	Analog output DC 1 to 5 V	More than 2 kΩ
29A	Analog output DC 4 to 20 mA	0 to 500 Ω
BP	BCD output (TTL level positive logic)	-
BN	BCD output (TTL level negative logic)	-
DN	BCD output (transistor output, sink type)	-

③Comparison output

Code	Specification
RY	Relay contact output
TN	Open collector output (NPN)

④Display color

Code	Specification
R	Red LED
G	Green LED

Measuring Input

Thermocouple

Sensor	Measuring range	Display range	Accuracy*
R	0 to 1600°C	-50 to 1800°C	±(0.3% of rdg. + 1°C)
K	-200 to 1200°C	-270 to 1400°C
E	-200 to 900°C	-270 to 1050°C
J	-40 to 750°C	-210 to 1250°C
T	-200 to 350°C	-270 to 420°C
B	600 to 1700°C	-20 to 1820°C
N	-40 to 1200°C	-230 to 1350°C

* Accuracy:: Specified at measurement range
Defined at 23°C ± 5°C, 45 to 75% RH
Temperature coefficient:: ± 300 ppm/°C, defined at the operating temperature range of 0 to 50°C
Reference junction compensation:: ± 1 °C for operating temperature range 0 to 50 °C

Calibrated according to JIS C-1602-2015 standard thermoelectric power mV input

RTD input

Sensor	Measuring range	Display range	Accuracy*
Pt100Ω	-200 to 850°C	-200 to 870°C	±(0.2% of rdg. + 0.3digit)
JPt100Ω	-200 to 600°C	-200 to 650°C	±(0.2% of rdg. + 0.3digit)

* Accuracy:: Specified at measurement range
Defined at 23°C ± 5°C, 45 to 75% RH
Temperature coefficient:: ± 200 ppm/°C, defined at the operating temperature range of 0 to 50°C

Calibrated according to JIS C-1604-2013 standard resistance element resistance values

Basic Specifications

Display	Red or green LED (character height 15mm), " - " is displayed during nagative polarity input, Zero suppression function is equipped. Either of one, 'current value', 'peak memory', 'bottom memory' or amplitude width can be displayed.
Temperature sensors	A sensor from 9 types can be used.
Over-range display	Flasing with min. or max. value of display range.
Direction of burnout	Flashes with max. value of display range. For RTD, flasing with min. value of display range.
Resolution	Thermocouple input: 1 °C, RTD input: 0.1 °C
External resistance	Thermocouple input: Less than 500Ω RTD input: Lead wire line less than 5Ω per line
Excessive input	DC ± 2.5 V
Sampling cycle	Approx. 5 times/s.
Display cycle	Selectable from 200ms, 400ms, 1s, 2s, 4s or 5s
Input configuration	Single-ended, floating input
A/D conversion	Δ-∑conversion system
Noise reduction rate	Normal mode (NMR) - More than 50 dB. Common mode (CMR) - More than 110 dB. Power line mixed noise – AC power 1000 V
Comparative digit	Numbers: 4 digit, Polarity: 1 digit
Input response	Either of longer from less than 2 samplings or 1 display cycle.
Number of Comparator	Digital 4 points, Analog 1 point
Comparative method	Independent settings for 2 comparison points, upper/lower limits can be arbitrarily set. Comparison judgment by CPU (comparison against displayed value) Judgment function of 'equal GO' or 'equal NG' is switchable.
Judgement setting	Set with digital switches
Hysteresis width	Set from the range of 1 to 999 (independent setting for 2 points)
Comparison display	LED display, HI(red), GO(green), and LO(yellow)
Comparison output	Relay Contact Output HI, GO, LO: 1a contact Contact capacity: AC 125 V 0.5 A (resistive load) DC 30 V 1 A (resistive load) Open Collector Output (NPN) HI, GO, LO Output rating: DC 30 V 30 mA(Max) Output saturation voltage: DC 1.6 V or less
Power on delay	Set from 2 to 99 seconds from front switch with 1-second steps arbitrarily.
Output delay	ON delay Set from 0 to 60 seconds from front switch with 1-second steps arbitrarily. Independent settings for 2 comparison points
Hold	Measured data, Comparison data and output data are retained.
Reset	Alarm outputs can be reset. (all alarms become off.)
Insulation Resistance	DC 500 V 100 MΩ or more
Withstand Voltage	Between input terminal and outer case: AC 1500 V 1minute. Between power supply terminal and Outer case: AC 1500 V 1minute. Between power supply terminal and output terminal: AC 500 V 1minute.
Power Supply	AC 100 to 240 V (50/60Hz), DC 12 to 24 V
Power supply voltage tolerance	AC 90 to 250 V DC 10.8 to 32 V
Power Consumption	AC 100 V approx. 5 VA, AC 200 V approx. 7 VA, DC 12 V approx. 200 mA, DC 24 V approx. 100 mA
Operating ambient temperature	0 to 50°C
Storage Temperature	-20 to 70°C
Weight	Approx. 450 g