MODEL: M3LT

M3LT SPECIFICATIONS

ES-2661 Rev.13 Page 2/4

http://www.m-system.co.jp/

connected to th front jack.

Programmable features include:

• I/O type and range

• Zero and span adjustments

• Burnout action

• User’s T/C table setting

(max. 300 points, input emf specified within

-100 – +1000 mV)

• Others

(Refer to the instruction manual)

‘One-Step Cal’ calibration: With I/O type and the full-scale

range configured via the internal DIP switches, precise 0 %

and 100 % ranges are calibrated via the front control

buttons with a help of LED. Also I/O calibration and fine

adjustment are available with a PC.

Configurator connection: 2.5 dia. miniature jack;

RS-232-C level

INPUT SPECIFICATIONS

■ Thermocouple: See table 1

Input resistance: ≥ 1 MΩ

Burnout sensing: 130 nA ± 10 %

Temperature range: See Table 1.

OUTPUT SPECIFICATIONS

■ DC Current

Maximum range: 0 – 20 mA DC

Minimum span: 1 mA

Conformance range: 0 – 24 mA DC

(Negative overrange current below 0 mA is not available.)

Offset: Lower range can be any specific value within the

output range provided that the minimum span is

maintained.

Load resistance: Output drive 12 V maximum

■ DC Voltage

Narrow Spans

Maximum range: -2.5 – +2.5 V DC

Minimum span: 250 mV

Conformance range: -3 – +3 V DC

Wide Spans

Maximum range: -10 – +10 V DC

Minimum span: 1 V

Conformance range: -11.5 – +11.5 V DC

Offset: Lower range can be any specific value within the

output range provided that the minimum span is

maintained.

Load resistance: Output drive 1 mA maximum

INSTALLATION

Power consumption

•DC: Approx. 3 W

Operating temperature: -25 to +65°C (-13 to +149°F)

Max. 55°C (131°F) for UL approval

Operating humidity: 0 to 95 %RH (non-condensing)

Mounting: DIN rail

Weight: 100 g (0.22 lb)

PERFORMANCE

Accuracy: See Table 1 and refer to calculation examples of

overall accuracy.

Cold junction compensation error:

±0.5°C at 25 ±10°C

±0.9°F at 77 ±18°F

Temp. coefficient: ±0.015 %/°C (±0.008 %/°F) of max. span

at -5 to +55°C [23 to 131°F]

Response time: ≤ 0.9 sec. (0 – 90 %)

Burnout response: ≤ 10 sec.

Line voltage effect: ±0.1 % over voltage range

Insulation resistance: ≥ 100 MΩ with 500 V DC

Dielectric strength: 1500 V AC @ 1 minute

(input to output or power to ground)

500 V AC @ 1 minute (output to power)

CALCULATION EXAMPLES OF OVERALL ACCURACY

[Example 1]

Input: K thermocouple, 0 – 1000°C, Output: 4 – 20 mA DC

1) Absolute value accuracy (Table 1): 0.25°C

2) CJC error (0.5°C) added: 0.75°C

3) 0.75°C ÷ 1000°C × 100 = 0.075 %

4) 0.075 % < 0.1 % of span. ➠ 0.1 % is selected.

5) Output span 16 mA (= 20 mA – 4 mA)

Max. span 20 mA

Output span ≥ 1/10 of max. span ➠ No need of adding

0.2 %.

6) Overall accuracy equals ±0.1 % of span

[Example 2]

Input: K thermocouple, 50 – 150°C, Output: 2.0 – 2.5 V DC

1) Absolute value accuracy (Table 1): 0.25°C

2) CJC error (0.5°C) added: 0.75°C

3) 0.75°C ÷ (150 – 50)°C × 100 = 0.75 %

4) 0.75 %> 0.1 % of span. ➠ 0.75 % is selected.

5) Output span 0.5 V (= 2.5 V – 2.0 V)

Max. span 5 V

Output span ≤ 1/10 of max. span ➠ Add 0.2 %.

6) Overall accuracy equals ±0.95 % of span (0.75 + 0.2)