INSTRUCTIONS FOR ISOLATED SAFETY BARRIER NPEXA-C1

This type of Isolated Safety Barrier transmits thermocouple signals from hazardous area to safe area by isolating transmitting current or voltage signals in a circuit or two isolated circuits, the input, output, and power supply are galvanically isolated from each other. Besides, it may also be connected in a connection network in safe area via communication ports. It is an intelligent product with online self-diagnosis function. Customer may set the type and the range of the input or output signals with a handheld programmer we provide.

Dielectric strength:

≥2500V AC (Input/Output/Power supply, 1 mA leakage current, 1 minute test time)

Insulation coordination:

≥100MΩ (Input/Output/Power supply)

Electromagnetic compatibility: IEC 61000-4

Power supply:

18~32V DC (Recommended voltage:24V DC)

Power consumption:

0.5W (24V power supply, 20mA single output)

0.7W (24V power supply, 20mA double output)

Mainly Technical Parameters:

Explosive-proof grade: [Ex ia]ⅡC

Permissible input signal from hazardous area:

Thermo-couple:K, E, S, B, J, T, R, N

Signal type and range can be specified at your order and may also be programmed by user.

Output signal to safe area:

DC current:0~10 mA, 4~20 mA, 0~20 mA

DC voltage:0~5 V, 1~5 V, 0~10 V

Signal type and range can be specified at your order and may also be programmed by user.

Transmitting accuracy(at 25℃±2℃, without temperature compensation):

TC type	Measurable range	Accuracy
K/E/J/N etc.	< 300 ℃	±0.3 ℃
K/E/J/N etc.	≥ 300℃	±0.1% F∙S
S/B/T/R/WRe-series	< 500 ℃	±0.5 ℃
S/B/T/R/WRe-series	≥ 500 ℃	±0.1% F∙S

Influence of ambient temperature: < 30 ppm/℃

Rise time: ≤ 2 s (bounce from 10%~90%)

Output load capacity:

DC current:0~10mA: 0~700 Ω;4~20mA: 0~350 Ω

DC voltage: 0(1) ~ 5V: ≥ 1 MΩ; 0~10V: ≥ 2M Ω

Cold junction compensation range:-20℃~+60℃

Cold junction compensation accuracy:

±1℃ (Preheated for 10 minutes).

Parameters certified by China National Quality Supervision and Test Centre for Explosion Protected Electrical Products (CQST):

Um =250VAC/DC

Between terminal 1 & 2, 4 & 5:

U_o=6.5 V, I_o=9.7 mA, P_o=15.8 mW

ⅡC: C_o=17.5 μF, L_o=264 mH

ⅡB: C_o=399 μF, Lo=792 mH

ⅡA: C_o=700 μF, L_o=1000 mH

Model Indication:

Model					Note
NPEXA-C1	╳	╳	╳	╳	Thermo-couple input isolated safety barrier
Input loop					Single loop as default
Input loop	D				Double loop
1^st output		1			4~20mA
		2			1~5V
		3			0~10mA
		4			0~5V
		5			0~10V
		6			0~20mA
2^nd output					None as default
			1		4~20mA
			2		1~5V
			3		0~10mA
			4		0~5V
			5		0~10V
			6		0~20mA
Communication OR Alarm function (not coexists with 2^ndoutput)					None as default
				T1	485 communication (single output only)
				T2	232 communication (single output only)
				A1	Single relay alarm output
				A2	Double relay alarm output

Note:

Thermocouple input type and the corresponding output range need to be specified when placing order. If you needs to program by yourself, please operate with computer or a handheld programmer.