详细说明 标准信号隔离放大器 VariTrans® A 21000   knick

Ideal for high demands The A 21000 isolates, transmits and converts 0 ... 20 / 4 ... 20 mA and 0 ... 10 V standard signals with a high level of accuracy. In spite of its modular housing being only 6 mm wide, the new VariTrans® isolation amplifier provides maximum protection of personnel and equipment by protective separation up to a working voltage of 300 V conforming to EN 61140. Test voltage is 2.5 kV AC. Very small coupling capacitances ensure that high transient common-mode interferences can be reliably isolated and cannot lead to system malfunctions. Worldwide application Maximum flexibility is provided by the integrated broad-range power supply for 24 … 110 V DC / 110 … 230 V AC. This ensures trouble-free operation with alternating or direct voltages everywhere in the world even in unstable power supply networks. Erroneous connection of mains supply is practically impossible. Expensive standstill times and repair work during the commissioning are prevented. Calibrated range selection VariTrans® A 21000 sets the measuring ranges via DIP switches – comfortably and unmistakably. Calibrated range selection ensures a gain accuracy of 0.2 (0.3) %. Tedious on-site adjustment using a screwdriver, calibrator or multimeter is therefore no longer required – it couldn't be safer or easier! Universal usability The 3-port isolation offers diverse application possibilities. The input and output circuits can be applied to any potentials, taking account of the permitted working voltages. The distinction between input and output isolation amplifier is not required with the VariTrans® A 21000 because all 3 electric circuits are galvanically isolated from each other. Ideal for SPC applications In developing the VariTrans® A 21000 standard-signal isolation amplifier, the requirements of EN 61131-2 “Programmable Controllers” were consistently taken into account. Although isolation amplifiers are predominantly used for DC current signals, the correct transmission of fast signal changes cannot be dispensed with. Excellent large-signal characteristics guarantee a correct run into the overrange limit. Dead times, hysteresis, signal reversal or latch-up effects are prevented – an indispensable feature for further processing in the SPC. Long-term reliability Knick has achieved a significant increase in reliability and service life through the development of isolation amplifiers with extremely low power consumption. The resulting minimum self-heating of the devices together with their only 6-mm-wide modular housing allows high component density in the enclosure. The benefit for reliability is reflected in an MTBF (mean time between failures) of 280 years.

Application examples

Facts:
Broad-range power supply 24 to 110 V DC / 110 to 230 V AC 3-port isolation; prevention of incorrect measurements caused by potential differences Protective separation up to 300 V AC/DC according to EN 61140 High isolation
	- 2.5 kV AC test voltage
Long service life; extremely low failure rate due to reduced self-heating Cost savings with smaller control cabinets; closely packed mounting of the ultra-compact housings allows more channels per meter DIN rail High accuracy and temperature stability: gain error 0.2 % and
temperature coefficient 0.01 %/K
Calibrated range selection without complicated adjustments Simple configuration by DIL switches; accessible from outside UL approval for North America Adjustable or fixed-range models Best price/performance ratio 5-year warranty

Product line
Devices	Input	Output	Order no.
VariTrans® A 21000 with calibrated	0 ... 20 mA,	0 ... 20 mA,	A 21000 P0
input and output selection	4 ... 20 mA,	4 ... 20 mA,
	0 ... 10 V	0 ... 10 V
VariTrans® A 21000 with	0 ... 20 mA	0 ... 20 mA	A 21016 P0
fixed settings	0 ... 20 mA	4 ... 20 mA	A 21017 P0
	0 ... 20 mA	0 ... 10 V	A 21018 P0
	4 ... 20 mA	0 ... 20 mA	A 21026 P0
	4 ... 20 mA	4 ... 20 mA	A 21016 P0
	4 ... 20 mA	0 ... 10 V	A 21028 P0
	0 ... 10 V	0 ... 20 mA	A 21036 P0
	0 ... 10 V	4 ... 20 mA	A 21037 P0
	0 ... 10 V	0 ... 10 V	A 21038 P0

Dimension drawings and terminal assignments

Schematic diagram

Specifications
Input data
Inputs	0 ... 20 mA
	4 ... 20 mA
	0 ... 10 V	switchable (factory setting 0 ... 20 mA)
Input resistance	Current input:	Voltage drop < 0.1 V at 20 mA
	Voltage input:	Approx. 100 kohms
Overload capacity	Current input:	<100 mA
	Voltage input:	Voltage limited to 30 V by suppressor diode,
		max. permissible continuous current: 3 mA
Output data
Outputs	0 ... 20 mA
	4 ... 20 mA
	0 ... 10 V	switchable (factory setting 0 ... 20 mA)
Load	With output current:	≤ 10 V (≤ 500 ohms at 20 mA)
	With output voltage:	≤1 mA (≥ 10 kohms at 10 V)
Offset	< 20 µA or < 10 mV
Residual ripple	<10 mVrms
Transmission behavior
Gain error	< 0.2 % of measured value with direct 1:1 current transmission
	< 0.3 % of measured value with voltage input and/or voltage output
	Additional error in live-zero operation 20 µA or 10 mV
Temp influence	< 0.01 %/K full scale (reference temp. 23 °C)
	Average TC in specified operating temperature range 0 ... +55 °C
Cutoff frequency	>100 Hz, –3 dB
Power supply
Power supply	24 V ... 110 V DC (±25%), approx. 1.0 W
	110 V ... 230 V AC (± 10%), approx. 2.0 VA
Isolation
Test voltage	2.5 kV AC, 50 Hz
Working voltage	Up to 300 V AC/DC across input and output / power supply, for overvoltage category II
(basic insulation)	and pollution degree 2, up to 100 V AC/DC across output and
	power supply for category II and degree 2 according to EN 61010 Part 1.
Protection against	Protective separation according to EN 61140 by reinforced insulation according to EN 61010
electric shock	Part 1 up to 300 V with overvoltage category II and pollution degree 2 across
	input and output/power supply.
	For applications with high working voltages, you should ensure there is sufficient spacing or
	isolation from neighboring devices and protection against electric shocks.
Standards and approvals
EMC	Product family standard:	EN 61326
	Emitted interference:	Class B
	Immunity to interference:	Industry
	Slight deviations are possible during interference
Approval	cULus Listed,
(pending)	Standard: UL 61010-1 and CSA C22.2 No. 61010-1
Other data
MTBF	Approx. 280 years
	Mean Time Between Failures – MTBF – according to EN 61709 (SN 29500)
	Conditions: stationary operation in well-kept rooms,
	average ambient temperature 40 ºC, no ventilation, continuous operation
Ambient temperature	during operation:	0 ... +55 ºC
	during storage:	–40 ... +85 ºC
Design	Modular housing with screw terminals, width 6.1 mm
	see dimension drawings for further dimensions
Ingress protection	IP 20
Mounting	For 35-mm top-hat rail (EN 60715)
Weight	Approx. 50 g