WAGO 750-481/040-000: 2-Channel Analog Input for Resistance Measurement
Intrinsically Safe Module for Hazardous Areas
The WAGO-I/O-SYSTEM 750 XTR 2-Channel Analog Input module (Item No. 750-481/040-000) is designed for direct connection to Pt and Ni resistance sensors or potentiometers located in hazardous areas, specifically Zones 0 and 1. The module itself must be installed in Zone 2 or a non-hazardous area. The 24 V supply is provided via the module's power jumper contacts, and the shield is directly connected to the DIN-rail.
Key Features and Indicators:
- Indicators: Green LED (availability ON/OFF), Red LED (short circuit, wire breakage, measurement range overflow/underflow).
- Electrical Isolation: Field and system levels are electrically isolated.
- Harsh Environment Operation: Ideal for harsh environments due to an extended temperature range, greater immunity to impulse voltages and electromagnetic interference, and higher vibration and shock resistance.
Product Information:
| Description | Item No. | Pack. Unit |
|---|---|---|
| 2AI RTD Ex i XTR | 750-481/040-000 | 1 |
Accessories:
| Description | Item No. | Pack. Unit |
|---|---|---|
| Mini-WSB Quick Marking System, plain | 248-501 | 50 |
Technical Data:
| Technical Data | Details |
|---|---|
| Number of analog inputs | 2 |
| Signal type | Resistance thermometers: Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni1000; Resistors: 1.2 kΩ, 5 kΩ; Potentiometer setting: 0…100 % (1.2 kΩ, 5 kΩ) |
| Sensor connection | 2-conductor; 3-conductor |
| Temperature range | -200…+850 °C (Pt), -60…+250 °C (Ni), -80…+320 °C (Ni 120) |
| Resolution | 0.1 °C; 0.1 Ω; 0.0049 % |
| Conversion time | 150…500 ms (per channel) |
| Measurement/output error (25 °C) | < ±0.2 % of the largest measurement/output area |
| Temperature coefficient | < ±0.01 %/K of the largest measurement/output area |
| Measured current (typ.) | < 0.5 mA |
| Supply voltage (field) | 24 VDC via power jumper contacts (Ex i XTR power supply: UQ = max. 26.8 V) |
| Current consumption (field supply) | 12 mA |
| Current consumption (system supply) | 25 mA |
| Power consumption Pmax | 0.45 W |
| Power loss PL | 0.45 W |
| Data width (internal) | 2 x 16-bit data; 2 x 8-bit control/status (optional) |
| Isolation Rated surge voltage | Um=300 VAC system/supply; 1 kV; Rated surge voltage between intrinsically safe and non-intrinsically safe circuits: 1.5 kV (EN 60079-11) |
| Connection technology | CAGE CLAMP* |
| Conductor range | 0.25…2.5 mm² / 24…14 AWG |
| Strip length | 8…9 mm / 0.33 inch |
| Dimensions W x H x D | 24 x 67.8 x 100 mm |
| Weight | 91.6 g |
| Ambient temperature (operation) | -40…+70 °C |
| Ambient temperature (storage) | -40…+85 °C |
| Relative humidity | Max. 95 %, short-term condensation per Class 3K7 / IEC EN 60721-3-3 and E DIN 40046-721-3 (except wind-driven precipitation, water and ice formation) |
| Operating altitude | Without temperature derating: 0…2000 m; With temperature derating: 2000…5000 m (0.5 K/100 m); Maximum: 5000 m |
| Vibration resistance | Per IEC 60068-2-6 (acceleration: 5 g), EN 60870-2-2, IEC 60721-3-1, -3 |
| Shock resistance | Per IEC 60068-2-27 (15 g/11 ms/half-sine/1,000 shocks; 25 g/6 ms/1,000 shocks), EN 61373 |
| EMC immunity to interference | EN 61000-6-1, EN 61000-6-2, EN 61131-2 (marine applications), EN 60255-26, EN 60870-2-1, EN 61850-3, IEC 61000-6-5, IEEE 1613, VDEW: 1994 |
| EMC emission of interference | EN 61000-6-3 and EN 61000-6-4, EN 61131-2, EN 60255-26 (marine applications), EN 60870-2-1 and EN 61850-3 (industrial and residential areas) |
Explosion Protection:
Safety-relevant data (circuit):
- Intrinsic Safety Parameters: Uo = 7.2 V; Io = 5.8 mA; Po = 10.5 mW; Linear characteristic curve
- Reactances (Ex ia IIC): Lo = 100 mH; Co = 13.5 µF
- Reactances (Ex ia IIB): Lo = 100 mH; Co = 240 µF
- Reactances (Ex ia I): Lo = 100 mH; Co = 1000 µF
- Note: Reactances are without considering the concurrence of L and C. For concurrences, refer to the manual.
Guidelines and Approvals:
- Conformity marking: €€
- Ex guideline: EN/IEC 60079-0, -7, -11
- Marine applications: ABS, DNV GL, LR, PRS
- Ordinary Locations: UL E175199
- Hazardous Locations Approvals:
- TÜV 17 ATEX 196484 X: € II 3 (1) G Ex ec [ia Ga] IIC T4 Gc; € II (1) D [Ex ia Da] IIIC; € I (M1) [Ex ia Ma] I
- IECEx TUN 17.0005X: Ex ec [ia Ga] IIC T4 Gc; [Ex ia Da] IIIC; [Ex ia Ma] I
- UL E198726 Hazardous Locations: CI I, Div 2, Group A, B, C, D, T4
Wiring Diagram and Circuitry:
The module features connections for +R1/+R2, 24 V, RL1/RL2 (0 V), -R1/-R2, and Shield. The internal circuitry includes multiplexers, analog-to-digital converters, and logic for error functions, with protection against interference indicated by capacitance values (e.g., 330 pF, 10 nF, 4.7 nF) in the schematic.
Note: The analog output module must only be operated via a 24 VDC Ex i XTR power supply (750-606/040-000). General information on explosion protection is available in the WAGO-I/O-SYSTEM 750 XTR manuals.
