Product Description
📘 Product Overview
| Field | Details |
|---|---|
| Manufacturer | Invensys (Foxboro, now Schneider Electric) |
| Model Number | 873RS-AIYFNZ-7 |
| Product Type | Electrochemical Analyzer for Resistivity Measurements |
| Function | Measures resistivity of aqueous solutions with automatic temperature compensation |
| System Compatibility | Compatible with 871CC sensors (0.1 cm⁻¹ cell factor); supports single or dual sensor setups |
| Included Components | Analyzer unit, optional rear cover (BS805QK for plastic enclosure) |
⚙️ Hardware Specifications
| Feature | Specification |
|---|---|
| Enclosure Type | Metal (NEMA 4X, CSA Enclosure 4X, IP-65), movable surface mount (Z option) |
| Dimensions | 92(H) × 92(W) × 259(L) mm (3.6 × 3.6 × 10.1 in) |
| Weight | 3.13 kg (6.9 lb) for movable surface mount |
| Display | Four-digit red LED (14.2 mm height), visible up to 6 m (20 ft) |
| Keypad | 8 keys (6 dual-function); includes Shift, Abso, Temp, Enter, etc. |
| Sensor Inputs | Dual sensor inputs (Cell 1 and Cell 2) |
| Memory | Non-volatile EEPROM for operating parameters and calibration data |
🔌 Electrical Specifications
| Feature | Specification |
|---|---|
| Supply Voltage | 120 V AC (A option) |
| Supply Frequency | 50 or 60 Hz, ±3 Hz |
| Analog Outputs | Two isolated outputs: 4–20 mA (I option); Output #1 and #2 configurable |
| Alarm Contacts | Two Form C contacts, 5 A noninductive, 125 V AC/30 V DC (min 1 A) |
| Output Isolation | Isolated, powered outputs |
| RFI Susceptibility | Compliant with European EMC Directive 89/336/EEC when cables are in grounded conduit |
📏 Measurement Specifications
| Feature | Specification |
|---|---|
| Measurement Ranges | 0–2.000, 0–5.000, 0–10.00, 0–20.00 MΩ·cm |
| Display Units | MΩ·cm or % (for ratio or % rejection) |
| Temperature Range | Measurement: -17 to +150 °C (0 to 302 °F); Compensation: 0 to 120 °C (32 to 248 °F) |
| Accuracy | ±0.5% of full-scale range at 25 °C |
| Response Time | 3 s for 90% change (single sensor, no damping); 7 s (dual sensor) |
| Damping | Configurable: 0, 10, 20, 40, 80, 160 s |
🔧 Configuration and Calibration
| Feature | Details |
|---|---|
| Configuration Mode | Allows setting measurement range, alarms, diagnostics, and output characterization |
| Security | User-configurable security code (default: 0800) |
| Calibration | Electronic bench calibration; sensor-specific calibration with tCF and CF |
| Sensor Compatibility | 871CC sensors (A2–F2: 100 kΩ thermistor; K2–M2: Pt 100 RTD) |
| Cell Factor (CF) | Factory default: 0.1000 cm⁻¹; adjustable for specific sensor |
| Temperature Compensation | Ultrapure water correction referenced to 25 °C or absolute (no compensation) |
🌡️ Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | -25 to +55 °C (-13 to +131 °F) |
| Storage Temperature | Not specified in document |
| Relative Humidity | 5 to 95%, non-condensing |
| Protection Rating | NEMA 4X, CSA Enclosure 4X, IEC IP-65 (metal enclosure) |
✅ Certifications
| Standard | Details |
|---|---|
| FM | General purpose (FGZ); Nonincendive Class I, II, Div. 2, Groups A–D, F, G, T6 |
| CSA (Canada) | Class I, Div. 2, Groups A–D, T6 (for 24 V, 100 V, 120 V AC) |
| EMC | Complies with European EMC Directive 89/336/EEC (with proper cable conduit) |
| RoHS/WEEE | Exempt from RoHS Directive; complies with WEEE Directive |
🛠️ Installation
| Feature | Details |
|---|---|
| Mounting Options | Movable surface mount (Z); also supports panel, pipe, fixed surface (metal only) |
| Wiring | Sensor, power, and alarm wires to TB1, TB2, TB3, TB4; separate conduits for sensor/output and power/alarms |
| Conduit Requirements | 1/2-inch rigid metal or semi-rigid plastic; specific fittings (e.g., T&B #370) |
| Grounding | Outer electrode (green wire) must be grounded for high-voltage solutions |
🚨 Alarms and Diagnostics
| Feature | Details |
|---|---|
| Alarms | Two configurable alarms (HAC, LAC); set points adjustable 0 to full scale |
| Alarm Timers | Trigger, feed, delay timers (0–99 min, 0–9 tenths/hundredths) |
| Hysteresis | 0–99% of full scale, configurable |
| Error Codes | Er 1 (instrument fault), Er 2 (temp error), Er 3 (range error), Er 4 (calibration error) |
| Diagnostics | Troubleshooting for noisy signals, incorrect readings, gas bubbles, etc. |
📦 Ordering Information
| Field | Details |
|---|---|
| Model Number | 873RS-AIYFNZ-7 |
| Code Breakdown | A: 120 V AC; I: 4–20 mA outputs; Y: Pipe mount; F: Optional feature; NZ: Movable surface mount; -7: Additional options (not detailed in document) |
| Accessories | Optional storm door, resistor kit for calibration, rear cover (plastic enclosure) |