Product Core Brief
- Model: 1900/65A
- Brand: BENTLY
- Series: 1900 General‑Purpose Monitor Platform
- Core Function: Stand‑alone multi‑variable monitor for balance‑of‑plant rotating equipment; accepts mixed vibration, position and temperature sensors, generates alert/danger alarms and trip outputs without 3500 rack infrastructureBaker Hugh….
- Product Type: General‑Purpose Equipment Monitor
- Key Specs: 4 dynamic transducer inputs; 4 temperature inputs; 6 SPDT relays; optional Modbus‑TCP; DIN‑rail / bulkhead mount ⚠️ EOL‑retired, 2300 series designated replacement, limited surplus stock.
Product Introduction
BENTLY 1900/65A is a self‑contained monitor built for pumps, fans, blowers, motors and small compressors where full‑size 3500 rack hardware is cost‑prohibitiveBaker Hugh…. Each of the four dynamic channels can be software‑configured for proximity probes, velocity sensors or accelerometers. Four temperature channels handle RTDs and thermocouples.
This unit delivers six user‑programmable relays with AND/OR voting logic, four isolated 4‑20 mA recorder outputs, plus buffered transducer outputs for portable diagnostic toolsBaker Hugh…. The optional Modbus‑TCP gateway exports measurements, alarm states and 200‑entry event logs to DCS / SCADA / System 1 softwareBaker Hugh…. It uses 24‑bit ADC with 25 kHz bandwidth for dynamic signal capture —though your mileage may vary when running long unshielded sensor cables in high‑EMI cabinet environments.
Bently 1900/65A
Key Technical Specifications
| Parameter | Value |
|---|---|
| Dynamic Input Channels | 4 channels; supports proximity probes, 2‑wire /3‑wire velocity, accelerometers |
| Temperature Input Channels | 4 channels; 2‑wire/3‑wire RTD; TC types E, J, K, TBaker Hugh… |
| Alarm Levels | Per‑variable Alert / Danger; channel NOT‑OK fault detection |
| Relay Outputs | 6 SPDT relays; 5 A @250 VAC resistive; latching / non‑latching, energize‑mode configurable; AND/OR voting logicBaker Hugh… |
| Analog Outputs | 4 isolated 4‑20 mA recorder outputs |
| Auxiliary Outputs | 4 buffered transducer outputs on unit; 1 buffered output on remote display port |
| Communications | Optional Modbus‑TCP over Ethernet; Windows‑based local configuration software |
| Power Supply | 18‑36 VDC input; external AC‑power adapter available |
| Mounting | DIN‑rail clip or bulkhead plate mounting; optional remote display (max 75 m cable length)Baker Hugh… |
| Operating Ambient Temperature | ‑40 °C to +70 °C |
| Relative Humidity | 5‑95 %, non‑condensing |
| Physical Weight | 1.32 kg |
| Country of Origin | United States |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Source traceability, serial number anti‑counterfeit check, visual inspection (no corrosion / cracked case / burned terminal blocks). Inspect screw terminals for thread damage.
- Live Functional Test: Full power‑on self‑test; simulate vibration and temperature inputs; verify alert / danger relay actuation and 4‑20 mA scaling; continuous 24‑hr burn‑in with temperature logging. Capture front‑panel LED / display status snapshots every two hours.
- Electrical Parameter Test: Insulation resistance (500 V Megger, >10 MΩ), ground continuity. Flag any resistance drift below threshold.
- Firmware Verification: Read and log firmware revision; verify Modbus‑TCP option activation if fitted; save and photograph complete configuration profile. Well, technically it supports multi‑variable per‑channel processing, but only on firmware v4.2+.
- Final QC & Packaging: Anti‑static bag seal, QC‑passed label with test date. Include matching terminal plug hardware with the unit.
Replacement Pitfall Guide
❗ Firmware Mismatch: Older firmware builds restrict voting‑logic depth and Modbus register mapping. Upload latest supported firmware before deploying spare units.❗ Relay Logic Misconfiguration: Factory defaults are generic. Verify energize‑on‑alarm versus de‑energized‑for‑trip logic before connecting safety‑critical trip circuits. Mis‑wired relay modes can disable machine protection.❗ Display Cable Limitation: Remote display maximum cable length is 75 m. Exceeding this distance causes display drop‑outs or signal corruption.❗ Power Supply Mismatch: Operate strictly within 18‑36 VDC range. Voltage transients above 36 VDC can destroy internal power conditioning without obvious exterior damage. Apply 20 % power headroom for field power supplies.❗ ESD Damage: Use anti‑static mat and wrist strap while wiring terminals. Static discharge can degrade analog input circuitry with zero visible physical signs.
Keep these in mind and you’ll cut 90% of rework time.
Bently 1900/65A
Compatibility Matrix & Benchmarks
- Scan cycle: 18 ms (simulated full‑load: 4 vibration +4 temperature active channels)
- Comms throughput: Modbus‑TCP 10/100 Base‑T Ethernet (option‑dependent)
