Product Core Brief
- Model: 1900/65A‑00‑00‑02‑00‑01
- Brand: BENTLY
- Series: 1900 General‑Purpose Monitor Platform
- Order Suffix Breakdown
- 00 = Power: 18‑36 VDC input
- 00 = Display: No local / remote display hardware
- 02 = Mounting: Bulkhead / wall‑mount plate hardware fitted
- 00 = Approvals: Standard base certifications, no additional hazardous‑area approvals
- 01 = Communications: Factory‑installed Modbus‑TCP Ethernet gateway
- Core Function: Stand‑alone multi‑variable monitor for pumps, fans, blowers and small rotating equipment. Accepts vibration, position and temperature sensors, generates alert/danger relay outputs and exports measurement data over Ethernet to DCS / SCADA / System 1. No rack‑based infrastructure required.
- Product Type: General‑Purpose Equipment Monitor, bulkhead‑wall mount, DC‑powered, display‑less, factory‑fitted Modbus‑TCP.
- Key Specs: 4 dynamic transducer inputs; 4 temperature inputs; 6 SPDT relays; 4 isolated 4‑20 mA outputs; integrated Modbus‑TCP Ethernet ⚠️ EOL‑retired; 2300 series designated replacement; limited surplus stock.
Bently 1900/65A
Product Introduction
BENTLY 1900/65A‑00‑00‑02‑00‑01 is a display‑less bulkhead‑mount variant of the 1900/65A monitor. It ships with bulkhead mounting hardware instead of DIN‑rail clips, and runs from 18‑36 VDC plant DC supply. There is no front‑panel screen; all configuration is completed via PC configuration software connected over service port or Modbus‑TCP Ethernet.
This unit processes proximity probes, velocity sensors or accelerometers on four dynamic channels, plus RTD and thermocouple signals on four temperature channels. It provides six programmable SPDT relays for alarm and trip logic and four isolated 4‑20 mA analog outputs for DCS recorders. This exact part number comes factory‑equipped with Modbus‑TCP Ethernet, so no separate communications upgrade kit is needed. It uses 24‑bit ADC with 25 kHz dynamic bandwidth —though your mileage may vary when running long unshielded sensor cables inside high‑EMI cabinet environments.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Dynamic Input Channels | 4 channels; proximity probes, 2‑wire /3‑wire velocity, accelerometers |
| Temperature Input Channels | 4 channels; 2‑wire/3‑wire RTD; TC types E, J, K, T |
| Alarm Levels | Per‑channel Alert / Danger; channel NOT‑OK fault detection |
| Relay Outputs | 6 SPDT relays; 5 A @250 VAC resistive; latching / non‑latching; AND/OR voting logic |
| Analog Outputs | 4 isolated 4‑20 mA recorder outputs |
| Auxiliary Outputs | 4 buffered transducer outputs |
| Communications | Factory‑installed Modbus‑TCP 10/100 Base‑TX Ethernet; local service configuration port |
| Power Supply | 18‑36 VDC; typical 0.35 A, max 1.0 A |
| Mounting | Bulkhead / wall‑mount plate (factory fitted); DIN‑rail hardware not included |
| Local Display | None; configuration via PC software only |
| Operating Ambient Temperature | ‑40 °C to +70 °C |
| Relative Humidity | 5‑95 %, non‑condensing |
| Dimensions | 196.9 mm ×149.4 mm ×74.4 mm |
| Physical Weight | 0.81 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. Confirm suffix code matches 1900/65A‑00‑00‑02‑00‑01 to verify bulkhead mount, no display and factory‑enabled Modbus‑TCP.
- Live Functional Test: Full power‑on self‑test; simulate vibration and temperature inputs; verify alert/danger relay actuation and 4‑20 mA scaling; validate Modbus‑TCP register read‑back; continuous 24‑hr burn‑in with temperature logging. Since no front‑panel display exists, read status entirely through configuration software.
- 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; confirm Ethernet Modbus‑TCP option flag shows enabled. 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 and bulkhead mounting plate with the unit.
Replacement Pitfall Guide
❗ Mounting Hardware Difference: This unit uses bulkhead‑wall mounting plate. DIN‑rail clips are not fitted from factory. Do not attempt to force DIN‑rail installation without add‑on adapter kit.❗ No Local Display: There is no front‑panel keypad‑display. All setup, tuning and troubleshooting must be done with PC configuration software. You cannot adjust thresholds locally on the unit itself.❗ Network IP Configuration Risk: Modbus‑TCP is factory‑enabled but ships with default IP address. IP conflict will occur if multiple monitors share the plant network without re‑addressing before commissioning.❗ 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.❗ 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‑TX Ethernet (factory‑enabled)
