The 3500/70-01-00 from Bently Nevada belongs to the trusted 3500 series machinery protection system. This monitor is specifically designed for reciprocating compressor applications. It continuously compares vibration parameters against configured alarm setpoints. Therefore, it provides essential protection for crankcase and crosshead vibration monitoring.
This section covers the most important technical details of the 3500/70-01-00. The monitor accepts one to four proximity probe or seismic transducer signals. Input impedance is 10 kΩ for acceleration inputs and over 1 MΩ for velocity inputs. Power consumption is 7.7 watts nominal.
The sensitivity ranges vary by measurement type. For Impulse Acceleration, the range is 0.51 – 11.72 mV/(m/s²). For Recip Velocity, the range is 3.54 – 22.64 mV/(mm/s). Additionally, the Low Frequency Recip Velocity mode uses the same sensitivity range.
Each channel allows programmable alert and danger setpoints. You can configure alert setpoints for every active static value. Meanwhile, danger setpoints apply to any two active static values. The front panel includes buffered outputs via coaxial connectors for each channel. Output impedance is 550 Ω typical, and each connector is short-circuit protected.
Recorder outputs provide +4 to +20 mA signals proportional to the monitor’s full-scale range. The load resistance maximum is 600 Ω. Update rate is less than 100 milliseconds. Accuracy is within ±0.05 mA, or ±0.14 mA over the temperature range.
The 3500/70-01-00 uses multiple filters for signal conditioning. For Impulse Acceleration, the bias filter is -3 dB at 0.01 Hz. A low-pass Not OK filter is set at -3 dB at 2400 Hz. Filter quality includes a 4-pole high-pass filter providing 80 dB per decade.
For Recip Velocity, an integration filter is added at -3 dB at 0.34 Hz. The 1X and 2X vector filter uses a constant Q filter with bandwidth equal to ±3% of running speed. Therefore, the monitor delivers precise measurements even in challenging environments.
The operating temperature range depends on the I/O module used. With internal or external termination modules, the range is -30°C to +65°C (-22°F to +149°F). When using the internal barrier I/O module, the range is 0°C to +65°C (32°F to +149°F). Storage temperature limits are -40°C to +85°C (-40°F to +185°F). Additionally, humidity tolerance is 95% non-condensing.
The monitor module itself measures 241.3 mm x 24.4 mm x 241.8 mm. It weighs 0.91 kg (2.0 lb). The I/O module (non-barrier) weighs 0.20 kg. Consequently, the total shipping weight is approximately 1.36 kg when packaged safely.
This monitor occupies one full-height front slot in the 3500 rack. The corresponding I/O module takes one full-height rear slot. Installation requires careful handling due to sensitive electronic components. Always follow the manufacturer’s guidelines for rack configuration.
The front panel LEDs provide clear status indication. The OK LED lights when the 3500/70-01-00 operates correctly. The TX/RX LED shows communication activity with other modules. The Bypass LED indicates when the monitor is in Bypass Mode. These indicators simplify troubleshooting and maintenance.
3500/70-01-00 Recip Impulse/Velocity Monitor Module (Main Board) – 1 unit
I/O Module with Internal Terminations (Prox/Velom type) – 1 unit
Installation manual (printed brief version)
All orders ship via FedEx, UPS, or DHL. Tracking numbers are provided within 24 hours after dispatch. International shipping is available for most destinations.
1. What is the primary application of the 3500/70-01-00?
This monitor is designed for reciprocating compressor protection. It specifically monitors crankcase and crosshead vibration using seismic transducers.
2. How many channels does the Bently Nevada 3500/70-01-00 support?
The 3500/70-01-00 supports up to four input channels. Each channel can be configured independently for different measurement modes.
3. What configuration software is required for this monitor?
You need the 3500 Rack Configuration Software to program each channel. This software allows you to set alarm setpoints and select measurement functions.
4. Can I use proximity probes with this velocity monitor?
Yes, the 3500/70-01-00 accepts proximity probe signals. The I/O option 01 includes Prox/Velom I/O Module with internal terminations.
5. What do the front panel LEDs indicate?
The OK LED shows normal operation. The TX/RX LED indicates communication with other rack modules. The Bypass LED lights when the monitor is in Bypass Mode.
| Brand Name | Bently Nevada |
| Model No. | 3500/70-01-00 |
| Product Type | Reciprocating Compressor Monitor |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
