Bently Nevada 177230-02-02-05 Seismic Transmitter

Bently Nevada 177230-02-02-05 Seismic Transmitter

Product Introduction

The Bently Nevada 177230-02-02-05 delivers advanced machinery protection for critical assets. This seismic transmitter measures absolute vibration velocity in peak units. It outputs a standard 4-20 mA loop signal proportional to peak levels. The device carries multiple global approvals including CSA/NRTL/C and ATEX/IECEx. Therefore, you can install it in hazardous locations with confidence. A ceramic shear sensing element provides excellent stability. The hermetically sealed 316L stainless steel body resists corrosion and moisture. Many engineers choose the 177230-02-02-05 for compressors, fans, pumps, and turbines operating in explosive atmospheres.

Key Technical Specifications

The Bently Nevada 177230-02-02-05 offers a measurement range of 0 – 50.8 mm/s (0 – 2.0 in/s) peak. Its frequency response spans 3 Hz to 1 kHz (180 to 60 kcpm) with ±10% accuracy. The main loop output provides 4 ± 0.3 mA at 0.0 mm/s. At full scale, it reaches 20 ± 2 mA. Settling time stays under 15 seconds within 2% of final value. Additionally, the mounted resonant frequency exceeds 12 kHz. Transverse sensitivity is less than 5% of main sensitivity. The output signal is proportional to peak vibration levels, not RMS.

Hazardous Area Approvals (05 Option)

The 177230-02-02-05 includes the 05 approvals option. This means CSA/NRTL/C certification for North American hazardous locations. It also holds ATEX and IECEx certification for international use. Always check the specific certification documents for zone and gas group compatibility. Installations must follow local electrical codes. The stainless steel housing does not require an additional enclosure in most hazardous areas. Furthermore, the hermetic seal maintains safety integrity over the full temperature range.

Mechanical and Environmental Limits

Operating temperature ranges from -40°C to +85°C (-40°F to +185°F). The transmitter survives 100% relative humidity as long as it is not submerged. Electrical isolation exceeds 10^8 ohms. Breakdown voltage reaches 600 Vrms with less than 1 mA leakage. Shock survivability meets a 9.810 m/s² (1 g peak) drop test. Magnetic field sensitivity stays below 20 μm/s/gauss peak. The Bently Nevada 177230-02-02-05 uses a 316L stainless steel case and 3-pin MIL-C-5015 connector. Both components resist chemical attack and mechanical impact.

Physical Dimensions and Mounting

Diameter measures 25.4 mm (1.00 in). Total height is 66.0 mm (2.60 in). Typical weight reaches 131 g (4.62 oz). The mounting hole in the body uses a 1/4-28 UNF thread. Optional mounting threads include M6 x 1 SI and M8 x 1.25 SI. Recommended mounting torque is 4 to 7 N-m (35.4 to 62.0 in-lbf). For best results, prepare a flat, rigid mounting surface. Apply anti-seize compound to the stud threads. Hand-tighten the sensor first, then torque to specification. Avoid over-tightening, as this may strip the threads or damage the sensor base.

Installation Guidelines for the 177230-02-02-05

First, verify your power supply provides 12-30 Vdc with current limiting around 30-35 mA. Connect Pin A to the positive loop input of your PLC or DCS. Connect Pin B to the loop return. If using the dynamic signal on Pin C, connect it to a high-impedance analog input (≥100 kΩ). Use shielded twisted-pair cable for all wiring. Ground the shield only at the control system end. Meanwhile, ensure the mounting surface is flat within 0.01 mm. For permanent installation, drill and tap a 1/4-28 UNF hole directly into the machine housing. For temporary testing, use a magnetic mount adapter. Finally, apply the specified torque of 4-7 N-m. For hazardous area installations, use certified explosion-proof conduit and seals.

Why Choose This Bently Nevada Model?

This transmitter offers both a 4-20 mA trend signal and a raw dynamic output. Therefore, you save on additional sensors and wiring. The 3 Hz low-frequency cutoff captures slow-speed machinery faults that other sensors miss. The Bently Nevada 177230-02-02-05 carries ATEX and CSA approvals, making it ideal for refineries, chemical plants, and gas processing facilities. Its stainless steel construction resists corrosion from washdowns and chemical spills. Additionally, the wide temperature range suits outdoor installations in extreme climates.

Packaging List

• 1 x Bently Nevada 177230-02-02-05 Seismic Transmitter

• 1 x 1/4-28 UNF mounting stud (pre-installed)

• 1 x protective cap for MIL-C-5015 connector

• 1 x quick start guide (printed)

• 1 x ATEX/IECEx certificate summary

• 1 x CSA/NRTL/C approval information sheet

Note: Shipping via Fedex, UPS, DHL only. No certificates or warranty documents are included in the package.

Frequently Asked Questions (FAQ)

1. What is the difference between the 177230-02-02-05 and the standard 177230-01-01-CN?
The 177230-02-02-05 measures peak vibration instead of RMS. Its frequency range starts at 3 Hz instead of 10 Hz. Additionally, this model carries ATEX, IECEx, and CSA hazardous area approvals. The standard CN model has country-specific approvals but not full hazardous location certification.

2. Can I use this transmitter with a 24V battery system?
Yes, you can. The excitation voltage range is 12 to 30 Vdc. A 24V battery system falls well within this range. Ensure the power source is current-limited to 40 mA or less. Most battery systems with a simple fuse or PTC work fine.

3. How do I interpret the peak output signal on the 4-20 mA loop?
The 4-20 mA signal is linear with peak vibration velocity. At 4 mA, vibration is 0 mm/s peak. At 20 mA, vibration equals 50.8 mm/s peak. For example, 12 mA indicates 25.4 mm/s peak. This differs from RMS output models, where 12 mA would indicate half the full-scale RMS value.

4. Is the dynamic signal on Pin C suitable for spectrum analysis?
Absolutely. The unbuffered dynamic signal on Pin C connects directly to portable data collectors or online analyzers. Use a high-impedance input (≥100 kΩ) to avoid loading the signal. This raw acceleration signal contains valuable frequency information for bearing and gearbox diagnosis.

5. What conduit fittings work with the Bently Nevada 177230-02-02-05 in hazardous areas?
Use certified explosion-proof conduit fittings rated for the specific zone and gas group. The MIL-C-5015 connector requires a mating cable assembly. Bently Nevada offers pre-assembled armored cables with integral connectors. Alternatively, use a certified junction box with a mating receptacle. Always follow local electrical codes for hazardous location wiring methods.