Overview
Configured for six-channel temperature signal acquisition in the Bently Nevada 3300 Series, the Bently Nevada 81228-01 (81228-01 6-Channel Temperature Monitor) accepts temperature sensor inputs and processes each channel independently for rack-level monitoring and alarm functions. The 3300 temperature monitor family supports thermocouple or RTD input configurations
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 81228-01 |
| Brand | Bently Nevada |
| Series | 3300 Series |
| Product Type | 6-Channel Temperature Monitor |
| Origin | USA |
| Number of Channels | 6 independent channels |
| Input Configuration | RTD or thermocouple, depending on monitor configuration |
| Recorder Outputs | +4 to +20 mA, +1 to +5 VDC, or 0 to -10 VDC options are documented for the 3300 temperature monitor family |
| Output Impedance | 100 ohm |
| Minimum Load Resistance | 10 kohm for voltage outputs |
| Current Output Load | 0 to 600 ohm |
| Operating Temperature | 0 deg C to +65 deg C |
| Storage Temperature | -40 deg C to +85 deg C |
| Relative Humidity | Up to 95%, non-condensing |
| Weight | 2.8 kg reported for the corresponding 3300 temperature monitor configuration |
The documented 3300 temperature monitor data specifies recorder accuracy at +25 deg C, with separate accuracy values for current and voltage output configurations.
Machinery Temperature Signal Processing
The module provides six independent temperature measurement channels. Each channel receives a sensor signal and passes the measured value into the 3300 monitoring architecture for display, recording, and alarm processing. The documented 3300 monitor family uses separate configurations for thermocouple and RTD inputs rather than treating all sensor types as a single fixed input configuration.
For RTD configurations, documented options include 3-wire and 4-wire resistance sensors. Thermocouple configurations include Type J, K, T, and E options. Therefore, the installed monitor configuration and associated transducer type should be verified before replacement.
The recorder interface can provide proportional analog signals. The documented options include +4 to +20 mA, +1 to +5 VDC, and 0 to -10 VDC. The corresponding output loading limits depend on the selected signal format.
Frequently Asked Questions
Q: How many temperature channels does the 81228-01 monitor provide?
A: The 3300 temperature monitor provides six independent temperature monitoring channels.
Q: Can the 81228-01 accept both RTD and thermocouple sensors?
A: The 3300 temperature monitor family uses separate RTD and thermocouple configurations. The installed configuration must match the connected sensor type.
Q: What recorder output signals are documented for this monitor family?
A: Documented recorder options include +4 to +20 mA, +1 to +5 VDC, and 0 to -10 VDC. Output loading and accuracy vary by selected configuration.
Field Installation Guidelines
- Install the monitor only in a compatible Bently Nevada 3300 Series rack position.
- Verify the complete monitor configuration before connecting field temperature sensors.
- Match RTD wiring, sensor resistance characteristics, or thermocouple type with the installed monitor configuration.
- Route temperature sensor wiring separately from high-current power conductors and high-energy switching circuits.
- Maintain the specified sensor polarity and terminal identification for thermocouple circuits.
- Use appropriate shield termination practices for low-level temperature signals and avoid creating unintended ground loops.
- Verify the recorder output type before connecting external recording or control equipment.
- Check the connected load against the documented output impedance and load limits.
- Confirm alarm and trip settings at the system level after installation.
- Do not substitute an RTD or thermocouple configuration without confirming the corresponding 3300 monitor ordering configuration.
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