Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/61 |
| Brand | Bently Nevada |
| Product Type | 6-Channel Temperature Monitor Module |
| System | 3500 Machinery Monitoring System |
| Input Channels | 1 to 6 |
| Input Types | RTD and Thermocouple |
| Thermocouple Types | E, J, K, T |
| RTD Types | 100 ohm 3-wire/4-wire Platinum, alpha = 0.00385 or 0.00392; 120 ohm 3-wire/4-wire Nickel; 10 ohm 3-wire/4-wire Copper |
| Input Impedance | Greater than 10 Mohm per lead input |
| Recorder Outputs | +4 to +20 mA per channel |
| Output Load | 0 to 600 ohm |
| Voltage Compliance | 0 to +12 VDC across load |
| Alarm Functions | Programmable Alert and Danger setpoints with time delays |
| I/O Configuration | RTD/TC non-isolated or TC-isolated |
| Configuration Software | 3500 Rack Configuration Software |
| Front Panel Indicators | OK, TX/RX, Bypass LEDs |
| Power Consumption | 9 W nominal |
| Operating Temp | -30 deg C to +65 deg C with internal/external termination I/O modules; 0 deg C to +65 deg C with internal barrier I/O modules |
| Storage Temp | -40 deg C to +85 deg C |
| Humidity | Up to 95%, non-condensing |
| Dimensions | 241.3 mm H x 24.4 mm W x 241.8 mm D |
| Weight | 0.91 kg |
Rotor Dynamics and Temperature Signal Integrity
The 3500/61 processes temperature signals as part of the machinery monitoring architecture. Unlike eddy-current displacement channels, RTD and thermocouple inputs do not require probe gap-voltage scaling. Instead, the monitor conditions the selected sensor signal and evaluates it against configured alarm limits.
Furthermore, the TC-isolated I/O option provides channel-to-channel electrical isolation. This configuration can reduce the effects of external electrical interference when separate temperature circuits operate in the same monitoring installation.
The module supports Type E, J, K, and T thermocouples together with specified platinum, nickel, and copper RTDs. Therefore, the sensor type and wiring arrangement must match the configured channel and installed I/O hardware.
Frequently Asked Questions
Q: How many temperature channels does the 3500/61 provide?
A: The module supports up to 6 independent RTD or thermocouple input channels.
Q: What recorder signal does the 3500/61 provide?
A: Each channel provides a +4 to +20 mA recorder output proportional to the configured monitor full-scale range.
Q: Can RTD and thermocouple inputs be used on the same module?
A: Yes. The supplied data specifies configuration for RTD, thermocouple, or mixed RTD/TC channel applications, subject to the selected I/O module configuration.
Field Installation Guidelines
- Install the monitor module in the designated 3500 rack position and secure the module according to the rack installation procedure.
- Verify that the installed I/O module type matches the selected RTD or thermocouple input configuration.
- Route temperature sensor wiring separately from high-voltage power conductors and high-current switching circuits.
- Maintain appropriate cable shielding and grounding practices to limit electromagnetic interference.
- Confirm RTD wiring configuration before commissioning. Three-wire and four-wire RTD connections require the corresponding terminal arrangement.
- Verify thermocouple type and polarity before applying operating signals.
- Check recorder-output wiring against the connected load and maintain the specified 0 to 600 ohm load range.
- After installation, verify the OK, TX/RX, and Bypass LED states before placing the monitoring channel into service.
- Configure Alert and Danger setpoints using the 3500 Rack Configuration Software and verify the configured sensor range before operation.
Reviews
There are no reviews yet.