Bently Nevada 3500/40 149716-01 Over range sensor

Description

If a channel fails a verification test you should attempt to recalibrate the sensor
and redo the test. If the channel still fails the verification test, replace the sensor,
calibrate the newly replaced sensor, and then redo the test. If the channel still
fails the verification test you should replace the 3500/63 monitor. Refer to Section
1.2 for Handling and Storing Considerations.

You cannot repair the boards and components inside the 3500 modules in the
field. You should replace modules that are not operating correctly with a spare.
DANGER
High voltage present. Contact with high
voltage can result in burns, shock, or
death. Remove power from 3500 and
avoid contact with exposed contacts
and wiring to avoid injury.

When performed properly, you may install the monitor modules into or remove
them from the rack while power is applied to the rack. Refer to the Rack
Installation and Maintenance Manual (part number 129766-01) for the proper
procedure to do so.
1. Save the configuration for the module using the Rack Configuration
Software.
2. Replace the module with a spare. Refer to the installation section in the
3500 Monitoring System Rack Installation and Maintenance Manual
(part number 129766-01).
3. Return the faulty module to Bently Nevada, LLC for repair.
4. Download the configuration for the spare module using the Rack
Configuration Software.
5. Recalibrate all the channels of the new monitor after connecting them to the
sensors per Section 8.1.2 on page 63. You MUST perform this recalibration to
ensure that the sensor and monitor will function correctly.
6. Verify the operation of the spare module per Section 9.1 .

The sensor itself completes a Wheatstone bridge. When not interfaced to a
monitor and unpowered, the sensor leads will measure approximately:
White to black: 6.5 ohms
White to red: 3.3 ohms
Red to black: 3.3 ohms
When a +24V supply is interfaced to the back of the I/O module and the sensor is
not connected, the sensor terminals, +Pwr to -Pwr on the I/O, should read +24 V.
The power provided to the sensor is 300mA, constant current.
When interfaced to a monitor, powered, and with no gas present the voltage
across the sensor leads (at the I/O or at the termination strip in the housing) will
read approximately:
White to black: +5.5 to 5.7 V
White to red: +2.5 to 2.8 V
Red to black: +2.5 to 2.8 V

This configuration applies more current than 300mA to the sensor and eventually causes one
bead of the Wheatstone bridge in the sensor to open, at which point the channel goes into overrange. This irreversibly damages the sensor and makes it unusable. Replace the sensor.
Removing the fault would result in the reverse indications of those shown
in the table. For example, if there was an intermittent opening and then
closing of the red lead the indications may be:
Upon opening the red lead:
• Channel Status goes to Not OK, invalid;
• OK LED goes off;
• Bypass LED comes on;
• Messages are: Enter Not OK, Probable Open Transducer
Then, upon closing the red lead:
• Channel Status goes to OK
• OK LED comes on;
• Bypass LED goes off;

Details: If you need urgent delivery orders, please feel free to contact us, and we will try our best to meet your needs.
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135785-01 3500/93 Display Unit, non backlighted
135785-02 3500/93 Display Unit, back-lighted
137412-01 3500/93 Manual
135799-01 3500/93 Display Interface Module
135799-02 3500/93 Display Interface Module
(use with A05 option only)
135813-01 3500/93 Display Interface I/O
Module
136634-0010-01 10 Foot (3 metres) Cable (PVC)
136634-0050-01 50 Foot (15 metres) Cable (PVC)
136634-0050-02 50 Foot (15 metres) Cable
(Teflon? )
136634-0100-01 100 Foot (30 metres) Cable (PVC)
136634-0100-02 100 Foot (30 metres) Cable
(Teflon? )
130121-02-01 500 Foot (152 metres) Extension
Cable (PVC)
130121-02-02 500 Foot (152 metres) Extension
Cable (Teflon? )
02200271 External Power Supply for 115 Vac
02200272 External Power Supply for 230 Vac
138227-01 Cable Adapter
146085-01 Power Cable
137224-01 System Mounting Assembly
(sheet metal for A01 & A05
options)
04309007 4-40 X 0.63 Phillips head screw for
System Mounting Assembly, 4 are
required