
925-0289 Rev D 10
6.0 Sensitivity Selection
Sensitivity Setting (typical) Material Characteristics
Pos. A: Use this setting only for very light material with densities
down to 1.25 lb./cu. ft., (20g/l) The sensitivity is very high at
this setting.
Pos. B: Standard setting, sufficient for most materials.
Pos. C: For heavy materials with high densities which may form a
deposit on the vibrating blade. As the sensitivity of the
instrument is low at position C, very light material such as
expanded styrofoam cannot be detected at this setting.
For special model SEDIMENT VR only B or C must be used, see special instructions for SEDI-
MENT!
7.0 LED
The LED on the pcb is a visual indication of the status of the vibrating rod relay. The LED will be
flashing when the relay is de-energized and will be ON solid when the relay is energized. The Fail
Safe jumper position will determine when the relay is energized.
8.0 REMOTE ELECTRONICS INSTALLATION
In some applications such as excessive vibration or ambient temperatures above +140F, it may
be necessary to locate the electronic circuit board away from the vibrating rod. In these applica-
tions, a separate remote enclosure is used to mount the circuit board, and a special cable with
individually shielded conductors is used to interconnect the circuit board to the vibrating rod unit.
The remote electronics option is available for the VR-21 and VR-41 vibrating rods.
Figure 5 shows the mounting hole locations for the remote electronics enclosure. The intercon-
necting cable connections are also shown in Figure 5. The input power is supplied to the remote
electronics and an the special individually shielded conductor cable is routed between the remote
electronics and the vibrating rod. The interconnect cable will have a wire connecting terminal “T”
on the remote board to terminal “T” in the vibrating rod; terminal “R” on the remote board to termi-
nal “R” in the vibrating rod; and signal ground on the remote board to signal ground in the vibrating
rod.
Fail Safe Setting V Rod Status LED Status Relay Status
LUNCOVERED FLASHING DE-ENERGIZED (COM CONNECTED TO NC)
LCOVERED ON SOLID ENERGIZED (COM CONNECTED TO NO)
HUNCOVERED ON SOLID ENERGIZED (COM CONNECTED TO NO)
HCOVERED FLASHING DE-ENERGIZED (COM CONNECTED TO NC)