401-400 Series0 pages

DREXELBROOK

®

A Leader In Level Measurement Solutions

401-0400 Series
Single Channel Receiver
Verify™ loop diagnostics allow remote
manual check and continuous selftesting.
This Single Channel Receiver supplies a 4-20 mA
loop to, and monitors the status of, a two-wire,
on/off level control transmitter (RF, or, Ultrasonic
Technology). It provides relay indication of loop
status, showing loop in 1) normal, 2) alarm 3) fault
condition 4) Verify test in progress.
Choosing the Verify option provides a remotely
activated test which completely and positively
checks the spill prevention system, including the
loop wiring, sensing element, and final control
elements.

Continuous Level Simulation Means
Maximum Assurance
Continuous automatic verification (high level
duplication), along with manual magnetic key
certification, testing the entire control loop
(including final control elements) giving the
ultimate in performance reliability.

Two-Wire Continuous Loop
Diagnostics
Two-wire design allows for continuous selfchecking loop diagnostics, which check the
twisted pair for open and short circuits. The
system was designed for intrinsically safe outputs.

Two-Wire Overall Installed Cost
Savings
Two-wire technology eliminates need for line
power at the field transmitter and saves on costs
for associated hardware.

With the AutoVerify option, a test pulse occurs
every ten seconds, signaling the Verify test at the
transmitter and duplicating a high level condition
at the sensing element. The receiver then checks
that the switch has responded properly.
If the switch does not respond to the test, the
receiver indicates a fault condition in the output
loop. The receiver provides DPDT relay output
for fault indication. (NOTE: When using the Single
Channel Receiver with the Two Wire IntelliPoint
product, specify receiver without Verify. Verify is
an onboard feature of the IntelliPoint.)

The Most Complete System Testing
Package Available.
To test the entire control loop, and any final
control elements, a Certify™ test may be
activated manually at the receiver. This manual
test not only tests the entire spill prevention
system, but also checks that the AutoVerify selfcheck circuitry is functioning.