Sensor Break Protection - Barnstead 47900 Operation Manual

S S M
INGLE ETPOINT
14
& S S
ODELS INGLE ETPOINT
M /OTP
ODELS W
Ld.F: Heater Circuit fault: indication of either
an open or short solid sate relay, a blown
fuse, missing supply or open circuit heater.

Sensor Break Protection

This controller provides sensor break protec-
tion in the event the thermocouple opens. If
an open thermocouple condition occurs, the
digital display will blink "S.br" and the power
to the heating element will be shut OFF
(Cycle light will extinguish).
Over-Temperature Protection
(OTP)
The OTP will be in effect during any alarm
condition when the temperature of the furnace
has deviated beyond the limit. The "Deviation
High" alarm is the only alarm value which can
be changed. To change it, press the SCROLL
button until "IdHi" appears on the display.
Press the UP or DOWN button to select the
OTP value you desire. We recommend a
value of 20° above your working temperature
to provide protection for your workload.
In addition to over-temperature protection,
units containing a single setpoint controller
w/OTP feature a mechanical OTP relay
device which disconnects power from the ele-
ments in an alarm condition (only in furnaces
with OTP relay). See models listed on front
page.