Keller CellaTemp PKF Series, Руководство пользователя

Страница: 8 / 74

8
Operating instructions CellaTemp PK / PKF / PKL xx
5 Function
The pyrometer measures the temperature without contact to the target�
The infrared sensor is equipped with an analogue output and an open collector
output� The instrument‘s display panel shows the measured temperature�
• It generates 2 output signals according to the configured function:
OUT1 Switching threshold
OUT2 Analogue output 0/4���20mA
5.1 Switching threshold
OUT1 changes its switching status when the configured upper and lower
thresholds (
do.SP
,
do.rP
) are exceeded�
First set the upper temperature value of the switching point [ do.SP ]� The
temperature can be defined in °C or °F according to the unit setting� Then set
the lower threshold [
do.rP
]� When you adjust the upper threshold [
do.SP
] the
lower threshold [ do.rP ] will change accordingly� The span remains the same� If
[ do.SP ] is lowered to a value where the span cannot be maintained (as [ do.rP ]
would then fall below its minimum value), the [
do.rP
] is kept with its minimum
value� If [
do.SP
] subsequently increases again, [
do.rP
] also immediately
increases� The minimum distance between [ do.SP ] and [ do.rP ] is 2 K�
5.2 Output signal
The following switching functions can be selected:
• Normally open contact: [
do ] → [ do.Fn ]= no (normally open)
• Normally closed contact: [
do
] → [
do.Fn
]=
nc
(normally closed)
5.3 Upper threshold delay
Once the sensor has detected a temperature which exceeds the switching
threshold [ do.SP ] the time delay [ do.dS ] starts running� When this delay
period has elapsed, the output OUT1 activates switching� This status is sustained
until the lower threshold [
do.rP
] is violated� If this occurs before the time delay
has elapsed, the delay will reset� This function can be used, for example, to
suppress spurious impulse signals at the output�
• Upper threshold delay: [
do
] → [
do.dS
] = 0���10 sec�