Watlow 8LS Controller - Manual (Page 33)

Installation
8LS User’s Guide 25
The range of the standard IRSM is 0-1000 degrees F with an output of
0-10ma dc. The input of the Watlow Anafaze 8LS is configured for a 0-
10madc input.
To use more than four IRSM's with the 8LS, use an external power
supply of 8-15vdc.
If desired, a second input may be used to monitor the internal IRSM
ambient temperature. Consult Watlow Anafaze for more information.
Pulse Input
The single pulse input is used when a speed or flow input is available as
a Open Collector signal of 5Vdc maximum from the transducer. The
frequency range of the input is from 1Hz to 20KHz. The sample time
period is adjustable from 1 to 20 seconds. To enable the pulse input,
select PLS for the input type of the loop that is to be used for the pulse
input. Do not use the analog input terminals. Connect the transducers
output using shielded wiring to the pulse input pin 12 of TB2 as shown:
Carbon Probe Input
The standard zirconia carbon probe as used by the metal treating
industry will have two outputs.
One is the T/C output. A type K, N, R, or S is used. This output will use
standard T/C Extension Wire connecting it to the 8LS.
The second output is the carbon probe output. This output requires using
a special cable due to the electrical and temperature requirements of the
probe and its environment. The cable requirements are two wire with
shield with a high ambient temperature rating of at least 150
o
C.
+
-
12
13
5 Vdc Maximum
Transducer
8LS TB2
Pulse
Input
Logic
Ground