Span/zero pots, Transmitter interconnect terminal strip, Test points – RKI Instruments 35-3010RKA-08 User Manual
Page 10
6 • 35-3010RKA-08 Sample-Draw Detector
LEL Transmitter
The LEL transmitter is mounted to the left of the oxygen transmitter and above the main
circuit board. It consists of the span pot, zero pot, one internally wired terminal strip, and
the test points.
Figure 3: LEL Transmitter Component Location
Span/Zero Pots
The span and zero pots are located at the bottom edge of the transmitter and are used for
calibration. Use the span pot to make adjustments to gas response readings and the zero
pot to make adjustments to the zero reading
Transmitter Interconnect Terminal Strip
The transmitter interconnect terminal strip is the seven-point terminal strip near the right
edge of the transmitter. The transmitter is factory wired to the sensor and main circuit
board.
Test Points
The test points are located on the left side of the transmitter and are labeled TP+ and TP-.
A 100 mV - 500 mV output is available at these test points for use during calibration.
24V
4-20
GND
TP+
P/N 57-1050RK
REV. 0
PO
W
E
R
/SI
G
WHT
RED
SPAN ZERO
TP-
SE
N
S
O
R
IN
ST
R
U
M
EN
T
S
BLK
GRN
Span Pot
Zero Pot
Interconnect
Terminal Strip
Test Point TP+
Test Point TP-