VALTRONICS
R59 Zero Adjust
R58 Span Adjust
1
8
TB1
Green Power
Red Level Exceeded
Set Point
Adjust
R47 Coarse Zero
DO NOT Adjust
R33 Sample Rate
DO NOT Adjust
R3
E1
E2
E3
JP1 shown in
FIXED position
Optional LCD
Display
J1
Set
Point
Relay
K1
9 pin "D"
Test Connector
J2
F1
0.5 Amp
Slow-Blow
Fuse
3 position
Fixed Level Detect
Switch S1
7
6
5
4
3
2
1
5
6
9
TB1
Model 6289 Wiring
3463 Double Springs Road • Valley Springs, CA 95252 • (209) 754-0707 • FAX (209) 754-0104
Page 1
of 3 e-mail:
• Revised: :
10-May-01
© 1994-2001
VALTRONICS
0-5 V out
pin
6
to
5
with DVM
to 4-20 mA input at
controller
- DO NOT
connect 26 VDC
From 24VAC
transformer
The
4-20 mA current loop
(pins 4 & 5)
has its own 15
VDC internal power supply so NO External Power is
required in this loop. Pins 1, 2, 3, are the SET Point
Relay contacts - see the 6289 specification.
20.0 V min
/ 30 max
12 VA
power rating
Level Detect Switch
Middle position is 1000
ppm or 2.5 volts. This
does not effect the
calibration of the sensor
just when the relay
energizes and the RED
indicator comes on.
Customers using an
HVAC controller to
monitor the 4-20 mA
output signal may not
use this function at all.
Placing the jumper JP1 in
the variable position E2
to E3 and adjusting
potentiometer R3 fully
clockwise will keep the
RED indicator OFF until
the level goes above 2000
ppm.
See Application Notes
A25 or A40 for info
about gas calibration
and page 2 for
ZERO
on fresh air. Gas
calibration kits allow
you to flow certified
gas into the
green
plastic cal tube at about
300 ml/min flow rate.
The tube should be
pinched off for normal
operation.
optional ground on pin 8
A minor ZERO adjustment
on fresh air of about 400 ppm
CO
2
may be necessary after
installation. Adjust R59
(ZERO) next to the RED
indicator for a 0-5 voltage
output of 1.0 volts for fresh
air. Try to assure that the air
is fresh inside the duct. DO
NOT adjust SPAN without
calibration gas.
The COARSE ZERO
adjust may be used to
center the fine zero
adjust R59 but adjust it
slowly.
There is a 10
second delay
in the
response.
Application
Note A51
Model 6289 Wiring & Calibration Adjustments
CAUTION
: DO NOT connect a Model 6289 to the same
24 VAC transformer that powers an older Model 2088 or
2089
since they require a floating 24 VAC. TB1, Pin #8 on
the 6289 is grounded and this may burn out the 2088 or
2089 power supply.
8
7
6
5
4
3
2
1
24 VAC
TB1
