Liquid Controls SP2850 (MS-649) - Manual (Page 29)

Sponsler, Inc. Model SP2850-TC with MS649 Page 29 DOC#: MN-2850
CALIBRATION
NOTE: All units are calibrated and jumper options set for the required operations at the factory prior to shipment.
The following procedures should be used only if operating requirements have changed. Calibration should only be
attempted by someone who has the equipment to generate a very accurate frequency signal and who has the
training to open the unit and work with grounded equipment necessary to protect the static sensitive CMOS circuitry.
REMOVING THE CASE
To install or change the input or data interface cards, the case must be removed. Before opening case, remove all
power. CMOS logic is used. Use standard precautions against damage by static discharge. If the unit has a data
interface option RS232/422/422M), two screws in the back, designed to secure the top left connector, may have to
be removed. Next remove the six (6) flat head 4-40x1/4” screws behind the panel and lift off the panel/lens
assembly. Slide the main board display out the front of the case. Once modifications are made, reverse the
procedure to re-assemble the unit, insuring that the main board is in the track. The six (6) screws that hold the
panel must be tight to seal the rubber keypad panel assembly, approximately 0.6 in” lb. Torque.
OUTPUT ADJUST
R44 Analog output 0 adjust
R45 Analog ouput SPAN adjust
R8 0-10V out = 47.5K ohm 1%
0-5 V out = 22.1K ohm 1%
ANALOG OUT CALIBRATION
To calibrate the analog output, you need: 1-Signal Generator (5 kHz or 10 kHz +/- 1Hz),1-Amp Meter (Volt Meter for
Voltage). After the case is removed (see above), power the unit and make the following selections:
MENU ITEM
SETTINGS
RATE K-Factor = 1, Window = 2, Sig Fig = 6, weight = 0
ALG OUT Alg Rate, Set Low = 0, Set Hi = Frequency selected above, i.e. 5000 or 10000
COMP IN In Type = Manual, Temp.,
°F, Ent Temp. = 60
FLUID Ref Dens = 1, Ref Temp = 60, Exp Coef = 0
FLOW EQ Cor Vol
3
4
12
13
15
16
17
18
-
-
-
-
-
-
-
-
Analog Output
Input A
Ground (-DC)
+12V out
Isolated -12V
Isolated +12V
AC In
AC In Apply signal and connect Amp Meter
as shown. Adjust R45 until output
reads 20.0mA. Remove signal and
adjust R44 until output reads 4.0mA.
Re-apply signal and adjust R45 until
output reads 20.0mA. Repeat 3 to 4
times with and without signal until both
high (20mA) and low (4mA) are stable.
(To calibrate for voltage, place volt
meter between pins 3 (+) and 12 (-).
Apply high voltage, remove signal,
adjust R44 to read low voltage.)
Frequency Generator
Common
Signal
+24 VDC
+ -
Amp Meter
110/220 VAC
50/60 Hz