Kobold MAS Series, Instruction Manual

Page: 51 / 54

MAS Instruction Manual
Page 51
Refer to Section 3, O
PERATION
, for detailed instructions.
1. Install your MAS into the gas flow line. If you are using 1 /
4
-inch
pipe use a good quality paste pipe thread sealant for sealing and
tighten 1
1 /
2
turns beyond hand-tight. Do not over-tighten. (Refer
to Section 2.4, P
LUMBING
C
ONNECTIONS
.)
CAUTION! Over-tightening will crack the fittings and CAUTION! Over-tightening will crack the fittings and
CAUTION! Over-tightening will crack the fittings and CAUTION! Over-tightening will crack the fittings and
CAUTION! Over-tightening will crack the fittings and
shift calibration.
shift calibration. shift calibration. shift calibration. shift calibration.
CAUTION! Be sure the arrow on the side of the trans- CAUTION! Be sure the arrow on the side of the trans- CAUTION! Be sure the arrow on the side of the trans- CAUTION! Be sure the arrow on the side of the trans- CAUTION! Be sure the arrow on the side of the trans-
ducer points in the direction of flow.
ducer points in the direction of flow.
ducer points in the direction of flow. ducer points in the direction of flow.
ducer points in the direction of flow.
The line pressure and temperature should not exceed 150 psig
(10 kg/cm
2 gauge) or 150
°
F = 65.556
°
C.
2. Apply power to your MAS. If you are using the Kobold MAS-
5000 power supply, plug the power supply into line power and
the connector into the input power jack on the side of your MAS.
(Refer to Figure 2-2 in Section 2, I
NSTALLATION
.) If you are
providing your own power, use 12 to 15 VDC at 100 mA max. (24
VDC operation is made possible by board changes provided by
Kobold.)
CAUTION! Do not DC power at the “D” connector
while using an MAS-5000 power supply at the DC power jack.
DO NOT plug power connector into DB9 connector. Damage to
electronics will result. The “D” connector pinout diagram is in
Section 2.5.1.
IMPORTANT! IMPORTANT! IMPORTANT! IMPORTANT! IMPORTANT! Failure to follow proper power-up procedures
will result in a blown integrated circuit. Blown integrated
circuits are the most common cause of instrument failure.
3. Upon application of power, the output signal will be at a high
level for the first 10 to 20 seconds, after which (assuming zero
flow) it will drop to zero (or 4 mA, depending on output configu-
ration). Allow at least 15 minutes for warm-up.
4. After the warm-up period, your MAS is now monitoring the gas
mass flow rate.
5. Output Signals: The output signal of MAS is either 0-5 VDC
(standard) or 4-20 mA (optional). The output is linearly propor-
tional to the gas mass flow rate. The full scale range and gas are
shown on the front label of your MAS. Section 2.5, E
LECTRICAL
C
ONNECTIONS
, describes the electrical output signal hookup.
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INSTRUCTIONS
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