Emerson VSG & VSSG Specifications download pdf (Page 9)

100

Instrumentation Requirements

Temperature

There are four temperature readings required for

processor control, as listed below.

5. Suction temperature RTD measures the tem-

perature of the incoming suction gas, and is

used to provide annunciation for low suction

temperature when the unit is running.

6. Discharge temperature RTD measures the

temperature of the gas/oil mixture as it is dis-

charged from the compressor housing, and pro-

vides annunciation for high running discharge

temperature.

7. Oil Separator temperature RTD measures the

temperature of the oil in the separator sump,

and gives the oil temperature start permissive

and low running separator temperature an-

nunciation.

8. Oil Injection temperature RTD measures the

temperature of the oil as it is injected into the

compressor, which provides annunciation for

either high or low running oil injection tem-

perature.

* Additional RTD’s may be required and installed

by the customer for temperature readings at

customer specified points such as discharge gas

temperature from the package boundary, cooling

water temperature to and/or from the oil cooler,

gas aftercooler temperature, etc.

Pressure

There are four pressure transducers required to read

system pressures as listed below.

1. Suction pressure transducer (-15.0 - 300 PSIG)

measures the gas suction pressure into the com-

pressor housing, which provides the permissive

to start for minimum suction pressure, and is

used for annunciation of low suction pressure

while running and in the capacity control logic.

2. Discharge pressure transducer (-15.0 - 300 PSIG)

measures the discharge pressure of the process

gas in the separator, which provides annuncia-

tion for high discharge pressure, and may also

be used for capacity control logic.

3. Oil Filter Inlet pressure transducer (-15.0 - 300

PSIG) measures the oil pressure as it enters the

oil filter canisters and is used to calculate oil filter

differential pressure to provide annunciation of

high filter differential pressure

4. Oil Manifold pressure transducer (-15.0 - 300

PSIG) measures the oil pressure downstream of

the oil filter as the oil is injected into the com-

pressor, and provides annunciation protection

for low prelube oil pressure, and low running oil

injection pressure.

Additional pressure transducers may be required and

installed by the customer for pressure readings at cus-

tomer specified points such as process gas discharge

pressure from the package boundary, cooling water

pressure to and/or from the oil cooler, etc.

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Emerson VSG & VSSG Specifications Page 9

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