34-ST-03-57 Page 11

Application Data

Liquid Level: Closed Tank Determine the minimum and maximum pressure differentials to be measured (Figure 17).

PMin = (SGp x a) - (SGf x d)

=LRV when HP at bottom of tank

=–URV when LP at bottom of tank

PMax = (SGp x b) - (SGf x d)

=URV when HP at bottom of tank

=–LRV when LP at bottom of tank

Where:

minimum level = 4mA

maximum level = 20 mA

a = distance between bottom tap and minimum level

b = distance between bottom tap and maximum level

d = distance between taps

SGf = Specific Gravity of capillary fill fluid (See Page 9 for values.)

SGp = Specific Gravity of process fluid

Max

Level

 

 

 

b

 

 

 

 

 

 

 

Min

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Level

 

 

 

 

 

 

 

 

 

 

a

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

¥ Transmitter above datum

Max

Level

b

Min

Levela

¥ Transmitter at datum

Max

Level

b

LP

HP

LP

HP

LP

Min

Level

a

HP

¥ Transmitter below datum

24253

Figure 17—Closed tank liquid level measurement distances

Page 11
Image 11
Honeywell STR94G, STR93D manual Application Data

STR94G, STR93D specifications

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