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34-SM-03-01
Page 8
Operating Conditions
Parameter
Ambient Temperature
Meter Body Temperature
Humidity
Vacuum Region - Minimum Pressure
mmHg absolute
inH 2 O absolute
Supply Voltage, Current, and Load
Resistance
Maximum Allowable Working
Pressure (MAWP)
(ST 3000 products are rated to Maximum
Allowable Working Pressure. MAWP depends
on Approval Agency and transmitter materials of
construction.)
* For CTFE fill fluid, the rating is –15 to 110°C (5 to 230°F).
† Short term equals 2 hours at 70°C (158°F).
** Consult factory for MAWP of transmitters that require CSA approval (CRN)
Resistance
SMV 3000 Specifications
Reference
Condition
°C
25 ±1
77 ±2
°F
°C
25 ±1
°F
77 ±2
%RH
10 to 55
Atmospheric
Atmospheric
Voltage Range: 10.8 to 42.4 Vdc at terminals
Current Range: 3.0 to 20.8 mA
Load Resistance: 0 to 1440 ohms (as shown in Figure 7).
SMA110 = 100 psi, 7 bar **
SMA125 = 750 psi, 52 bar **
SMG170 = 3000 psi, 210 bar **
Static Pressure Limit = Maximum Allowable Working Pressure (MAWP) =
Overpressure Limit
1440
1200
Loop
800
(ohms)
650
450
250
0
10.8 16.28 20.63 25 28.3
Operating Voltage (Vdc)
Figure 7 —Supply Voltage and Loop Resistance Chart.
Rated
Operative
Condition
Limits
–40 to 85
–40 to 93
–40 to 185
–40 to 200
–40 to 110 *
–40 to 125 *
–40 to 230 *
–40 to 257 *
0 to 100
0 to 100
25
2 (short term†)
13
1 (short term†)
= Operating
Area
NOTE: A minimum of 250
0hms of loop resistance is
necessary to support
communications. Loop
resistance equals barrier
resistance plus wire
resistance plus receiver
resistance. Also 45 volt
operation is permitted if
not an intrinsically safe
installation.
37.0
42.4
21012
Transportation
and Storage
–55 to 125
–67 to 257
–55 to 125
–67 to 257
0 to 100
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