Siemens 7MF4233 series

UMSITRAPDS3-1 Model Designations and Specifications
November 2005
9-25
TABLE 9-16 Specifications, Absolute Pressure and Filling Level Models
Device type: Absolute pressure Filling level
Pressure series 7MF4233 Diff. pressure series 7MF4333 7MF4633 / 7MF4912
Application range
See Table 9-17 See Table 9-20 See Table 9-21
Function
Measurement principle Piezoresistive
Input
Measurement variable Absolute pressure Filling level
Measurement range
 Span (continuously adjustable) 0.12 to 435 psia (4 ranges) 0.12 to 2325 psia (5 ranges) 2.9 to 72 psia (4 ranges)
Nominal pressure (PN) 470 psi
Nominal pressure (PN) 2325 psi
Nominal pressure (PN) 6174 psi
 Lower measurement limit -100% of max span or
- Measuring cell with silicone oil filling 0 psi (absolute) 0.43 psi (abs) depending
on remote seal
- Measuring cell with inert filling liquid
for process temp. -20 °C < ϑ < 60 °C
0.43 psi (absolute)
for process temp. +60 °C < ϑ < 100 °C 0.43 psi (abs) + 0.29 psi (abs) - ((ϑ - 60 °C) / °C)
(max. +85°C for 485 psi meas. cell)
 Upper measurement limit
+100% of maximum span; maximum 2325 psi in oxygen
measurement and inert filling liquid 2325 psi
+100% of max span
 Start of scale (continuously adjustable) Between the measuring limits
Output
Output signal 4 to 20 mA
 Lower limit (continuously adjustable) 3.55 mA, factory set to 3.84 mA
 Upper limit (continuously adjustable) 23.0 mA, factory set to 20.5 mA or optionally 22.0 mA
 Ripple (without HART communication)
Ipp ≤ 0.5% of maximum output current
 Electric damping
- adjustable time constants (T
66
) 0 to 100 seconds in steps of 0.1 seconds, factory set to 0.1 seconds
 Current transmitter Adjustable 3.55 to 23 mA
 Failure signal Adjustable 3.55 to 23 mA
Load
 without HART communication
R
B
≤ (U
H
- 10.5V) / 0.023A in Ω, U
H
: power supply in V
 with HART communication
R
B
= 230 to 500Ω (HART-Communicator) or R
B
= 1100Ω (HART-Communicator)
Characteristic Forward acting or reverse acting
Measuring accuracy
Reference conditions
Forward acting, zero based, process diaphragm stainless steel; For flange level flush mount,
silicone oil filling and room temperature 25°C
r = maximum span / set span = span ratio
Measurement error (limit point setting,
including hysteresis and repetitive accuracy)
 linear characteristic
r ≤ 10 ≤ 0.1% ≤ 0.15 %
10 < r ≤ 30 ≤ 0.2 % ≤ 0.3 %
30 < r ≤100 ≤ (0.0075 · r + 0.075)%
 Repetitive accuracy Contained in measuring error
 Hysteresis Contained in measuring error
Transient time (T
63
, without electrical damping) About 0.2 seconds
Long-term drift over 12 months
≤ (0.2 · r) % ≤ ( 0.1 · r) %