
Universal f/I-f/f converter
4225
- Front programmable
- Input: NAMUR, NPN, PNP, Tacho, TTL & S0
- Output: Programmable bipolar mA / V, frequency or relay
- Universal power supply 21.6...253 VAC / 19.2...300 VDC
Functional highlights
- Measures frequencies up to 100 kHz.
- Active and passive current output ±23 mA / 0...23 mA.
- Buffered voltage output ±10 VDC.
- Linearization: Linear or square root function.
- 2-point process calibration.
- Programmable trigger levels -0.05…6.5 V.
- Programmable sensor supply 5…17 V.
- NAMUR sensor error detection.
- Advanced configurable input limits for increased safety.
- Digital output: NPN & PNP; 0...100 kHz with programmable logic level 5…24 V.
- Output relay with windows, setpoint and latch functionality.
- Simulation of process value during commissioning and maintenance.
- All terminals are over-voltage protected (24 VDC), polarity protected and short-circuit protected.
Technical highlights
- Accuracy < 0.06% / span.
- Temperature coefficient 0.006% / °C.
- Response time < 30 ms.
- 2.3 kVAC, 3-port galvanic isolation.
- NAMUR NE21 and NE43.
Programming
- Configuration, monitoring and diagnostics using the PR 4500 detachable communication interfaces. Product-specific functionality includes communication via Modbus and Bluetooth using our PR Process Supervisor (PPS) application, available for iOS and Android.
- All programming can be password protected.
- Scrolling help text in 7 languages.
Mounting
- Units can be mounted side by side, horizontally and vertically, without air gap on a standard DIN rail – even at 60°C ambient temperature.
Data sheet & Manuals
Data sheet
- 4225.pdf
- Latest version
Manuals
- 4225V100_UK.pdf
- Latest version
Manuals in Russian
- 4225V100_RU.pdf
- Latest version
Supplementary documentation
EU Declaration of Conformity
- 4225DoC_EU_100_UK.pdf
- Latest version
UKCA Declaration of Conformity
- 4225DoC_UKCA_100_UK.pdf
- Latest version
Modbus configuration manual
- 4225_MCM_100.pdf
- Latest version
EMC data
- 4225_EMC_data.pdf
- Latest version
Safety note
Approvals & Certificates
Environmental Conditions
Operating temperature | -20°C to +60°C |
Storage temperature | -20°C to +85°C |
Calibration temperature | 20...28°C |
Relative humidity | < 95% RH (non-cond.) |
Protection degree | IP20 |
Mechanical specifications
Dimensions (HxWxD) | 109 x 23.5 x 104 mm |
Dimensions (HxWxD) w/ 4501/451x | 109 x 23.5 x 116 / 131 mm |
Weight approx. | 160 / 165 / 150 g (A / B / C) |
DIN rail type | DIN EN 60715/35 mm |
Wire size | 0.13...2.08 mm2 AWG 26...14 stranded wire |
Screw terminal torque | 0.5 Nm |
Common specifications
Supply |
|
Supply voltage, universal | 21.6...253 VAC, 50...60 Hz or 19.2...300 VDC |
Fuse | 400 mA SB / 250 VAC |
Max. required power | ≤ 2.5 W |
Max. power dissipation | ≤ 2.0 W |
Isolation voltage |
|
Test voltage | 2.3 kVAC |
Input to any (working) | 250 VAC (reinforced) |
Relay to relay (working) | < 115 VAC (reinforced) |
Relay to analog (working) | > 115 VAC (basic) |
NPN to analog (working) | Isolated > 50 VDC |
Push-Pull / PNP to analog (working) | Shared ground with analog output |
Response time |
|
Response time (0...90%, 100...10%) | ≤ 30 ms |
Auxiliary supplies |
|
Sensor supply limitation (terminal 44) | 20 mA, 5…17 V |
Programming | PR 4500 communication interfaces |
Signal dynamics, output | 18 bit |
Signal / noise ratio | > 60 dB |
Accuracy | See manual for details |
EMC immunity influence | < ±0.5% of span |
Extended EMC immunity: NAMUR NE21, A criterion, burst | < ±1% of span |
Input specifications
Frequency input |
|
Frequency range | 0.001 Hz to 100 kHz |
Time range, time function | 10 μs to 999.9 s |
Max. frequency / min. pulse width, with input filter ON | 75 Hz / 8 ms |
Sensor specifications |
|
NAMUR, trig-level LOW / HIGH | ≤ 1.2 / ≥ 2.1 mA |
Tacho, trig-level LOW / HIGH | ≤ -50 mV / ≥ +50 mV |
NPN / PNP, trig-level LOW / HIGH | ≤ 4.0 V / ≥ 7.0 V |
TTL, trig-level LOW / HIGH | ≤ 0.8 V / ≥ 2.0 V |
S0, trig-level LOW / HIGH | ≤ 2.2 mA / ≥ 9.0 mA |
Special voltage / current input |
|
User-programmable trig-levels |
-0.05...6.50 V
0.0...10.0 mA |
Output specifications
Current output |
|
Signal range |
-23...+23 mA (bipolar)
0...23 mA (unipolar) |
Programmable standard ranges | 0...20, 4...20, S4-20, ±10 mA, ±20 mA |
Load (@ current output) | ≤ 600 Ω |
Load stability | ≤ 0.001% of span / 100 Ω |
Response time, programmable | 0.0...60.0 s |
Sensor error indication | 0 / 3.5 / 23 mA / none |
Current limit | ≤ 28 mA |
Buffered voltage output |
|
Signal range | ± 11.5 V |
Programmable standard ranges | 0…5, 1…5, 0...10, 2…10, ± 5, ± 10 VDC |
Load, min. | > 2 kΩ |
Response time, programmable | 0.0...60.0 s |
Relay output |
|
Relay functions | Setpoint, Window, Sensor error, Latch, Power and Off |
Hysteresis | 0...100% |
ON and OFF delay | 0...3600 s |
Sensor error reaction | Break / Make / Hold |
Max. voltage | 250 VAC / VDC |
Max. current | 2 A |
Max. AC power | 500 VA |
Frequency output |
|
Frequency range | 0.001 Hz...100 kHz |
Prog. pulse time (f ≤ 500 Hz) | 1…1000 ms |
Pulse time > 500 Hz | Fixed 50% |
NPN / PNP / Push-Pull output |
|
Isink max. | 130 mA |
Voltage drop 130 mA | < 1.5 VDC |
Ext. voltage (terminal 24) max. | 30 VDC |
*Isource max. | 30 mA |
Vout | 24 VDC ± 10% |
Voltage | 5…24 VDC |
Observed authority requirements
EMC | 2014/30/EU & UK SI 2016/1091 |
LVD | 2014/35/EU & UK SI 2016/1101 |
RoHS | 2011/65/EU & UK SI 2012/3032 |
Approvals
c UL us, UL 508 | E248256 |

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