Contrec's 415 Steam and Gas Flow Computer incorporates the following compensation equations for gas and vapours:
Ideal Gas Law uses temperature and pressure correction, but where compressibility correction is not required.
General Gases where compressibility is calculated using the Redlich-Kwong¹ state equation. This equation is suitable for gases that have known properties, and information on common industrial gases is provided in the operating manual.
Natural Gas using the NX-19² equation to calculate super compressibility.
Steam Equations for both saturated and superheated steam. Mass and energy flow rates are calculated using standard equations to determine the specific weight and enthalpy of steam.
Programming is simplified with the 415's backlit alphanumeric display providing a clear indication of all parameters, as well as engineering units. The 415 is fully programmable and all operating parameters are entered via the front panel keypad. This instrument is available with direct RTD input (415R) or with 4-20mA temperature input (415A). Both accept a 4-20mA pressure input. Inputs from a wide range of flowmeters are accepted, including vortex, turbine, orifice plate, averaging pitot tubes, wedges, and target flowmeters. Where two differential pressure transmitters are used across an orifice or similar device, to increase the measured flow range, both DP transmitter inputs are accepted and scaled separately with automatic crossover.
- Displays mass flow, corrected volume, and energy flow
- Accepts 4-20mA and frequency flow inputs
- Temperature and pressure compensation
- Dual-ranged DP transmitter inputs
- Operates from 14-28V dc or ac mains
- Simplified programming
- Data logging output
| GENERAL SPECIFICATIONS | Display | 2 line x 20 characters (5.5mm high) alphanumeric backlit LCD. |
| Keypad | Sealed membrane keypad with four keys. | |
| Power |
|
|
| Temperature |
0 to 55°C |
|
| Sealing | IP65 (Nema 4X) watertight | |
| APPROVALS | Electrical | ETL (US) approved to UL508 and CSA |
| Interface | CE Compliance | |
| Enclosure | CENELEC, FM, CSA, and SAA-approved enclosures available for hazardous areas | |
| Frequency Input | Range |
|
| Input Circuits | Accepts most sine, logic, and proximity switch inputs | |
| K-factor Range | 0.1000 to 999,999 | |
| Non-Linear Correction | Up to 10 correction points | |
| 4-20mA Inputs | Input Types | Flow (2 ranges), pressure, and temperature |
| Input Impedance | 250 ohms | |
| Measurement Range |
|
|
| Span (flow) | 999,999 | |
| Accuracy | 0.05% | |
| Circuit | 250 ohm resistors connected to a common signal ground (current sinking) | |
| Non-Linear Correction | A 20 point curve can be applied to the flow input | |
| RTD Input (Model 415R) | Type | Platinum PT100 |
| Range | -100°C (-l48°F) to 200°C (392°F). (Note a wider temperature range can be handled via a 4-20mA input.) | |
| Accuracy | 0.1°C | |
| Linearity | The nonlinearity of the RTD is internally compensated for | |
| Pressure Input | Type | Absolute or gauge |
| Span | Absolute or gauge pressure is programmable at 4mA and 20mA | |
| Atmospheric | If a gauge pressure sensor is used, the atmospheric pressure is programmable | |
| Pulse Output | Pulse Width | l0ms (negative going pulse). |
| Duty Cycle | 49 pulses/sec max | |
| Output | Open collector transistor will sink l00mA max. (Note: Suitable for driving remote counters or PLC's.) | |
| RS232/422 Option | Type | Both RS232 and RS422 are provided. (Note: When using the RS422, multi-point communication (RS485) can be implemented with up to 32 instruments connected to a common bus.) |
| Function | The printer and computer protocols are fully programmable. | |
| Printer | A print is initiated on each reset or at a programmable time interval. (Note: Protocols are provided for roll & column printers.) | |
| Computer | An ASCII based protocol enables all displayed parameters to be read and the totals to be reset | |
| Baud rate | 300 to 9600 | |
| Data Bits | 7 or 8 | |
| Parity | None, Odd, or Even | |
| Data Logging | Output is generated at intervals of once a minute to once every 24 hours. The totals can be programmed to reset on each print or at 24:00 hours. | |
| Time | A real-time clock is provided to give time and date on each output | |
| 4-20mA Output Option | Function | The outputs flow rate in mass, corrected volume or energy. The 4 and 20mA points can be programmed to provide a fully scaled output. |
| Resolution | 10 bits | |
| Accuracy | Better than 0.1% | |
| Maximum Load | 500 ohms internally powered. 950 ohms from external 24V dc | |
| Isolation | Output is isolated | |
| Relay Output Option | Function | High and low flow rate alarms are based on the flow rate in mass, corrected volume, or energy. |
| Maximum Ratings |
Power: 250VA.
Voltage: 250V ac, 30V dc.
Current: 5 Amps.
|
|
| Ideal Gas |
Display |
|
| Temp Range | -273°C to 800°C | |
| Pressure Range | 0 kPa abs (0 psia) to 100,000 kPa abs (10,000 psia) | |
| General Gas | Gases | Handles most gases for which the critical temperature, pressure, and specific gravity are known |
| Compressibility | Calculated using the Redlich-Kwong equation | |
| Temp Range | -273°C to 800°C (RTD has a more limited range) | |
| Pressure Range | 0 kPa abs (0 psia) to 100,000 kPa abs (10,000 psia) | |
| Natural Gas | Calculations | Uses NX-19 equation to calculate super compressibility FPV |
| Temp Range | -40°C (-40°F) to 115°C (240°F) | |
| Pressure Range | 101.325 kPa abs (14.69 psia) to 34,380 kPa abs (4985 psia). | |
| Specific Gravity Range | 0.554 to 1.000 | |
| Carbon Dioxide | 0 to 15% mole | |
| Nitrogen | 0 to 15% mole | |
| Steam | Calculations | Uses 1967 IFC Formulation (ASME) equations to calculate specific weight and enthalpy of steam. |
| Types | Saturated and Superheated. | |
| Temp Range | 20°C to 800°C (RTD has a more limited range.) | |
| Pressure Range | 1 kPa abs (1 psia) to 100,000 kPa abs (10,000 psia). | |
| Saturated Steam | When measuring saturated steam, it is possible to omit either the pressure or temperature sensor since, on the saturated line, there is a corresponding pressure for all temperatures. |
Important: Specifications are subject to change without notice.
The 415 accepts most flowmeter inputs including:
- Frequency producing flowmeters such as vortex, turbine or positive displacement.
- Volumetric flowmeters with 4-20mA outputs such as vortex or turbines with a frequency to current converter on the output.
- Differential Pressure devices such as orifice plates, averaging pitot tubes, wedges, cones, elbows, or target flowmeters, where a square law relationship applies.
- Linear Differential Pressure devices where the 4-20mA output is directly proportional to the flow rate.
- Dual Range (Stacked) Differential Pressure Transmitters where two separately spanned transmitters are used across a common flow device such as an orifice (both square and linear inputs).
- Non-Linear Differential Pressure devices such as laminar flow tubes or VA meters. A 20 point correction curve can be programmed to compensate for any non-linearities in the flowmeter.
Information is displayed in a number of windows which can be selected using the DISPLAY key.
415 Steam and Gas Flow Computer Downloads
for the 415 Steam and Gas Flow Computer by Contrec
for the 415 Steam and Gas Flow Computer by Contrec