Overview
The 415 Steam and Gas Flow Computer incorporates the following compensation equations for gas and vapours:
Ideal Gas Law using 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 which 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.
RTD or 4-20mA temperature Inputs
The backlit alphanumeric display simplifies programming and provides 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.
The instrument is available with direct RTD input (415R) or with 4-20mA temperature input (415A). Both accept a 4-20mA pressure input.
Wide range of flowmeter inputs
Inputs from a wide range of flowmeters are accepted, including vortex, turbine, orifice plate, averaging pitot tubes, wedges and target flowmeters. Also, 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.
Features at a glance
- 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
415 Gas & Steam Flow Computer
A scaled output, suitable for driving remote totalisers, is a standard feature. Options include an isolated 4-20mA retransmission, high and low flow alarms and an RS232/422 output which will operate on either the mass, corrected volume or energy outputs, depending on which value is programmed as the default display.
RS232/422 output enables data logger operation
The RS232/422 option will output all parameters displayed and has the unique ability to print flow rates and totals at programmable time intervals. This enables the 415 to function as a data logger when used in conjunction with a printer or other storage device.
Protocols are provided for standard roll and column printers as well as for computer interfaces and a real time clock provides time and date. The totals can be programmed to reset via the front panel, after each print or at 24:00 hours.
Flowmeter Inputs
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.
Parameters Displayed
Information is displayed in a number of windows which can be selected using the DISPLAY key.
General
Flow rate of the mass, corrected volume or energy is displayed in units per day, hour, minute or second.
Total of the mass, corrected volume or energy. A reset key on the front panel enables totals to be reset, or the key can be disabled during setup. Totals are displayed with 8 digits.
Gas Flow
Corrected volume at base conditions (m³ or ft³)
Mass (kg or lbs) Temperature (°C or °F)
Pressure (kPa or psi) in absolute or gauge
Compressibility Z, for general gases
Super compressibility Fpv for natural gas
Steam Flow
Mass (kg or lbs)
Energy (MJ or Btu x 1000)
Temperature (°C or °F)
Pressure (kPa or psi) in absolute or gauge
Specific weight in dm3/kg
Specific enthalpy in kJ/kg
Specifications
General
Display
2 line x 20 character (5.5mm high) alphanumeric backlit LCD
Keypad
Sealed membrane keypad with four keys
Transducer Supply
8-24V dc field adjustable, 65mA max
Power Requirements
dc Supply:
14 to 28V dc, 300mA typical (no options)
ac Supply:
ac mains set internally to 95-135V ac or 190-260V ac
Operating Temperature
0 to 55°C
Facia Sealing
IP65 (Nema 4X) watertight
Approvals
Electrical
ETL (US) approved to UL508 and CSA
Interference
CE Compliance
Enclosure
CENELEC, FM, CSA and SAA approved enclosures available for hazardous areas
Frequency Input
Range
Minimum:
0.25Hz on Rate, 0Hz on Total
Maximum:
10KHz
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
Pressure:
0 kPa abs (0 psia) to 100,000 kPa abs (10,000 psia)
Temperature:
-273°C (-459.4°F) to 1200°C (2192°F)
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 non-linearity 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
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 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
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.)
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 Ouput Option
Function
High and low flow rate alarms 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
Corrected Volume:
M³ or ft³
Mass:
kg or lbs
Temperature Range
-273°C (-450°F) to 800°C (1472°F)
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-Kwong¹ equation
Temperature Range
-273°C (-450°F) to 800°C (1472°F) (RTD has a more limited range)
Pressure Range
0 kPa abs (0 psia) to 100,000 kPa abs (10,000 psia)
Important: Specifications are subject to change without notice.
Dimensional Drawing
Terminal Descriptions
| Terminals Common to all models | |
|---|---|
| No. | |
| 1 | Calibration |
| 2 | Switch Common |
| 11 | DC Power Out |
| 12 | DC Ground |
| 13 | DC Power In |
| No. | 415A | 415R |
|---|---|---|
| 3 | Flow 1 (4-20mA) | Flow 1 (4-20mA) |
| 4 | Temp. (4-20mA) | PT100 (+) |
| 5 | Reset Switch | PT100 Signal (+) |
| 6 | Display Switch | PT100 Signal (-) |
| 7 | Pressure (4-20mA) | Pressure (4-20mA) |
| 8 | Flow Common | Flow Common |
| 9 | Flow Pulse Input | Flow Pulse Input |
| 10 | Pulse Out | Pulse Out |
| 14 | Flow 2 (4-20mA) | PT100 (-) |
| RS232/422 Option (All Models) | |
|---|---|
| No. | |
| 20 | RS232 Signal Ground |
| 21 | RS232 Data In |
| 22 | RS232 Data Out |
| 23 | RS422 (-) Data Out |
| 24 | RS422 (+) Data Out |
| 25 | RS422 (-) Data In |
| 26 | RS422 (+) Data In |
| 27 | RS232 CTS |
| Isolated 4-20mA Output Option | |
|---|---|
| No. | |
| 20 | Not Used |
| 21 | 0 Volts |
| 22 | 0-10 Volts Out |
| 23 | -12 Volts |
| 24 | I (-) |
| 25 | I (+) |
| 26 | +15 Volts |
| 27 | Not Used |
| High & Low Relay Alarm Option | |
|---|---|
| No. | |
| 31 | High - Normally Open |
| 32 | High - Normally Closed |
| 33 | High - Common |
| 34 | Low - Normally Open |
| 35 | Low - Normally Closed |
| 36 | Low - Common |
Ordering Information
When specifying please indicate model(s) required using the following method.
