Four digit reading digital indicator for monitoring the signal from current, voltage or millivolt output sensors with settable alarms for switching equipment on/off at predetermined levels such as fans, pumps or valves.
Product Parameters
- Display: Red LED with 4 or 6 digits
- Input Signal: Single channel 4-20mA, 0-20mA, 0-5V, 1-5V, 0-10V, 2-10V or 0-60mV, 0-75mV, 0-100mV, 0-150mV
- Input Accuracy: 0.25% FS + 1 digit
- Alarms: Optional 2 or 4 relays or open collector
- Configuration: Front panel keypad
- Power Supply: 85 to 260 Vac/dc, 19 to 50 Vdc or 16 to35Vac
- Environmental Protection: IP40 front panel, IP20 rear panel
- Dimensions: 1/8DIN front fascia, 96 x 48 x 100 mm
- Special Features: RS485, Modbus RTU digital communications, analogue output configurable from 0-24mA
- Special Options: 6 digit display, IP65 front panel frame, green LED
Product Description
AC mains or low ac/dc voltage powered digital indicator with inputs for 4 to 20mA, 0 to 20mA, 0 to 5V, 1 to 5V, 0 to 10V, 2 to 10V or millivolts. The SRP-94 is fullly configurable for any type sensor with an analogue output and the large LED digital display can be scaled to indicate any engineering unit which fits within a 4 or 6 digit display resolution.
For switching on and off control equipment the SRP 94 is equipped with up to 4 relay alarms for mains high voltage switching or solid state open collector type switching for lower rated dc voltage circuits.
As standard the SRP94 is fitted with a RS485 interface to allow the transmission of data back to a digital process control system. There is also the option for a current loop output, rangeable from 0-24mA to output an analogue signal proportional to the measurement reading.
Product Applications
Start/Stop water level process pumps
Monitor water level by connecting a current or voltage output water level sensor and use the built-in optional alarm contact relays to start and stop process pumps.
- SKU ID: s1-srp94-0004
- Part No: SRP-94-1841-1-4-011
- Input: Milliamps (mA) or Volts (V)
- Outputs: Relay x4 (41)
- Power Supply Input: 85-260V ac/dc (4)
- Optional Extras: IP65 Front Panel Frame (01)
Product Help
Volume of non-linear tank contents
I am measuring a horizontal disc end tank in litres. Can this meter display the volume of the tank which is not linear compared to the level reading from the sensor?
Yes the SRP-94 includes parameters for cylindrical tanks with or without conical shaped ends. You can set the height/length of each conical end, and height/length along with the diameter of the cylindrical body. Then the firmware will do the math and convert the tank level sensor reading to a volume of tank contents measurement.
Also it is possible to add up to 21 linearisation points instead if the tank shape does not conform to one of the options above.
Displaying oil level in kilograms
We want to install a fuel oil tank level gauge using a hydrostatic pressure sensor and this indicator, but the client wants to display the contents of the tank in kg rather than a level indication, is it possible to scale this into the indicator?
You can configure the display to display in any units as long as they are linearly proportional to pressure measured. So if the input was a 4-20mA signal and the maximum weight was 750 kg, then you would simply define the lower range limit as 0.00 and the upper range limit as 75.00.
Alarm setting when pressure drops to zero
We will be reading an incoming signal of 4-20ma from a pressure transducer, and need an alarm setting output when the pressure drops to zero?
The SRP 94 has a signal channel input which can be configured to power and accept a 4-20mA signal, and has the option for 2 alarm relays, for which one relay can be used to switch an external output on & off when the pressure drops to zero.
- SKU ID: s1-srp94-0003
- Part No: SRP-94-1821-1-3-001
- Input: Milliamps (mA) or Volts (V)
- Outputs: Relay x2 (21)
- Power Supply Input: 24V ac/dc (3)
Switch off Oxygen supply solenoid valve
We need a unit to monitor pressure from an O2 pressure sensor and switch off a solenoid valve at the preset pressure (1000 – 2000 psi). All powered by AC mains.
The SRP94 has the option for 2 x voltage free contact relays which can be programmed to open/close at any setpoint over the measurement range. A millamp or voltage output sensor can be used with the SRP94 and the display can be scaled in any units.
- SKU ID: s1-srp94-0002
- Part No: SRP-94-1821-1-4-001
- Input: Milliamps (mA) or Volts (V)
- Outputs: Relay x2 (21)
- Power Supply Input: 85-260V ac/dc (4)
Pump low pressure switch
I require to switch a pump on at a low pressure set point and switch off at a value above that set point or at set point 2. The transducer is 4-20mA with a 0-50bar range which can be displayed in either psi or bar. Would the SRP94 be able to do this?
The SRP-94 has the option for 2 relays, but you only need to use 1 relay to control the pump, by entering the setpoint and then entering a hysteresis value to define the gap between the ON & OFF setpoint values.
Retransmit 4-20mA with offset
Can the SRP94 display the output from a 4 to 20mA pressure transmitter, scaled in engineering units of mmH2O with the ability to add an offset to the displayed reading and re-transmit the adjusted value via a 4 to 20mA output to another instrument?
Yes, the SRP94 has a retransmission analogue output option which can be configured with any offset and span. For example if your pressure transmitter has the following scaling:
- 0 mmH2O = 4mA
- 1000 mmH2O = 20mA
You could then scale the readout and 4-20mA re-transmission output as follows:
- 200 mmH2O = 4mA
- 1200 mmH2O = 20mA
Display reading for 50 psia, 0-5Vdc pressure transducer
I have 0-50 psia pressure transducers with a 0-5 VDC output and I need an LED display that will show the current reading. Which SRP 94 configuration would you suggest?
This specification will be compatible with the pressure transducer you have:
- SKU ID: s1-srp94-0001
- Part No: SRP-94-1800-0-1-3-001
- Input: Milliamps (mA) or Volts (V)
- Outputs: No outputs (00)
- Power Supply Input: 24V ac/dc (3)
Related Documents
Specification data sheet
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