MG-5000-A-MD-R

SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview Product Description The MediaGauge™ MG-MD is a multi-functional digital pressure gauge consisting of a media isolated piezoresistive pressure sensing element, signal conditioning circuitry for temperature and calibration compensation, a 304L stainless steel pressure port and a LCD back lit display. The MG-MD digital pressure gauge has an accuracy of ± 0.25 % full scale for 75 to 3000 psi. The MediaGauge™ MG-MD digital pressure gauge is powered by an external 8 – 30 Vdc external power supply and comes standard with a wide variety of functions – multiple pressure unit display readings (PSI, BAR or MPA units); memory storage of maximum peak pressure reading; MediaGauge™ Model MG-MD with 2 meter cable. zero adjustment; a 4-20 mA current output along with a limit switch (NPN transistor) to interface to monitoring and control systems. Product Features • Superb Accuracy: ± 0.25% Full Scale • Pressure Ranges: 5, 15, 50, 75, 100, 200, 300, 500, 750, 1000, 1500, 2000, 3000, 5000 PSI robust digital pressure gauges measure pressures from • 5 PSI to 5000 PSI and are ideal for a variety of industrial and commercial applications such as process control, Keypad Operated Functions: Auto zero; peak hold and high and low pressure set points • Monitoring and control outputs: 4-20 mA output and a limit switch (NPN transistor output) controlled by the high and low keypad programmable pressure set points. • Operating Temperature: -10°C to 60°C • Storage Temperature: -20°C to 85°C The MediaGauge™ MG-MD is made of all laser-welded 304L & 316L stainless steel for optimal media isolation and usage in a wide variety of media. These compact 3 inch, refrigeration, compressors, pumps, hydraulics, pneumatics and waste water. The MediaGauge™ MG-MD digital pressure gauge has better accuracy, longer life and standard multiple functions which make it a better choice than mechanical pressure gauges. SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com Copyright October 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 1 RoHS SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview The piezoresistive sensing element contains an oil-filled micro-machined 316L stainless steel convoluted diaphragm • Typical Applications: General Purpose, Test, Process Control; MRO, Water, Compressors, Refrigeration; Fuel Cells; Pumps; Hydraulics; Spraying Systems; Pneumatics; Flow; Robotics; Agriculture; Hydrogen Storage and a silicon crystal semiconductor. The silicon crystal sensor is mounted on a 304L stainless steel housing and laser welded to the diaphragm. Optimal media isolation is achieved when the media’s pressure acts directly on the • NEMA 4X Rating 316L stainless steel diaphragm and is then transferred through the oil to the silicon sensor. • NIST traceable certificates available Strain gauges (resistive elements) in the silicon are used in a Wheatstone Bridge circuit. When the media’s pressure is • Chemical Compatibilities: Any gas or liquid compatible with 304L Stainless Steel. For example, Motor Oil, Diesel, Hydraulic fluid, brake fluid, water, waste water, Hydrogen, Nitrogen, and Air. applied, the resistivity of the strain gauges changes proportional to the pressure applied. One leg of the bridge measures the input pressures port. The other leg of the • Multiple Pressure Units: PSI, BAR, MPA (kg/cm²) bridge is connected to the reference port (vacuum pressure 0 PSI) the input pressure port is compared to. • Compact, Robust Package: 3 inches with black ABS Thermoplastic case Since piezoresistive pressure sensors are sensitive to changes in temperature, the MediaGauge™ MD-MG digital pressure gauge uses signal conditioning to compensate for Measurement Technology In general, pressure measurement technology translates a temperature and calibration prior to outputting the LCD signal. The output signal is then converted into one of 3 force from an induced pressure into an electrical quantity. In digital pressure gauges, the electrical quantity is then user selectable forms (select units with the UNIT/SET button): translated into pressure units and digitally displayed. 1) PSI The SSI’s MediaGauge™ MG-MD digital pressure gauge 2) BAR consists of a 304L stainless steel input pressure port; a piezoresistive pressure sensing element; signal conditioning 3) MPA (kg/cm²) circuitry for temperature and calibration compensation; a LCD that displays the pressure measured in either PSI, BAR or MPA (kg/cm²) units; a 4-20 mA output signal and a The MediaGauge™ MG-MD digital pressure gauge will display the pressure reading after the UNIT/SET button is limit switch (NPN transistor output). depressed. The pressure measurement reading is updated 3 times per second. SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com Copyright October 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 2 RoHS SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview Example Using High & Low Set Points Limit Switch Operation The MediaGauge™ MG-MD also has two keypad programmable pressure set points – a low limit set point and high limit set point. These set points control the limit switch (NPN transistor output). VCC To understand the high and low pressure set points functioning, let’s look at a typical application where the MediaGauge™ MG-MD in used in a monitor and control system. 1 2 Supply Source (White) 4 - 20 mA OUT (Blue) 3 4 In the graph shown here, you can see how the user can program the high and low set points to control when the relay would turn on and off. COM VCC Meter Input pressure values below the low limit set point or higher than the high limit set point will result in a limit switch output (Brown Wire) of 0 Vdc. Switch Output (Brown) Ground (Black) RELAY NO NC Input pressure values within the control set point limits (between the low and high set point values) will result in a limit switch output that follows the external power source. MediaGauge ™ 4 Pin Mini DIN In the example shown above, the MediaGauge MG-MD is Note: The 4-20 mA output (Blue Wire) is proportional to the input pressure and operates independent of these low and attached to an external power supply, a current meter and a relay. We will assume the low set point has been set to 100 high set points. psi and the high set point has been set to 375 psi. SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com Copyright October 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 3 RoHS SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview MediaGauge™ MG-MD Panel To display the pressure reading in a different pressure unit: Press the UNIT/SET button until the arrow in the LCD points MediaGauge™ MG-MD panel has a LCD display and three ; UNIT/SET; multi-functional buttons: to the pressure units desired. To check the value of the low pressure setting: Press and release the button, the low pressure set point will be displayed for 30 seconds. To check the value of the high pressure setting: Press and button, the high pressure set point will be release the displayed for 30 seconds. To see the maximum peak pressure the unit has measured: Press and hold down the button for 3 seconds. The maximum peak pressure value will be displayed and will blink on the screen. To reset the maximum peak pressure: Press and hold down the button for 3 seconds, and the peak hold value will reset. To return to the current pressure reading: Press and hold the X button for 3 seconds and the gauge will be back to the measurement mode, the current pressure measurement will be displayed and will not blink. To reference your MediaGauge™ digital pressure gauge to the input port: Press and hold down the button and the button at the same time for 3 seconds. For example, if you have 20 psi on the display and then you press and hold button simultaneously for 3 down the button and the seconds, the display will show 0.0 psi. A measurement of 30 psi would then read as 10 psi on the display. To power on the unit: There is no ON/OFF button on the MediaGauge™ MG-MD model. The MG-MD unit is powered on and off via the external 12V supply voltage source. When the external supply voltage is between 8 - 30 Vdc, the LCD will be backlit and will continuously display the To reset the MediaGauge™ digital pressure gauge: Make sure the input port is either disconnected or connected to a 0 psi input. Press and hold down the button and the S button at the same time for 3 seconds. pressure measurements. SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com Copyright October 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 4 RoHS SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview Electrical Interface To set the High or Low pressure set points: Press and hold down the UNIT/SET button for 3 seconds. The MediaGauge™ MG-MD will go into the pressure setting mode. MediaGauge™ MG-MD harness connections: 1) The screen shows on the top, left hand side indicating high pressure setting, and the first digit will be flashing. White wire: Power Lead for supply input (12 Vdc) Black wire: Return Lead 2) Set the first digit value by pressing the Button (select from 0 to 9). Then press the Button, which shifts to the second digit. Again use the Button to select 0 thru 9 followed by the Button to complete the third and forth digits. Brown wire: Limit Switch output (NPN Transistor output) Blue Wire: 4-20 mA output for meter. (Must be loop grounded with black wire) 3) After all 4 digits of the high pressure settings are done press the Button one more time, the on the top, left hand side screen will show indicating low pressure setting. Repeat steps 1 and 2 above to set the 4 digits of the low pressure settings. Typical Wiring Interface This is a description of an application to interface the MediaGauge™ MG-MD to a monitoring and control system utilizing the limit switch output to control a relay and monitor 4) After all 4 digits of the low pressure settings are done press the Button one more time, the screen will show “Load”, indicating your pressure settings have been saved into memory. the output current. The relay will turn on and off based upon the high and low pressure set points the user programs into the MediaGauge™ MG-MD digital pressure gauge. 5) To make sure that the settings are correct, you can press the Button to check the value of the low Button to check pressure setting and press the the value of the high pressure setting. 1) Mount the MediaGauge™ MG-MD digital pressure gauge on a suitable (1/4” NPT) female fitting. Use Teflon tape or pipe dope to seal the threads. . Do not over tighten. Torque to 150 in lbs +/- 1 in lb. 2) Connect the supplied mating harness with Din connector to the mating connector on the back of the MediaGauge™ MG-MD digital pressure gauge. 3) Program the MediaGauge™ digital pressure gauge with your low and high pressure set points per the instructions described previously. SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com Copyright October 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 5 RoHS SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview Electrical Specifications 4) Connect the brown wire to one side of the relay. Connect the other side of the relay to ground. Refer to Figure 1. 5) Supply Voltage 8 - 30 Vdc supply Response Time < 1 ms Accuracy (75-3000 PSI) ± 0.25 % FS Thermal Error typ. (75-3000 PSI) ± 0.25 % FS Total Error (75-3000 PSI) ± 0.25 % FS 6) When monitoring the 4-20 mA current output with a voltage meter, connect the 4-20mA output Accuracy (15-50 PSI) ± 0.50 % FS to an appropriate resistive load selected based on the value of your supply voltage. See Figure 2. Thermal Error Typ. (15-50 PSI) ± 0.50 % FS Total Error (15-50 PSI) ± 0.50 % FS Accuracy (5 PSI) ± 1.0 % FS Thermal Error Typ. (5 PSI) ± 1.0 % FS Total Error (5 PSI) ± 1.0 % FS Stability (Typical) < 0.25% Full Scale/Year When monitoring the 4-20 mA current output with a current meter, Connect the current meter in series with the 4-20 mA output. Connect the 4-20mA output (Blue Wire) to the + terminal of the current meter. Connect the – terminal of the current meter to ground. Connect the 4-20 mA output (Blue Wire) to one end of the resistive load. Connect the other end of the resistive load to ground. Note: The 4-20mA (Blue Wire) must be connected directly to ground when not being used for monitoring purposes. SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com Copyright October 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 6 RoHS SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview Electrical Specifications (cont). Tested Conditions LCD Resolution (5 PSI) X.000 Humidity 250 Hours (40°C and 90% to 95% R.H. LCD Resolution (15 to 75 PSI) XX.00 Pressure/Temperature > 1.8 million Cycles (0 to FS @ 8Hz and Cycles -20° to 85°C) LCD Resolution (100 to 750 PSI) XXX.0 Thermal Shock 250 Cycles (85 to -20°C. 0.5 hr soaks at Proof Pressure 3 X Full Scale Burst Pressure 10X Full Scale Zero Pressure Offset 4 mA Full Scale Output 20 mA Operating Temperature Range -10° to 60°C (14° to 140°F) Storage Temperature Range -20° to 85°C (-4°to 185°F) temperature Vibration sinusoidal in 3 axes) SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com 144 Hours (100 to 2000 Hz, 20g Copyright October 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 7 RoHS SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview COM VCC Supply Source 1 (White) 4 - 20 mA OUT 2 (Blue) Meter Switch Output 3 (Brown) RELAY Ground (Black) 4 NO NC MediaGauge™ 4 Pin Mini DIN Figure 1. Typical MediaGauge™ MG-MD Digital Pressure Gauge Application Wiring Diagram Maximum Load Resistance Vs. Supply Voltage Supply Voltage (V) 20 18 16 14 12 10 8 6 0 100 200 300 400 500 600 Maximum Load Resistance (Ohms) Figure 2. Load Resistance Values for 4-20mA output SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com Copyright October, 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 8 RoHS SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview Mating Connector and 2 meters of cable included with MD version MediaGauge™ with 22mm Hex and 1/4" - 18 NPT Process Connection SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com Copyright October, 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 9 RoHS SSI Technologies – Application Note PS-AN7 MediaGauge™ (Model MG-MD) Digital Pressure Gauge Product Overview Digital Pressure Gauge Ordering System The following explains SSI’s MediaGauge™ Digital Pressure Gauge order number sequence. MG - Example Product Family Pressure Ranges • MG • • • • • • • • • • • • • • 5 15 50 75 100 200 300 500 750 1000 1500 2000 3000 500 - A - MD Port Configuration • • Hex A 22mm B 22mm Connector Port 1/4 - 18 NPT 1/8 – 27 NPT • MD 4 Pin Mini Din with 4-20 mA output and 2 programmable set points (Port B is valid only on MG models and has a 6 week lead time) 5000 Rubber Boot: Order P/N 14405.1 for Model MG SSI TECHNOLOGIES, INC. Controls Division 1309 Plainfield Ave. Janesville, WI 53545-0450 Phone: (608)758-1500 Fax: (608)758-2491 www.ssitechnologies.com Copyright October, 17, 2012 SSI Technologies Inc. All Rights Reserved Revision 4 10 RoHS