Installation and Maintenance Instructions for GC51 Rangeable Pressure Transmitter LOOK FOR THIS AGENCY MARK ON OUR PRODUCTS Version 6.03 5/11 © 2011 Ashcroft Inc. 250 East Main Street, Stratford, CT 06614 USA Tel: 203-378-8281, Fax: 203-385-0402 www.ashcroft.com All sales subject to standard terms and conditions of sale. I&M011-10159_Rev. C_6.
CONTENTS CAUTION ............................................................................................ PREFACE ............................................................................................ OVERVIEW .......................................................................................... FEATURES .......................................................................................... SPECIFICATION....................................................................................
WARNING! READ BEFORE INSTALLATION 1. GENERAL: A failure resulting in injury or damage may be caused by excessive overpressure, excessive vibration or pressure pulsation, excessive instrument temperature, corrosion of the pressure containing parts, or other misuse. Consult Ashcroft Inc., Stratford, Connecticut, USA before installing if there are any questions or concerns. 2.
1. 2. 3. PREFACE Thank you for purchasing the GC51 Rangeable Pressure Transmitter. In order to utilize this product safely please note the preceding warning comments. Refer to Ashcroft Bulletin GC-51 for product specifications and applicable operating conditions. OVERVIEW The GC51 is a 4-20ma loop powered (two-wire)pressure transmitter with display incorporating Ashcroft’s polysilicon thin film sensing element which provides high cycle life, excellent overpressure ratings, high stability and durability.
4. SPECIFICATION Item: Description A. Media / Wetted Parts: Fluids or gases compatible with 316SS and 17-4PH SS B. Overpressure (Proof): –1500 psi FS and below; 200% FS value –3000, 5000 psi; 150% FS value –7500 psi; 120% FS value C. Supply Voltage: 12-32 Vdc D. Output: 4 to 20mA dc (two wire, output range: 3.2 to 20.8mA dc) Response Time: 30 ms (with “0” filter setting) Resolution: 0.1%F.S., Load resistance: 500ohms max. E. Accuracy: ±0.25%F.S.
L. Pressure Connection: 1⁄4 NPT Female M. Enclosure: Material: Aluminum (die cast) Environmental Rating: IP65 / NEMA 4X N. Mounting: Pressure Port Location: Lower (bottom) Panel mounting: via bracket included Location: compliant with environmental ratings and where display does not get directs sunlight O. Electrical Termination: Cable Gland: Cable diameter 0.35 to 0.47˝ (9-12 mm) Terminal block: 14-22 AWG (strand or a solid wire) 1⁄2 NPT female conduit (optional) P.
5.2. Mounting Options Direct connection to pressure ports with suitable piping and / or pressure fitting or with bracket included for panel mounting. If using cable it is recommended that the cable exit downward. 5.3. Pressure Connection A. Only apply wrench to pressure port flats, DO NOT apply force to the housing. Clear tubing of any debris (metal filings etc) and unwanted fluids (oil etc). B.
Installation Drawings 4.1 2.76 2.36 2.76 3.15 .47 psi 1.06 4 - Ø .18 Mounting bracket holes 7. 2.3 WIRING Power supply requirements, 12 -32 Vdc, note installation recommendations below. 7.1 Cable / Wire Specifications Terminal Strip Cable Requirements SMKDSP1.5/2-5.08 Phoenix contac • Two core shielded cable • Cable outer diameter: 0.35 to 0.47˝ (9-12mm). Required for proper installation with cable gland option • Wire Gauge: 14-22 AWG (multi-strand or solid) 7.
• Wiring stripping instructions, remove cable jacket 2-3˝ and strip wires 0.25˝. Shield / drain wire should not be exposed at the pressure transmitter termination. • Remove cover and carefully remove the display to access the terminal strip, take care not to mishandle the display and associated electronics.
Power supply terminal block Turn with a screwdriver Wire LCD clips (4) Wire terminals Display board Display • After completing connections locate retaining clips in the appropriate notches and carefully place into the housing. Be sure that internal sensor ribbon cable does not cross the power supply lines just installed. • If using the Cable Gland be sure to properly tighten sealing grommet before applying any tension on the cable, the cable gland provides strain relief and environmental sealing.
Load Limitations 4-20mA Output Only Loop Resistance (V) 1020 1000 750 545 500 OPERATING REGION 250 0 0 10 12 20 24 30 32 LOOP SUPPLY VOLTAGE Vmin = 12V+[.
8. DISPLAY FUNCTIONS Test Terminals CH+ CH- GC51 (1) Measured Data (2) Pressure Unit Monitor PSI (3) Arbitrary Unit Monitor M (4) MODE key Designation 1. Measured Data Display 2. Pressure unit monitor 3. Arbitrary unit monitor 춧 4.MODE button MODE 5.DOWN button # 6.UP button $ (5) DOWN key (6) UP key Function Pressure, linear scaling value, hold value (max./ min), are displayed. When either indicator is ON, the display is reading in PSI.
9. MODE CHANGES • Measurement Mode (Section 11 for further detail) will be entered upon power-on. Setting Mode (Section 13 for further detail) is entered by pressing and holding the MODE button for more than 3 seconds. If there is no button operation for 10 minutes in the setting mode, it will shift back to the Measurement Mode automatically.
11. MEASUREMENT MODE The measurement mode includes pressure display mode and linear (scaling) display mode. 11.1 Filter (Damping) Set the filter before setting pressure display mode or linear (scaling) display mode. The filter is based on the moving average of the pressure data to decrease display “bounce” and to smooth the analog output due to system pressure fluctuations at the user’s discretion.
Select the filter of “8 times” Select the “Pressure display mode” Set output zero point as “10.0%F.S.” (10 psi) Set output span point as “90.0%F.S.” (90 psi) ⇒ Setting item ⇒ Setting item ⇒ Setting item ⇒ Setting item Setting Example 1: Pressure Display Mode Using a standard pressure range of 0 to 100 psi, the steps to change the display and analog output zero and span points to 10 and 90 psi respectively are as follows: First, set the Filter.
11.3 Linear Display Mode (Re-scaling arbitrary user defined units) This mode is used for display/analog output of the scaling value where the pressure is linearly converted to an arbitrary physical quantity (user defined, GC51 is supplied with display unit “PSI”). FURTHER DETAIL regarding menu and button sequence is shown in Section 14.2-14.3. A.
B. Analog Output The zero point (4mA) and span point (20mA) of the analog output can be set in the range of 10 to 110%F.S. of the maximum display span (between OFFSET and FULL SCALE).The span between the zero point and the span point in this analog output is the linear display span. Note: see page 24 for full menu.
For display mode, select “Linear display mode” ⇒ Setting item Set min. pressure P1 as “10 psi” ⇒ Setting item Set max. pressure P2 as “60 psi” ⇒ Setting item Set decimal point position of linear display as “two digit” ⇒ Setting item Set OFFSET of linear display as “0.00” ton ⇒ Setting item Set FULL SCALE of linear display as “5.00” ton ⇒ Setting item Set output zero point as “0.0%F.S.” (0.00ton) of max. display span ⇒ Setting item Set output span point as “100.0%F.S.” (5.00ton) of max.
11.4 Minimum / Maximum Display In Pressure Display Mode or Linear Display Mode the maximum and minimum values are captured into nonvolatile memory (EEPROM). The following steps describe how to display these values. A. Maximum Value In Measurement Mode (either pressure or linear indication mode), press UP $ button to display the maximum value. The letter “H” will follow the reading indicating this is the maximum value. Press the UP $ button again to return to Measurement Mode.
C. Minimum / Maximum Reset The Minimum / Maximum values can be reset when in either Minimum / Maximum display or Measurement Mode by holding the DOWN # button for more than three seconds, “cLr” will appear on the display for two seconds and the Minimum and Maximum values will be removed. Note: Values are maintained even if unit is powered OFF. Hold reset message clr • When first using unit be sure to Reset values to clear values in memory from the factory calibration process.
–5%F.S. or less • Span Over display 105%F.S. or more 005.0 105.0. . 12. ZERO ADJUSTMENT MODE When in Measurement Mode the zero reading can be adjusted. To adjust the zero reading be sure the pressure connection port (or the system to which it is connected) is open to atmosphere and hold the UP $ button for more than 3 seconds. This is not to be used for scaling of the output, refer to Section 11.2 and 11.3 for scaling function.
14. SETTING MODE The setting mode includes access to pressure display mode and linear display mode. In addition loop check (section 13.4) can be performed in each mode. 14.1 Setting Items for Pressure Display Mode (Re-scaling in “psi” units) Set the filter before setting the pressure setting mode Note: see page 24 for full menu. No.
14.2 Setting Items for Linear Display Mode (Re-scaling in arbitrary user defined units) Set the filter before setting the linear display mode (Refer to Section 11.1). The following table is the Setting Example 1, Linear Display Mode, Section 11-3. This applies when re-scaling in arbitrary user defined units. No. Setting Item Display mode Minimum pressure† Maximum pressure† Decimal point position LCD Display n- L;n 0.0 Min. pressure corresponding to OFFSET 9 : 10 (psi) Max.
†In the setting of a pressure, the decimal point position is fixed for each pressure range. (Refer to section 10, Power-on Message). The maximum pressure can be set from the value which is more than 25%F.S. of the pressure range above the minimum pressure. The values under 25%F.S. cannot be increased or decreased by $ # key. ‡For setting of zero point and span point in the analog output, input the percent value over the maximum display span (between OFFSET and FULL SCALE).
14.3 Setting Procedure Note: Holding the button for more than 3 seconds returns to display mode.
14.4 Loop Check In each display mode, regardless of applied pressure, the loop check can be activated by following the push button sequence in Section 13.1 and 13.2. This will link the display with the analog output. This allows for checking wiring, receivers, general troubleshooting etc. • Loop check method (Linear Display Mode) 1. Turn and remove the lid of this product. 2. Shift to the linear display mode in the setting item . (Refer to Section 13.2, Setting Procedure).
• Analog output terminal check When the front cover is removed, the analog output check terminals (pad: CH+, CH–) are visible at the upper part of the display substrate. The analog output can be checked during measurement mode or loop check by applying a probe such as a tester for current measurement, onto the check terminal of the substrate, as shown in the following figure. In addition, receivers are not affected.
15. MAINTENANCE & SERVICE • Periodic inspection Depending upon the type of use periodic inspection is recommended at least once a year. Please refer to the following items for periodic inspection: 1. Appearance 2. Display/output check via appropriate pressure standard.(1) 3. Display/output check via Loop Check(2) • Avoid ESD. When cleaning this product, please use soft, damp, cloth. • Do not use thinner, etc. which may cause deterioration and failure.
© 2011 Ashcroft Inc. 250 East Main Street, Stratford, CT 06614 USA Tel: 203-378-8281, Fax: 203-385-0402 www.ashcroft.com All sales subject to standard terms and conditions of sale. I&M011-10159_Rev. C_6.
