Installation and Maintenance Instructions for GC52 Differential Pressure Transmitter LOOK FOR THIS AGENCY MARK ON OUR PRODUCTS Version 5.0 10/07 © 2007 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&M011-10160 -7/10/08-Rev. A, Ver. 5.
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. CONTENTS CAUTION ............................................................................................ 4-5 PREFACE .......................................................................................... 5 OVERVIEW ........................................................................................ 5 FEATURES ........................................................................................ 5 SPECIFICATIONS.............................................
WARNING! READ BEFORE INSTALLATION 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.
USE IN LIFE SUPPORT DEVICES Ashcroft Inc. products are not authorized for use as critical components in life support devices or systems without the express written approval of the General Manager, Stratford Operations of Ashcroft Inc.
(5)) Loop Check Function: Allows the user to output an analog signal corresponding to differential pressure without applying pressure, simplifying system maintenance and troubleshooting. (6)) Zero and Span Adjustment: The adjustment of the Zero (4mA) and Span (20mA) reading via internal push buttons. (7)) IP65 / NEMA 4X Environmental Rating: Enclosure environmental rating suitable for indoor and outdoor installation, depending upon operating temperature range.
9. Units Pressure Units: inH2O (2), (1) arbitrary 10. Setting Adjustments Internal key switches (Mode, T, S) Scaling function: Linear output Filter function: User adjustable output damping select from 0, 2, 4, 8 and 16 (None, 2, 4, 8, and 16 (s)). Loop check function: User adjustable output for loop/ system check and troubleshooting, 4-20mA. Material: Aluminum die cast 11. Enclosure Environmental Rating: IP65 / NEMA 4X 12.
5. MOUNTING 5.1 General The GC52 was designed to be mounted using the bracket supplied. Pressure connections via the (2) 1⁄4 NPT female pressure ports. Although the display can be rotated in 90 degree increments by removing the display cover it is preferable to orientate the electrical termination downward, particularly in applications where protection from the environment is required. 5.2 Mounting Orientation It is preferable to orientate the unit with the pressure ports either downward or upward.
Lower connection diagram Connection: Lower side. M4 x 40 • 1.0 in. (25.4mm) mounting manifold Panel mounting bracket 1.4 (35) .55 (14) 1.8 (45.4) .33 (8.5) Equalizing valve .83 (21) 1.0 (25.4) (2) 1/4˝ NPTF Hex .83 (21) 6. PIPING Note: High (H) and Low (L) pressure sides of the device are marked on the yellow label affixed to the housing of the unit.
Note: • When transporting and / or mounting do not apply excessive shock or use device as a step. • The piping should be of proper length so as not to apply load to the connection point on the transmitter. • At the time of mounting or when bleeding air from the device be sure to open the equalizing valve with a flathead screwdriver so that excessive pressure (more than the allowable maximum differential pressure) is not applied to the differential pressure sensor.
Power source ＋ − Receiver ＋ − Transmission cable Terminal box Shield Display (board) Notch CASE Transmission cable (Twist) Inside sensor Line Sheath DISPLAY LCD holder CAP • Turn display over to expose terminal strip, make positive and negative connections, insert wire depth is equal to recommended strip length (0.25˝).
• After completing connections locate retaining clips in the appropriate notches and carefully place into the housing. Be sure that internal sensor transmission wire 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. • Tighten GC52 cover to maintain environmental rating.
8. DISPLAY FUNCTIONS Test Terminals CH+ g Linear scaling mode CH– GC52 b Differential pressure unit monitor h No function In H2O c Scaling - Arbitrary unit monitor 8.8.8.8.8.8. i Total flow volume a Measured data display l Total flow volume display (X1000) display (X1) k Total flow volume j Total flow volume display (X100) display (X10) M ▼ d MODE key DESIGNATION ▲ e DOWN key f UP key FUNCTION ➀ Measured data display Differential pressure, linear scaling value are displayed.
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. • To go from the Measurement Mode to the Zero Adjustment Mode (Section 14 for further detail) press and hold the UP T button for more than 3 seconds.
11. MEASUREMENT MODE The measurement mode includes differential pressure display mode, and 27 , please refer to linear (scaling) display mode. For the setting items 햲 to 쎻 the Setting Mode (section13.1). 11.1 Filter 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.
Setting example 1 : Differential pressure display mode The setting to use the differential pressure range 0 to 20in.H2O (“W.C.) and to display the zero point and span point of the analog output as –2 in.H2O and 18 in.H2O respectively is as follows: In the example the filter (moving average time) is set at 2 seconds, the differential pressure display and the analog output are based on the moving average equivalent to the differential pressure data per 100ms for the past 2 seconds (20 times).
• • The setting range for the minimum differential pressure P1 and the maximum differential pressure P2 is 0 to 100%F.S. of the differential pressure range, and the maximum differential pressure P2 is set from the value which is more than 25%F.S. of the differential pressure range above the minimum differential pressure P1. The setting range for the OFFSET and FULL SCALE values is –1999 to 1999, and the decimal point can be set arbitrarily.
See page 24 for full menu. For display mode, select “Linear display mode” ==> Setting item 햳 ==> Setting item 햷 Set min. differential pressure P1 as “20 in.H2O” ==> Setting item 햸 Set max. differential pressure P2 as “120 in.H2O” Set decimal point position of linear display as “one digit” ==> Setting item 햹 Set OFFSET of linear display as “0.0m” ==> Setting item 햺 Set FULL SCALE of linear display as “50.0m” ==> Setting item 햻 Set output zero point as “0.0%F.S.” (0.0m) of max.
11.4 Out of Range Display (1) Range Over display In the Measurement Mode, if the pressure is below –15% F.S. (URL) “–FFF” will be displayed, and if it is more than 115%F.S., “FFF” will be displayed. (2) Span Over display When the user has adjusted the span of the device this case will apply. The display range in each display mode is –5 to 105%F.S. of the display span. When this range is exceeded, the value of –5%F.S. or 105%F.S.
• Overage display –15%F.S. (–3.0 inH2O) more/less 115%F.S. (23.0 inH2O) more/less fff -fff • Span over display – 5%F.S. (–1.0 inH2O) more/less -0.050 105%F.S. (21.0 inH2O) more/less 1.050 12. ZERO ADJUSTMENT MODE In the measurement mode, the pressure connection (H, L) is open to the atmosphere and T key is pressed for more than 3 seconds in order to shift to zero adjustment mode (refer to section 11) for zero point adjustment of the differential pressure sensor.
13.1 For the setting procedure of each display mode, refer to paragraph 13.4. List of Setting Items for Differential Pressure Display Mode (Re-scaling in “inH20” units). Set the filter before setting the differential pressure setting mode. See page 24 for full menu. No. Setting Item 햲 Filter LCD Display f00002 Setting Description Setting Range Selection of moving average timeof differential pressure: 2 (sec) 0,2,4,8,16,sec Default* 4 *The factory default.
13.2 No Setting Items for Linear Display Mode (Re-scaling in arbitrary user defined units) Set the filter before setting the linear display mode (Refer to the preceding Section 11.1). The setting of the following table is the Setting example 2: Linear display mode of Section 11.3. (Arbitrary unit: m). This applies when re-scalingin arbitrary user defined units. See page 24 for full menu. Setting Item n00l0n - 햳 Display mode LCD Display 햷 Min. differen- tial pressure(1) 햸 Max.
(1) The decimal point position is fixed for each differential pressure range. (Refer to section 10,Power-on Message). The maximum differential pressure can be set from the value which is 25%F.S above the minimum differential pressure. The values under 25%F.S. cannot be increased or decreased by T, S key. (2) For setting zero point and span point of the analog output, input the percent value over the maximum display span (between OFFSET and FULL SCALE).
13.3 Setting Procedure (Setting Examples from 13.1, 13.2) u M key for more than 3 seconds Measurement Mode Setting Mode u 6.00 Version display u M a f 2 Filter u M b n Linear display mode setting (Re-scaling in “inH2O” units) (Re-scaling in arbitrary user defined units) a -10.0 a n- non u M d Flow Measurement Mode Differential pressure display mode setting u M c Basic key operation M key. The setting item is changed by u The set value is changed or selected by ▲ key or ▼ key.
13.4 Loop Check In each display mode, regardless of applied pressure, the loop check can be changed by arbitrarily linking the display with the analog output using the key operation. The display will show representative pressure readings correlating to the 4-20mA signal. 䡲 Loop check method (1) Remove the lid of this product. (2) Shift to either the Differential Pressure or the Linear Display Mode. (See Section 13.1 or 13.2). Use (M) button to scroll to Loop Check function as indicated within Section 13.
14. DIMENSION DRAWINGS Dimension Drawings Dimensions in inches 4.49 4 x Ø .22 Panel Mounting Holes Bracket t = .08 3.62 Drain Outlet 2.91 .42 2.28 GC52 2.07 Ø 2.56 5.12 4.72 inH2O .69 1.97 2.36 1.42 .82 Electrical Connection PG 13.5 threaded housing, factory installed options include cable gland or 1/2 FNPT conduit connection Equalizing Valve 1.0 Low Pressure Port 1/4 NPT female High Pressure Port 1/4 NPT female 26 2 x Ø .
15. MAINTENANCE AND WARRANTY 䡲 Periodic inspection Depending upon the type of use periodic inspection is recommeded 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) 䡲 CAUTION • Avoid electrostatic charging. When cleaning this product, please use a soft, damp, cloth. • Do not use thinner, etc. which may cause deterioration and failure.
© 2007 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&M011-10160 -7/10/08-Rev. A, Ver. 5.
