Installation and Maintenance Instructions for GC52 Differential Pressure Transmitter Version 6.03 5/11 LOOK FOR THIS AGENCY MARK ON OUR PRODUCTS © 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&M011-10160 -5/11-Rev. C, Ver. 6.
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 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.
• When disconnecting, remove the ground LAST! Note: The shield and drain wire in the cable (if supplied) is not connected to the transmitter body, and is not a suitable ground. 1. PREFACE Thank you for purchasing the GC52 Rangeable Differential Pressure Transmitter. Refer to the Ashcroft GC52 Data Sheet for product specifications and applicable operating conditions. 2.
(7) Zero and Span Adjustment: The adjustment of the Zero (4mA) and Span (20mA) reading via internal push buttons. (8) Key Lock Function: Prevents inadvertent overwriting of setting values. Can not be reset by restoring power when activated. (9) IP65 / NEMA 4X Environmental Rating: Enclosure environmental rating suitable for indoor and outdoor installation, depending upon operating temperature range.* (10) CE Compliance: EN613261 1997, A1/1998, A2/2001 (Heavy Industrial).
. Rangeability / Adjustment 8. Display Zero: –10 to +110% FS Span: –10 to + 110% FS Character height: 10mm, with LCD display with LED backlight Pressure / linear display: (4) LCD digits max. Display update: 500 ms Pressure Units: inH2O (2), (1) arbitrary 9. Units 10. Setting Adjustments Internal key switches (Mode, T, S) Scaling function: Linear output, linear and momentary flow rate display/output. Filter function: User adjustable output damping select from 0, 2, 4, 8 and 16 (None, 2, 4, 8, and 16 (s)).
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 1.4 (35) .55 (14) 1.8 (45.4) Panel mounting bracket .33 (8.5) Equalizing valve .83 (21) 1.0 (25.4) (2) 1/4˝ NPTF Hex .83 (21) 6. PIPING O-rings 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.
9. MODE CHANGES • Measurement Mode (Section 11 for further detail) will be entered upon power-on. Setting Mode (Section 14 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 12 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 to the Setting Mode (section14). 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 Section 14.4 for full menu. For display mode, select “Linear display mode” ==> Setting item ==> Setting item Set min. differential pressure P1 as “20 in.H2O” ==> Setting item Set max. differential pressure P2 as “120 in.H2O” Set decimal point position of linear display as “one digit” ==> Setting item Set OFFSET of linear display as “0.0m” ==> Setting item Set FULL SCALE of linear display as “50.0m” ==> Setting item Set output zero point as “0.0%F.S.” (0.0m) of max.
11.4 Flow Measurement/Square Root Extraction Mode Square Root Display Mode Combining the sensing elements (orifice and pitot tube) with this product, the mode is used for the display of the momentary flow rate, integrated volume and for analog output corresponding to the momentary flow rate. (1) Momentary flow rate Maximum display span from zero to the maximum momentary flow rate.
• When the display resolution lowers and the wobbling of momentary flow rate increases in the low flow domain of the differential pressure flow meter, the domain (below the set value) will be forcedly indicated as zero by means of the low-cut for momentary flow rate. Moreover, the analog output has a fixed value of 4mA at the zero point. For setting of low-cut, input the percent value over the maximum display span. Its range is 0 to 30%F.S.
• Integration is halted during the "FFF" display at the time of differential pressure range OVER (Refer to paragraph 11.5 (1) ). • The indicated value which is blinking is integrated during the "blink" display at the time of momentary flow rate display span OVER (Refer to paragraph 11.5 (2) ).
Set the output span point as “100.0%F.S.” (120.0 arbitrary unit of measure) of max.
䡵 Square Root The momentary flow rate Dx at a generated differential pressure of 16IW (40%F.S.) is calculated by the following formula: The coefficient k is determined by substituting the maximum momentary flow rate Dm=120 and the then differential pressure Pm=80%F.S.(32IW) into the formula (b) of the preceding paragraph 11.4 (1). k= 公 Dm00 Pm 100 = 公 120 = 134.2 80 100 Therefore, the momentary flow rate Dx is determined by the formula (a) of the preceding paragraph 11.4(1). 公 Dx = kx Px = 134.
Setting of integrated volume When a momentary flow rate unit is set as an arbitrary unit, the integrated volume is also an arbitrary unit and the factor of the two following points must be set: • Setting of time factor (second, minute, hour) • Setting of flow factor weight (1, 10, 100, 1000) In the differential flow meter whose differential pressure generated at maximum momentary flow rate of 1.000L/s is 16IW (80%F.S.) and which uses a differential pressure range of 0 to 2.
䡵 Square root display and analog Momentary flow rate display (arbitrary unit) Differential pressure: 12IW Integrated volume display (arbitrary unit) • Momentary flow rate 0.868 Integrated volume: 570616 • Analog output: 17.9 mA 0.868 Differential Pressure (IW) 16 | 12 | 0 Display alternation whenever the (M) key is pushed (Manual) Momentary Flow Rate Unit Span Point 1.000 | 0.868 | Zero Point 0 25 570616 Analog Output (mA) 20 | 17.
11.5 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. KEY LOCK Function Key Manual Setting of key lock MODE+$ one second Release of key lock MODE+$ one second Indicator LoC UnL Operation during keylock Function Key Manual Zero adjust. mode Hold value reset $ key greater than 3 sec. LoC (Key invalidity) # key greater than 3 sec. LoC (Key invalidity) Indicator 14. SETTING MODE The setting modes include differential pressure display mode setting, linear display mode setting, and flow measurement/square root mode setting.
The setting of the following table is the Setting example 1: pressure display mode of Section 11-2. This applies when re-scaling in “inH20” units. See Section 14.4 for full menu. No. Setting Item Display mode Output zero point(1) LCD Display n00non a0-10.0 Output span point(1) Loop check(2) a0-90.0 [0-10.
No Setting Item LCD Display n00l0n - Display mode Min. differen- tial pressure(1) Max. differen- tial pressure(1) Decimal point position p0 -20 p0-120 d0-001 OFFSET d0-00.0 FULL SCALE d0-50.0 Output zero point(2) Output span point(2) a0-50.0 a0100.0 Loop check(3) [0-50.0 Setting Description Setting Range Default Selection of linear non: Differential display mode: Lin pressure display mode; Lin: Linear display mode non Min.
14.3 Flow Measurement/Square Root Extraction Mode No. Setting Item Display mode 21 22 23 Maximum differential selection1 Flow rate decimal pt. position Max. momentary flow Low cut ~n roT D Displays of value after deci- 0,1,2,3 digit mal point, # of digits 0 A 0.0 Output span point2 A100.0 0 to 1999 Forces display and output to zero Momentary flow rate of analog output zero point (4mA): 100.0% F.S. Momentary flow rate of analog output zero point (20mA): 100.0% F.S.
14.4 Setting Procedure (Setting Examples from 14.1, 14.2) 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.
Flow Measurement Mode (Square Root Extraction Settings) Refer to Page 5 N ROT b Flow Measurement / Square Root Extraction Mode u M P. 4.00 n Maximum Differential Selection (Exam ft:4in) u M d 0 C D d i C D d Z C D d 3 o Flow Rate Decimal Point Position u M D 1000 p Maximum Momentry Flow u M L 0.0 q Low Cut u M a 0.0 r Output Zero Point u M a 100.
14.5 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, linear display or flow measurement modes. (See Section 14).
15. 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 35 2 x Ø .
16. 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.
© 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&M011-10160 -5/11-Rev. C, Ver. 6.
