product data sheet ds1225

product data sheet ds1225
Unit 10 Campbell Court, Bramley,
Tadley, Hampshire.
RG26 5EG, England.
Tel: +44(0)1256 884901
Fax: +44(0)1256 882986
E-mail: sales@roxspurmc.co.uk
www.controlsdirect.com
PRODUCT DATA SHEET
DS1225
VAMPIRE – ELECTRONIC FLOWMETER
Type GMTX
A metal tube variable area flowmeter for liquid, gas or steam measurement, with microprocessor enhanced
performance and LCD panel display of flow rate and total.
For line sizes from 15-100mm, the VAMPIRE (Varia ble Area Micro Processor Indicator Readout Electronics)
has a totally solid state measurement system, eliminating mechanical hysteresis errors. Microprocessor
interpolatio n between flow data poin ts stored in factory calibrated look-up tables gives an improvement to ±1%
accuracy for this technique.
The Platon GMT range of metal tube VA flowmeters are robust and cost effective measurement devices,
particularly applicable where dangerous or toxic fluids require the increased operatio nal security and integrity
of a fully weld ed construction. Useful for high pressure (100 bar) or high temperature (200 oC) applications, the
VAMPIRE electronic transmitter offers a 10:1 flow range.
The loop powered 4-20mA transmitter is certifie d intrinsically safe to CENELEC standards, for use in a
potentia lly hazardous area. Both loop powered and AC main s powered units have separate high and low
flow alarm outputs.
FEATURES
•
4-20Ma Transmitter
•
Intrinsically safe approval
•
Liquid or Gas Flow Calibration
•
Built-in Flow Totaliser
•
Operator adjustable High and Low
Alarms
DS1225
•
1% Accuracy
•
VA meter reliability
Issue 1: 22/04/02
Page 1 of 4
PRODUCT DATA SHEET
DS1225
OPERATING PRINCIPLE
The VAMPIRE is a metal tube variable area flowmeter: as the flow up through the precisio n machined
tapered tube increases, the float rises, reaching an equilibriu m position. Electron beam weld ed within the
float casing is a magnet. Two “Hall effect” magnetic field sensors measure both the vertical and horizontal
components on this field. The angle of the magnetic field defines the position of the float in the tapered
tube. This solid state measurement eliminates the problems of mechanical hysteresis associated with
conventional magnetic poin ters. Field angle is also independent of the absolute valu e of magnet strength,
and sensor sensitivity.
The measurements are compared with a look-up table of field and flow data, stored in the VAMPIRE
microprocessor memory on factory flow rig calibration. Flow rate is deduced accurately by interpolatio n
between data poin ts. The microprocessor converts the flow rate to correct Engineering units for the digital
display on the LCD, adju sts the display meter poin ter and 4-20mA output, sets the Alarm status and
increments the totaliser as necessary.
Keypads on the VAMPIRE front panel are used to set flow alarm levels, zero the totaliser and sele ct the
digital display as rate or total. Via a password entry procedure, the site engineer can reset the display
units or even rescale the flowmeter to allo w for changes to process conditio ns. This programme also has
sele ctio ns to define what functions are accessib le to the operator, plus zero, span and time constant
adju stments.
DS1225
Issue 1: 22/04/02
Page 2 of 4
PRODUCT DATA SHEET
DS1225
SPECIFICATION
Flow tube:
Size:
Flow:
Rangeability:
Pressure max:
Temperature:
Housing:
Glands:
Earth Stud:
Damping:
Response time:
Brass or Stainless steel, screwed or flanged
connections. See Data Sheet DS1220.
15mm to 100mm.
See Flow Range Table.
Vertically upwards.
10:1 minimum.
Up to 100 bar standard
Fluid max. 300oC. Ambient max. 40oC min.
–20oC typically.
Polyester coated aluminium.
Weatherproof to IP65
4 off suitable for 2-5mm cable.
External M6 stud fitted.
Gas meters have integral flow pulsation damper.
Display update rate 2 per second.
Step response time constant adjustable 3-100
seconds.
Model GMTXA:
Model GMTXD:
Display:
Calibration:
Analogue output:
Resolution:
Alarm output:
Totaliser:
Approval:
Zener Barriers:
AC powered, 85-265 Volts 50-60Hz
Loop powered 24Volt DC Nominal, 12V min.
Intrinsically safe transmitter.
LCD meter, 0-100% scale 90mm long.
Digital display, 4_ digits 10mm high.
Selectable for Rate or Total.
±1% FSD
GMTXA: 4-20mA into 600Ω max.
GMTXD: 4-20mA 2 wire transmitter.
0.5%
GMTXA: 2 x 8A SPCO relay.
GMTXD: 2 x open collector transistors.
Display 1-19,999. Pulse output selectable
instead of flow alarm output. 50msec pulse
length. Max pulse rate 2/sec (GMTXD).
Model GMTXD is approved intrinsically safe
to CENELEC EExia IICT4.
28 Volt 300Ω for 20mA line.
10 Volt 50Ω for alarm signals.
FLOW RANGES
Model
GMTX 1
(15mm/ _” Ø 250
long)
GMTX 2
(25mm/1” Ø 250 long)
DS1225
Flow
Digit
Water
(L/Hr)
Air
(m3/Hr)
Max
∆P
(mBar)
Model
Flow
Digit
Water
(m3/Hr)
Air
(m3/Hr)
Max
∆P
(mBar)
1
2
3
4
160
250
400
600
5
7.5
12
18
15
30
20
35
GMTX 3
(50mm/2” Ø 250 long)
1
2
3
4
6
10
16
25
180
300
600
1000
30
40
80
190
1
2
3
4
5
6
1000
1600
2500
4000
6000
10,000
30
50
75
120
200
360
15
30
35
80
160
400
GMTX 4
(80mm/3” Ø 300 long)
1
2
3
25
40
60
-
140
220
525
GMTX 5
(100mm/4” Ø 400 long)
1
100
-
440
Issue 1: 22/04/02
Page 3 of 4
PRODUCT DATA SHEET
DS1225
METAL TUBE FLOWMETER FAMILY
VAMPIRE flow measurement electronics can be supplied with any of
the Platon metal tube variable area flowmeters in the GMT family (see
leaflet DS1220). Stainless steel flanged units are available for line sizes
15-100mm. DIN PN16 or ANSI 150 flanges are stocked, other flanges
can be supplied, or flow tubes produced in alternative materials. For
the highest corrosio n resistance a PTFE lined meter can be supplied,
with a ceramic float.
For simple and cost effective installa tions, meters, with screwed
connections are available in brass or stainless steel, the latter bein g
suitable for pressures up to 100 Bar. Sizes _”, 1” and 2” are held in
stock with BSP threads. Special models are available for arduous
duties, for example all brass desig ns or degreased units for oxygen
service. Hygienic polished stainless steel units, designed to be crevice
free for food and pharmaceutical applications, are produced with end
fittings accordin g to customer requirements.
Model Number GMT B XA 1 5 1 G
GMT family
Model type
No digit
B
S
P
H
Fluid
G = Gas
L = Liquid
Flanged stainless
Brass body screwed
Stainless body screwed
Ptfe lined flanged
Hygienic polished
Digit to identify specified Flow Range
(See Table on previous page)
VAMPIRE
XA
XD
Flow pipe size
1
2
3
4
5
AC powered
CENELEC Approved
Loop powered
End Connections
1
Flanged DIN PN16
2
Flanged ANSI 150
3
Flanged DIN PN40
4
Flanged ANSI 300
5
Screwed BSPP female
15mm or _”
25mm or 1”
50mm or 2”
80mm or 3”
100mm or 4”
TO ORDER
Specify process conditions at
measurement point (fluid type,
density/SG, viscosity, temperature
and pressure) plus operational flow
range and flow units required.
INSTALLATION
1.
2.
3.
4.
5.
6.
7.
All VA meters are designed for installa tion vertically, with flow upwards.
The upstream and downstream pipe bores should suit the nominal size of the instrument.
Ensure that no ferromagnetic material is situated within 100mm of the indicator.
Model GMTXA has output rela ys de-energised for alarm conditio ns.
Model GMTXD transistor outputs are “off” for alarm conditio ns. The negative line is common to the
transistor outputs and the loop supply.
Intrinsically safe installa tions of Model GMTXD should be in accordance with BS5345 Part 4. The 420mA loop should be protected by an approved standard 28 Volt 300Ω shunt diode safety barrier. If
required, the alarm outputs should be connected via approved 10 Volt 50Ω safety barriers.
It is recommended that the VAMPIRE LCD display is protected from both extremes of freezing and
direct sunlight.
Every effort has been made during the preparation of this document to ensure the accuracy of statements and specifications. However, we do not accept liabilit y for damage, injury, loss or expense
caused by errors or omissions made. We reserve the right to withdraw or amend products or documentation without notice.
DS1225
Issue 1: 22/04/02
Page 4 of 4
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