Liquid Level Transmitter
SERIE CT801A MODULAR
Technical Manual
SAS au Capital de 2 158 244 € - 444 871 933 R.C.S. Bourges - APE : 2651B Headquarter : 9, rue Isaac Newton - 18000 Bourges - France
Liquid Level Transmitter Technical Manual Serie CT801A Modular
1st Edition Released February 2014
TABLE OF CONTENTS 1. UNPACKING and INSPECTION ............................................................................................................4 2. OVERALL VIEW ....................................................................................................................................4 3. TECHNICAL SPECIFICATIONS ............................................................................................................5 4. INSTALLATION ON NON-PRESSURIZED TANK ..................................................................................6 5. INSTALLATION ON PRESSURIZED TANK ...........................................................................................6 6. CONNECTIONS ....................................................................................................................................7 6.1. Connection of pneumatic supply .....................................................................................................7 6.2. Electrical connection.......................................................................................................................8 6.3. Connection of a pressure indicator (CT050 or CT080 type) ..........................................................10 7. START-UP ...........................................................................................................................................11 7.1. Switch Power ON .........................................................................................................................12 7.2. Pressure built –up ........................................................................................................................12 8. CHECKING OPERATION ....................................................................................................................13 8.1. Check in dynamic state ................................................................................................................13 8.2. Check in static state .....................................................................................................................13 9. ANNEX A .............................................................................................................................................14 10. ANNEXE B .........................................................................................................................................18
1. UNPACKING and INSPECTION Carefully unpack and inspect the equipment. In case of damage file proper reserves with carrier. The identification plate secured to the cap includes all characteristics of transmitter.
2. OVERALL VIEW
1 Identification plate 2 Explosion-proof case containing electronic transmitter.
∅ 117 mm
> 200 mm
3 Safety pin
100 mm
4 Electrical stuffing-box 5- NPT 1/8" coupling for gas cover connection
1
6 NTP 1/8" coupling for connection of pressure indicator
2
3 7 Air flow setting screw 4
R
255 mm
5 6
Ü T
7 8
8 NTP 1/4" coupling for air supply connection 9 NTP 1/4" coupling for pneumatic testing (only with optional safety valve) 10 Mounting of CT801 bubbling probe:
and
connection
10.1 Flange PN 16-DN 50 with threaten coupling 1/2" NPT 10.2 Cylindrical 1’’ gas fitting (Class A, according to Standard NFE 03.005).
10 9
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of
3. TECHNICAL SPECIFICATIONS ●
Transducer ranges MEASURING RANGE 0-50/70 mbar 0-70/350 mbar 0-350/1050 mbar 0-1050/2100 mbar 0-2100/4100 mbar
●
Output current :
●
Supply : Electric power supply :
4 to 20 mA DC, 2 wires system 18 to 28 Vdc
Instrument air supply : ●
Pressure :
4 to 10 bars
●
Consumption :
10 l/h at current pressure
●
Accuracy : Reference accuracy :
± 0.3 % F.S. at 20°C including repeatability, hysteresis and non-linearity.
Temperature drift :
0.008% FS per Celsius degree between – 20°C and + 80°C
●
Operating temperature :
-40°C to +70°C
●
Storage temperature :
-50°C to +85°C
●
Material :
Pneumatic modulator : brass or stainless steel Transducer enclosure : aluminium alloy or stainless steel
●
Protection Class :
●
Protection for use in hazardous area (see also ch. 6.2.2) :
IP66/67 II 1 G D Ex ia IIC T6 Ga, certificate number LCIE 02 ATEX 6182X
●
or :
II 2 G D Ex d IIC T6 Gb, certificate number LCIE 02 ATEX 6182X
Marine classification :
DNV, GL, BV, LRS, ABS, RINA, RMRS, CCS, NKK CE marked in accordance with EU directives
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4. INSTALLATION ON NON-PRESSURIZED TANK
CAUTION: When the CT801 is installed lower than the event pipe, an isolating valve must imperatively be provided on the bubbling probe in order to enable start-up and disassembly of device. This valve should be installed 30 cm away from CT801 transmitter. Sufficient air reserve should also be provided between the valve and the probe end; we recommend a buffer value of approximately 0.5 litres.
Furthermore, the piping going to the probe should not present any low point. In addition, it is recommended to install an isolating valve on the bubbling probe in any type of installation : UNTIL START UP AND BEFORE ANY OPERATION ON THE CT801 TRANSMITTER, THE ISOLATING VALVE ON THE BUBBLING PROBE MUST IMPERATIVELY BE CLOSED. Then, proceed as follow : ●
Close the isolating valve on bubbling probe if present;
●
Connect the bubbling probe to NPT ½ ‘’ coupling or to 1’’ gas coupling (depending of the connection mode);
●
Mount the CT801 over a counter-flange or over a support plate;
●
Check for proper sealing on the bubbling line;
●
Leave the plastic breather-cap on the « gas cover » connection if present (please refer to §2) When intended to be installed on deck, the CT801A « gas cover » connection is fitted with a venting nipple.
5. INSTALLATION ON PRESSURIZED TANK CAUTION: An isolating valve must imperatively be provided on the bubbling probe in order to enable start-up and disassembly of device. This valve should be installed 30 cm away from CT801 transmitter. Sufficient air reserve should also be provided between the valve and the probe end; we recommend a buffer value of approximately 0.5 litres.
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Whenever gas cover pressure is higher than values shown below, the CT801 must imperatively be installed as shown on diagram §7.2.3. (R1 & R2 isolate the tank - R3 equalises HP & LP pressures - R4 de-pressurises the circuit in case of emergency). SCALE RANGE
MAXIMUM GAS COVER PRESSURE
0-50/70 mb 0-70/350 mb 0-350/1050 mb 0-1050/2100 mb 0-2100/4100 mb
1300 mb 1300 mb 2000 mb 4000 mb 5000 mb
Proceed as follow : ●
Close the isolating valve on bubbling probe;
● Connect the bubbling probe to NPT ½’’ coupling or to 1’’ gas coupling (depending of the connection mode); ●
Mount the CT801 over a counter-flange or over a support plate;
●
Check for proper sealing of bubbling line;
●
Connect the gas cover to NPT 1/8’’ coupling (refer to §2).
6. CONNECTIONS 6.1.
Connection of pneumatic supply ●
The CT801 transmitter must be supplied with instrument-quality air at a pressure of 4 to 10 bar. (Do not hesitate to contact us for an air dryer and oil extractor);
●
Provide a valve on the supply circuit;
●
Connect the air supply to NPT ¼’’ coupling marked with an arrow (see §2).
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6.2.
Electrical connection
6.2.1 Supply voltage Supply voltage = 18 to 28 Vdc, to be determined according to the line impedance as shown on the following diagram:
650 LOAD h 325
0 15
21.5
28
33 Vdc
Precautions for intrinsically safe installation EEx ia
The CT801A transmitter, version certified II 1 G D Ex ia IIC T6 Ga under certificate n° LCIE 02 ATEX 6182X, must be associated to an intrinsically safe certified device, complying with the transmitter's intrinsic safety parameters.
The internal capacitance Ci is ≤ 10 nF; the inductance Li is negligible. In particular the supply source characteristics must comply with : Ui (Vdc)
Ii (mA)
Pi (W)
≤ 28
≤ 140
≤1
The result of such association is an intrinsically safe system, which must be certified. The certification is the responsibility of the provider of the associated device. As consequence, a suitable Zener barrier must be installed in Safe Area, to be inserted in line between CT801A and power supply / measure acquisition device.
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Then, proceed as follows: ●
The connections are to be performed with power off;
●
Open the explosion-proof case by unscrewing the cap, after removing the safety pin with a 6 mm hex socket wrench;
●
Dismount the explosion-proof stuffing-box;
●
Use bifilar shielded cable with external sheath (lead diameter under 2.5 mm²). Stuffing-box gland allows passage for a 8 to10 mm diameter cable as a standard ;
●
Bare the cable (sheath and shield) over approximately 20 cm; insulate the shield;
●
Insert the cable through the cable-clamp and stuffing (make sure that the cable and stuffing diameters match).
●
Loosen the 2 mounting screws of electronic circuit;
●
Insert the 2 wires in opening of printed circuit;
●
Connect to the terminal box as shown on following diagram :
POWER SUPPLY + LOAD
+
SIGNAL 4-20 mA
−
In + ELECTRONIC CONVERTER
In -
CONNECTION TO TERMINALS 4-20 mA
●
Remount the electronic circuit;
●
Tighten the stuffing-box and its cable-clamp;
●
Close the explosion-proof case by locking the threaded cap;
●
Remount the safety pin. CAUTION: Compliance with the above requirements is imperative in order to preserve the explosion-proof characteristics of the case.
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6.3.
Connection of a pressure indicator (CT050 or CT080 type)
Connect the pressure indicator to NPT 1/8’’ coupling marked “R” (see §2) according to the following diagram :
CT801
Pressure indicator with overpressure valve
R Isolating valve NPT 1/8’’ Female coupling « R »
CAUTION: Before connecting the pressure indicator, imperatively close the isolating valve of the probe (if any) when the tank is under load.
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7. START-UP ●
Since the CT801 is factory pre-set, no setting is required a priori. Should setting become necessary, proceed as shown in § 3.5 of Maintenance Manual.
●
The measuring range is shown in mbar on the identification plate. This value corresponds to the maximum hydrostatic pressure P, calculated as follows:
Maximum level to be gauged
B H
A
Bubbling probe
h
Tank bottom
Level A = Probe ending in open air ●
Hydrostatic pressure = 0
●
Current supplied by transmitter I = 4 mA
Level B = Maximum liquid level ●
Hydrostatic pressure = H ( cm ) x d x 0.981
●
Current supplied by transmitter I = 20 mA H = gauged height d = density of liquid h = non-gauged height
Note: Set the Zero on the indicator or on the programmable automaton to obtain the display of the height h or the corresponding volume. ●
Check that the pneumatic lines are air-tight and in compliance with our recommendations.
●
Check that the electrical connection is in compliance with diagram of §6.
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7.1.
Switch Power ON
7.2.
Pressure built –up
7.2.1 In case of non-pressurised equipment ●
Open the air supply circuit
●
Open the isolating valve of bubbling probe
7.2.2. In case of low-pressurised equipment ●
Open the air supply circuit
●
Open the isolating valve of probe
●
Open the isolating valve of the “inert gas” circuit
7.2.3. In case of high-pressurised equipment ●
With closed isolating valves, open the air supply circuit
●
Open the valve R3
●
Open the valve R2
●
Close the valve R3
●
Open the valve R1 NPT 1/8’’ coupling for gas cover connection (ATM)
R3
R4
R1
R2
Inert gas
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8. CHECKING OPERATION 8.1.
Check in dynamic state
Compare the height of the liquid in tank and the value displayed on the indicator.
8.2.
Check in static state
Note: This check can be easily performed with Enraf Marine Systems’s test kit ●
Close the isolating valve of probe
●
Open the explosion-proof case by unscrewing the cap after removing the safety pin. CAUTION: In case of dangerous atmosphere opening of CT801 explosion-proof case is prohibited. A milli-ammeter must then be connected to the measuring circuit, away from the dangerous area.
●
Complete the pneumatic and electrical connections as shown on the following diagram: Test terminals
Pressure gauge
+ − − + Voltmeter
Isolating valves
Precision screw Precision pressure reducing valve
●
Start the air and power supply to CT801
●
Compare the generated pressure with the measuring signal 4-20 mA, according to the instructions of § 6.1.
●
After testing, reassemble and seal the dismounted connections.
NOTE:
HONEYWELL MARINE guarantees the relationship hydrostatic pressure / 4-20 mA measuring signal and indicator, as defined in the order. Any errors due to improper installation, improper utilisation, signal treatment, density deviations, gauging curves and leaks in lines cannot in any way be attributable to HONEYWELL MARINE
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9. ANNEX A
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10. ANNEXE B
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11. ANNEXE C
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Honeywell Marine SAS 9, Rue Isaac Newton 18000 Bourges France Tel + 33 (0) 2 48 23 79 01 Fax + 33 (0) 2 48 23 79 03 E-mail:
[email protected] www.honeywellprocess.com
MM322382-rev09-ENG February 2014 © 2014 Honeywell International Inc.