zxc ® 02-Окт-2012 14:58
Description
The oil detector/alarm ORGS 11-2 works according to the conductivity measurement principle. The electronic control unit of the ORGS 11-2 is an integral module of its terminal case and controls all functions – external switchgear is therefore not required.
A control and alarm unit should be added on downstream of the ORGS 11-2 in order to protect the installations to be cooled and prevent the possibility of oil leakage. The ORGS 11-2 has two channels for true fail safe confidence and features NC-type contact relays which will automatically signal alarm condition in the event of a malfunction or mains failure.
Design
The oil detector/alarm ORGS 11-2 consists of the following components:
Measuring pot for separating oil from water.
The measuring pot can be isolated and features an automatically-operated quick-action air vent and a plug cock for draining and purging.
Oil detector/alarm ORGS 11-1, screwed into the measuring pot. The ORGS 11-2 is of the compact design type, consisting of a four-tip measuring electrode with integral alarm switch.
The equipment works according to the level conductivity measurement principle, making use of two channels to detect any ingress of oil.
Use the oil detector/alarm e. g. for cooling water monitoring to detect ingress of oil.
Type approval GL 17106-00 HH When cooling water is used in marine installations
for preheating or cooling oil or fuel, an oil detector, which will raise an alarm in the event of
ingress of oil, is required according to Germanischer Lloyd.
Function
A water sample, taken downstream of the location at the highest point where ingress of oil might occur, is fed from below into a measuring pot (see schematic representations Fig. 2 and 3).
In the measuring pot the water-immiscible oil droplets precipitate and ascend, thereby forming an oil film which forces the water level to drop accordingly.
The lowering of the water level is detected by the electrode rods since the oil, which is nonconductive, interrupts the current flow between the two long and two short electrode rods. Two volt-free relay contacts in the terminal box evaluate the information and, if required, trigger an alarm and operate the associated switchgear.
The amount of oil necessary to raise an alarm depends on the design of the measuring pot and the length of the electrode rods. The measuring pot is matched to the electrode such that an alarm is given when the oil content limit
of approx. 50 ml is reached. The system can detect practically all insoluble, water-immiscible, non-emulsified matter with a lower density than water and a conductivity below the preset response sensitivity. Rust preventing oils which
are for instance emulsified in cooling water will not trip an alarm.
Technical Data
Oil detector/alarm ORGS 11-2 with measuring pot
Admissible service pressure 6 barg (87 psig)
Admissible service temperature 110 °C (230 °F)
Flow velocity 100 – 300 l/h
Raising of alarm Oil content limit: approx. 50 ml
Water inlet, draining Ball valve, screwed connection E0 type 15-L
Water outlet Ball valve, screwed connection E0 type 12-L/S
Weight Approx. 7.4 kg
Electrode ORGS 11-1 Electrode
Connection Screwed 1" BSP (DIN ISO 228-1) Material of wetted parts
Body: Austenitic S. S. X 6 CrNiMoTi 17 12 2 (DIN ref. 1.4571)
Measuring electrode: Austenitic S. S. X 6 CrNiMoTi 17 12 2 (DIN ref. 1.4571)
Electrode insulation: PTFE ∅ of measuring electrodes: 5 mm
Terminal box Housing
Terminal box with two lids Material: aluminium
Protection IP 65 to DIN EN 60529
Admissible ambient temperature 70 °C
Cable entry Cable glands with integral cable clamps
2 x PG 9, 1 x PG 16 Mains supply
115/230 V ± 10 %, 50/60 Hz The transformer is of the split-bobbin type
according to VDE 0551.
Special voltage 24 V ± 10 %, 50/60 Hz
Power consumption 5 VA
Fuse Thermal fuse Tmax = 102 °C
Sensitivity Range 1: 10 μS/cm Range 2: 0.5 μS/cm
Code-switch selectable Electrode voltage 10 Vss
Outputs for control circuit
Two volt-free relay contacts,
contact material AgNi 0.15 hard gold plated.
Max. contact rating with switching voltages
of 24/115/230 V a.c.: 8 A resistive/inductive.
Max. contact rating with a switching
voltage of 24 V d.c.: 8 A
Energizing and de-energizing delays
3 seconds, factory set
Indicators and adjustors
Two red LEDs to indicate “Electrode rod
submerged” and “output relay energized”
One four pole code switch for selection of
sensitivity range
Вложение 1379863211_orgs11-2datasheet1.pdf (143 KB, Скачано: 383 раз)
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