007-100 and 007-120 AExd and Explosion Proof Valve Position Monitors now carry the following certification:
Class I, Divisions 1 & 2, Groups B, C and D. Class II, Groups E, F and G. Class III. T4/T6; Type 4, 4X, 6 and 6P.
Class I, Zone 1, AEx d IIC T4/T5/T6. Zone 21, AEx tb/tD. IIIC T135oC/T100oC/T85oC. IP66/67/68 and/or Type 4, 4X, 6 and 6P.
Ex d IIC T4/T5/T6. Ex tb IIIC T135oC/T100oC/T85oC. Class II, Groups E, F and G.IP66/67/68 and/or Type 4, 4X, 6 and 6P.
The enclosures are supplied in either coated aluminium or ANC 4B (316) stainless steel. NPT cable entries up to ¾” are available.
The products have been designed to accommodate, as an option, the latest version of the top mounted highly visible Klearvision position indicator. It is directly driven from the input shaft, no internal gearing is required. (Click on image to enlarge).
The 007-100 is a compact solution that can contain up to 2 switches or a 4-20mA position transmitter. Two point cover fixing reduces commissioning times. The larger 007-120 can contain up to 4 switches and a 4-20mA position transmitter.
Ambient temperature ranges have, where possible, been extended. Some AEx d and Explosion Proof versions can achieve -60oC to +70oC at T6 or -60oC to +120oC at T4.
Both Baseefa and CSA have issued K Controls with ingress protection test reports.
Enclosures have passed IP66, IP67 and IP68 tests to EN 60529:1991. IP68 at a depth of 30 metres for 96 hours. Standard units are rated IP66 and IP67. IP 68 versions are available to special order.
Nema Enclosure Types 4, 4X, 6 and 6P.
For subsea use enclosures are availablein a range of materials including carbon steel, 316L stainless steel, 254SMO stainless steel (20%Cr -18%Ni-6%Mo), Duplex 2205 and Super Duplex. Sub-sea connectors and cable can also be supplied.
There is a very extensive range of monitoring equipment that can be fitted in this range of Position Monitors.
Switch options include micro switches, hermetically sealed magnetically operated reed switches and standard or failsafe inductive proximity sensors. Potentiometers of various different values can be geared or directly driven. A solenoid back wiring facility can be provided so that switches and solenoid can be wired to the control room via a single multicore cable without the requirement for a separate junction box.
007-100 and 007-120’s fitted with certain switches are suitable for both Low and High Demand scenario applications at SIL1 or SIL2 of IEC 61508. Versions fitted with Namur proximity sensors are suitable for both Low and High Demand scenario applications at SIL2 of IEC 61508. Versions fitted with fail safe proximity sensors and used in conjunction with safety rated barriers, are suitable for both Low and High Demand scenario applications at SIL3 of IEC 61508. Declarations of Conformity are available on request.
For continuous feedback of valve position or for monitoring the performance of critical emergency shutdown valves during partial stroke testing, 4-20mA, 4-20mA + HART®, PROFIBUS® PA or FOUNDATION™ FIELDBUS position transmitters are available in K4-20 variants.
Designed for use in the oil, gas and petrochemical industries these units can be fitted to a wide range of quarter turn or linear valve actuators.
Versions certified ATEX, IECEx or INMETRO are available for use in other parts of the world.
When a single valve position monitoring device does not provide all the functions required, tandem or even triple mounting one or two additional devices can be the answer.
K Controls distributor in Sweden, Gustaf Fagerberg, has reported that this has been done on a number of emergency shut down valves supplied recently to a leading provider of polyolefins, base chemicals and fertilizers.
Please click on the photograph to enlarge. In this case the partial stroke test device gives valve position feedback via a 4-20mA signal but end of travel limit switches were also required. The K Controls 007 Ex ed certified switchbox can be seen next to the P.S.T. unit.
This approach could also be useful if five or more switch inputs are required or if a positioner does not have all the required position feedback functions.
K Controls have now obtained a variation to their Exd ATEX and IECEx certificates to enable AS-interface® or DeviceNet™ to be taken into areas where hazardous gasses or combustible dusts may be present. The 007-120 valve position monitor (click image to enlarge) also has provision to back wire one or two remote mounted solenoids. As is the case with all Exd equipment, Ex cable glands and armoured interconnecting cable have to be used and no live maintenance or calibration is permitted.
AS-interface® and DeviceNet™ are relatively simple field bus systems where the requirement is to distribute digital I/O (inputs and outputs) to monitor inputs from switches or sensors (level, travel limit, fault alarms etc.) and or control outputs to on/off devices such as solenoid valves or relays. In such applications the requirement for high-speed data transmission is not critical and the need to process significant amounts of data at the node does not exist. Generally the control function is on/off and the speed at which the related equipment operates is far slower than the electronic data transfer rate. Electronic hardware cost is an important factor with local nodes needing to be relatively simple generally with a maximum I/O count of 4.