VN202 mkII Oxygen Analyser User Manual
Contents
1. Specification 0 100 Oxygen 1 of full scale Expected 36 48 months 10 months in 100 02 Weight 235g including battery and sensor Storage Temp 0 C 50 C 10 C 50 C recommended Accessory Parts List Specifications subject to change VN202 mkli User Insert Eng V1 2 Part Number 7990102 Date 09 11 Trouble shooting Symptom Possible Cause No display Not switched on Battery exhausted Batteries in wrong way Batt Lo Symbol Battery exhausted Replace battery Zero Reading Sensor exhausted Sensor disconnected rotate sensor whilst connected to the instrument there may be a deposit on the jack plug or the sensor jack socket Not Calibrating Sensor nearly exhausted check sensor in 100 oxygen then check sensor again in air Reading Drifting Sensor nearly exhausted In a flowing gas temperature of sensor changing Wind blowing on flow divertor Inaccurate Reading Interference from RF move away from RF source i e boat VHF radio or radar Do not use flowing gas take reading in a static gas Condensation on sensor face remove condensate by gently shaking the sensor Vandagraph Ltd 15 Station Road Crosshills Keighley West Yorkshire BD20 7DT United Kingdom Tel 01535 634900 Fax 01535 635582 www vandagraph co uk sales vandagraph co uk technical vandagraph co uk VN202 mii Oxygen Analyser User Manual These instructions should be read before using the VN202 mki2. l Mixed gas diving should only be undertaken by divers trained by a recognised training organisation Copyright 2011 Vandagraph Ltd All worldwide rights reserved Contents Please check you have the following items 1 VN202 mkIl 2 Quick Ox or DINKIT The VN202 mkil has been designed as one of the next generation of diving oxygen analysers following on from the successful VN202 Suitable for the worldwide hostile diving environment the VN202 mkll is easy to use with either hand and has very large digits It uses the proven R 17VAN oxygen sensor as used in the VN202 with integral temperature compensation It is powered by two internationally available AA alkaline batteries with an estimated life of 12 18 months The VN202 mkIl is available in 2 versions yellow On Off button automatic switch off green On Off button manual switch off The instrument is sealed for water resistance IP65 and designed to be drop resistant The battery is housed in a separate compartment from the sealed electronics and can be changed without the use of a tool Ensure batteries are fitted correctly See internal labels Full comprehensive user manual is available as a download from www vandagraph co uk Just register your purchase How to use the VN202 mkil 1 With the flow diverter on the sensor wave the sensor through the air 2 Adjust calibration to 20 9 in air 3 Insert the Oxygen Sensor i
3. nto the Quick Ox 4 Turn on the gas to a gentle flow 5 Mate the Quick Ox to the cylinder outlet 6 When the reading stops rising turn off the cylinder If in doubt repeat Effects of Altitude amp Humidity At very high altitudes some sensors with low outputs may not calibrate up to the level required In this instance altitude ambient pressure and total pressure must be taken into consideration and the surface equivalent oxygen percentage calculated metres Pressure mb o 305 0 202 2000 610 0 195 14 Although not substantial humidity can affect the maximum accuracy that can be obtained This accounts for the difference observed between ambient air calibration and calibration with dry gas from a cylinder RH40 RH60 RH80 RH100 0 C 32 F 20 9 20 8 20 8 19 10 C 50 F 20 8 20 7 20 7 20 6 20 30 C 90 F 20 5 20 3 20 1 40 C 100 F 20 4 20 1 19 8 19 5 Using the VN202 mkIil with a DINKIT 20 C 70 F 20 7 20 6 20 5 20 4 Follow instructions 1 6 as with Quick Ox Refer to information sheet on the DINKIT
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