TIM BATT WATER SOLUTIONS ORP CONTROL IN PUBLIC POOLS/SPAS

Transcription

1 TIM BATT WATER SOLUTIONS ORP CONTROL IN PUBLIC POOLS/SPAS SIEMENS Wallace & Tiernan Control/dosing & UV PULSAR Dry Chlorine Systems BECS Technology Controllers

2 BECSys Pool Controllers with ORPmV and FAC control

3 ORP (Oxidation/Reduction Potential) is a direct measure of the rate of Oxidative Disinfection Redox OXIDATIVE DISINFECTION SCALE More Oxidation = More Corrosion < Reduction (0) Oxidation > 0.1mg/L 0.2mg/L 0.3mg/L 0.4mg/L 0.5mg/L 0.8mg/L 1.0mg/L 2.0mg/L 5.0mg/L 20mg/L 100mV 200mV 300mV 400mV 500mV 600mV 700mV 800mV 865mV COMFORT ZONE FOR BACTERIA AND ORGANISMS IN WATER (Equivalent to 0C to 50C temperature) Polio Virus dies in 5mins (550mV) Polio Virus dies in 30secs (650mV) Cryptosporidium excysted in 30mins at 865mV ORP (17mg/L ph 7.2 or 40mg/L ph 7.8) Copyright TBWS July 2012

4 What are chloramines? Ammonia (from bathers) + Free Chlorine 650mV ORP approx 720mV ORP approx Presence of a weak oxidant acts as a REDUCTANT! Copyright TBWS July 2012

5 Affect of ph on FAC work value (and on ORPmV) 50% drop in FAC work value between ph 7.0 and ph 8.0 ORP mv 1mg/L free chlorine residual ph 7.0 ph 8.0 Copyright TBWS July 2012

6 ORP control can Predict Demand in water mV ORPmV probe ORPmV controller Pool e- Organic load Water e- e- SCAVENGING of ELECTRONS is the initiating reaction of Chlorine s toxic effect in water. This can happen up to 10mins before the residual starts to drop. TRANSFER OF ELECTRONS = VOLTAGE In this case that measured voltage is ORPmV e- e- e- Copyright TBWS July 2012

7 ORP Control Advantages - Summary 1. ORP is a direct measure of the rate of oxidative disinfection 2. ORP responds to the presence of a weak oxidant (chloramines) acting as a reductant in water 3. ORP responds directly to changes in the work value of a free chlorine residual 4. ORP can predict demand (initiating dosing prior to the residual starting to drop)

8 Sys 3 Controller with ORPmV and/or FAC control

9 Sys5 Controller with ORPmV and/or FAC control North Sydney Olympic Pool, 25m & Spa use both ORP and Free Chlorine probes together to control chlorine residual and disinfection

10 Bracketed ORPmV control (BECSys5 & Sys7 controllers) Also known as CEDOX control in SIEMENS Depolox Pool controllers Minimum allowable FAC Residual or ORP (eg 720mV or 2.0mg/L) ORPmV or FAC setpoint for normal disinfection or residual based control (eg 750mV or 2.5mg/L) Maximum allowable FAC residual or ORP (eg 3.0mg/L or 780mv)

11 Gold Coast Aquatic Centre & Wet n Wild Sydney Referals Wet n Wild Sydney 9 x BECSys5ppm Controllers with Liquid Chlorine & Acid GCAC, QLD 6 x BECSys5ppm Controllers with Salt Water Chlorination on 3 pools; Cal Hypo on 3 pools; Co2 feeders

12 GCAC Pan Pac Swimming 14 & Commonwealth Games 2018

13 High ORP Readings (above 850mV) - Likely Causes 1. Overdoses or manual doses of chlorine - superchlorination 2. Overdoses or manual doses of acid intentional or accidental 3. Controlled low ph in a pool (at ph 7.0) where dosing program causes it (eg, auto granular cal hypo feeders, which add acid as well) 4. Shock doses of Non-Chlorine Shock type products (with low ph. Eg, Potassium Monopersulphate) 5. Incorrect operation of equipment, or overdose by Ozonator or UV unit

14 Low ORP Readings (below 650mV) Likely Causes 1. Acid or CO2 supply has run out, meaning that ph has gone high (often disabling chlorine feed) 2. Chlorine supply has run out or feeder is undersized for application 3. Chlorine injection point has blocked with crystallisation (needs clean) or feeder has lost prime 4. ph feeder is undersized for application and can t keep up with ph changing effect of chlorine addition 5. Faulty ph calibration or faulty ph probe on controller

15 Erratic ORP Readings (Rapid Change) Likely Causes 1. Low Total Alkalinity (resistance to ph change) below 80mg/L causing unstable ph 2. Overdoses of liquid acid caused by oversized ph feeder or increased acid strength 3. Unstable sensors, caused by recent cleaning with neat acid, or superchlorination 4. Excessively high Cyanuric Acid Stabiliser levels (over 25mg/L) 5. Poorly calibrated equipment, or faulty sensors. Electrical interference

16 Informative Display & Intuitive Menu System Corrimal 50m pool - BECSys5ppm Display Shows:- ph Level 7.7 Paused ORP Level 740mV Free Chlorine 1.9ppm Feeding Up Temperature 28C Langelier Saturation Index +0.1 Ryner Stability Index 7.5 Calcium Hardness 114 Total Alkalinity 125 Last LSI Calculation date Facility Name Location Rep Name Rep Phone Number Time and date Active Alarms

17 Free Chlorine Sensor + ORP Optimum control High-quality, low replacement cost FAC sensor No maintenance; circulating glass beads - self cleaning ppm range for auto superchlorination & recording (up to 25ppm CYA stabiliser) Single-point recalibrations based on ph & DPD tests Bracketed ORP/PPM control

18 Total Chlorine Sensor Provides total chlorine and combined chlorine readings ppm range Single-point calibrations based on DPD test Compliance with new Health Department guidelines Provides alarms. Controls UV and air handling systems

19 Combined Chlorine & UV control UV Control Manage UV system more efficiently to reduce energy costs and prolong lamp life Breakpoint Chlorination Prevent formation of & use UV to remove chloramines Adaptive chlorine setpoint Dynamically determine chlorine setpoint based upon combined chlorine levels

20 Readings and Information Auto-Fill Surge Tank Level TDS Heater Filter Backwash BW Tank Level Turbidimeter Flow Sensor Pressure Sensor, Pump effluent PSI/Vac Sensor Pump influent Circ Pump VFD Liquid Level Measuring ph, Cl BW Holding Tank

21 Add local PC to hub Ethernet Switch Remote PC BECSys7 BECSys for Windows Local PC BECSys for Windows BECSys5 BECSysBW

22 Advantages Common access to data logs and parameters One application accesses all historical data and control parameters Some data may not otherwise be available Integrated historical data logs Diagnostics Compliance Common, user-friendly interface Tailored to the aquatics industry Unified alarm notification On-site Remote, to service and/or management personnel Improved performance Enhanced water quality Equipment safeguards

23 Common Access BECSys for Windows - PC software

24 Multiple Pools Single Screen Viewing - GCAC, Qld

25 Integrated Data

26 Information Gateway Text message MODBUS / BACnet Powerful Analysis Ethernet Off-site access

27 BECSys VFD Patent Pending BECSys 4-20ma, relay VFD Circulation Pump Signet Flowmeter or psi sensor

28 BECSys5 Advanced Recirculation Pump Features VFD control algorithm Controls recirc pump to maintain desired flow rate Four manual and four scheduled turndowns Override setting for backwash Ramp up and ramp down settings Minimum output setting Total Dynamic Head (TDH) monitoring Monitors pump for proper operation Requires strainer vacuum and filter influent pressure transducer inputs TDH high and low alarms (can be disabled) Fireman Switch controls UV lamp output or Ozone feed or fireman switch timer Heater

29 Summary BECSys controllers can integrate numerous features in an aquatic facility All parameters are accessible through BECSys for Windows All inputs are logged for comprehensive data analysis All alarms are signaled through BECSys mechanisms (fax, , SMS) Operators do not need to learn to interface with multiple systems Costs savings are achieved by eliminating peripheral redundant devices, and utilizing more cost-effective proprietary sensors