CenterPoint Water Treatment Equipment Specification

with Remote Internet Communications

Complete water treatment equipment system shall consist of the following components:

1. Controller:  Furnish a conductivity controller with four taggable feed timers, 5 control relays, flow switch assembly, two contacting head water meter inputs, detailed on-board history, and Internet-based remote communications.  Controller shall accept an input line voltage of 95-240 VAC (50/60 Hz) and produce an output relay voltage of 115 VAC (3-amp, individually-fused relays). Manual activation of relay outputs shall be accomplished through the use of H-O-A keys with user-defined timeouts.  Controller shall feature an on/off switch and come pre-wired with an 8’ male power cord and five 6” female output receptacles. Controller shall be programmable via a tactile-feedback ATM-style keypad and shall feature a 16-line full graphic LCD display. Controller shall be housed in a NEMA 4X type housing with a padlock able, gasket, clear viewing door.  Controller shall come stamped with an approved safety listing (UL, ETL, or CSA). Controller shall include a ¾” schedule 80 PVC bypass assembly containing a conductivity probe tee assembly, flow switch tee, and sample port with shut-off valve rated to 120 psi and 140°F.
   1. Conductivity control circuit:  Conductivity control circuit shall be capable of measuring from 0-10,000 μS in one micro Siemen increments.  Controller shall feature an adjustable set point, differential, high alarm, low alarm, and bleed limit timer.  Conductivity control circuit shall energize a 115VAC, 3-amp, individually-fused relay tied to a solenoid valve when the system conductivity exceeds the set point and shall remain energized until the system conductivity falls below the differential level.  All set points and alarm levels shall be adjustable over the full conductivity measurement range and the limit timer shall be adjustable from 0-1439 minutes.
   2. Taggable timers:  Controller shall feature four taggable feed timers which shall be selectable between five different activation modes (pulse, percentage, limit, post bleed, and 28-day clock).  Timers shall each activate a 115VAC, 3-amp, individually-fused relay tied to a chemical feed pump based on the user-defined feed method.
   3. Water meter inputs: Controller shall include two digital inputs for contacting head water meter inputs and provide hourly and daily water meter usage history and be able to calculate evaporation if one water meter input is supplied in the make-up and bleed-off line.
   4. Control relays:  Controller shall feature five 115VAC, 2.5-amp, individually-fused control relays which shall be activated or disabled by multiple user-defined alarms or events.
   5. Flow switch:  Controller shall include a flow switch to prevent activation of relays in the event of “no flow” through the flow assembly.
   6. Digital inputs: Controller shall have 5 additional digital alarm inputs.
   7. On-board history collection:  Controller shall automatically gather operating data such as conductivity, temperature, makeup water volume, bleed-off water volume, calculated evaporation volume and other specified digital and analog inputs at user-adjustable intervals.  Controller shall include a built-in “service report” tool for the manual entry of up to ten user-defined test parameters (i.e., alkalinity, hardness, etc.). Controller shall retain all history in its on-board memory for a period of no less than one calendar year.  Controller shall be able to present all data in both graphical and tabular format on the controller display without the need to export the data to another source.
   8. Remote communications:
      1. Network:  Controller shall include a Category-5 network cable and plug for interfacing with the facility’s computer network and external Internet connection.  Controller shall use DHCP network protocol for “plug-and-play” compatibility with modern computer networks (Static IP address can be configured also. Cellular Routers are optional).  Controller shall not rely on phone line-based dial-up connections. Controller shall be remotely accessible from any internet-enabled computer, tablet or phone using any common web browser and shall not require that any proprietary software be installed on the remote computer(s).  Controller shall maintain a persistent Internet connection with its host server for continuous data collection, and all data shall be continually backed up on dual servers for historical archiving. Remote communications shall rely on 128-bit SSL encryption technology for the highest communications security level.  Communications network shall allow users to receive immediate notification of any user-specified alarm conditions via e-mail (or e-mail enabled cell phones or pagers).
      2. Interface:  Remote interface shall allow a user to view and change all of the controller’s operating parameters.  Remote interface shall allow viewing, graphing, and exporting all historical data including conductivity, temperature, water usage (makeup, bleed-off evaporation), and all user-defined service report fields. 
      3. BACnet: Controller shall also be capable of connecting to most building management systems (BMS) using BACnet protocol via Ethernet TCP/IP for one way data sharing from the controller to the BMS.  Desired data points can be mapped by the BMS operator using an object-oriented approach for information within the controller. Lonworks & MODBUS protocols are also available. WESCO Chemicals model number WES-XSCF4E-H21 (no approved equal).
2. Chemical Metering Pumps:  Furnish four chemical metering pumps for automatic injection of water treatment chemicals.  Pumps shall be rated from 0-30 gpd at a maximum injection pressure of 110 psi. Pumps shall feature a built-in degassing valve to prevent loss of prime caused by trapped gases in the pump head.  Pumps materials of construction shall be suitable for the chemicals being used. Pumps shall include a foot valve, injection valve, and all required 3/8” tubing for the suction, discharge, and priming return lines.  Pumps shall be rated to accept a 115VAC input and feature a 3-amp, quick-blow fuse.  WESCO Chemicals model number WES-B130X1-KFCV.
3. Water Meters:  Furnish a ¾” bronze-body multi-jet contacting-head water meter with totalizer for both the makeup water line and the bleed-off water line.  Water meters shall feature a 10-gpc electrical dry contact output for transmitting both makeup and bleed-off volume to the cooling tower controller.  WESCO Chemicals model number WES-AWM-075.
4. Bleed-off Assembly:  Furnish a pre-assembled ¾” bleed-off assembly consisting of a brass shutoff valve, a clear plastic bowl strainer, and a zero-psi differential brass-body motor open, capacitor return ball valve.  Ball valve shall accept a 115VAC input.  WESCO Chemicals model number WES-ABS-3/4-J1.
5. Corrosion Coupon Rack:  Furnish a four-station corrosion coupon rack constructed of ¾” schedule 80 PVC with clear PVC piping over the coupons.  Coupon rack shall be mounted on a rigid polyethylene panel and shall include inlet and outlet shutoff valves and flow indicator.  Coupon rack shall feature four O-ring sealed quick-disconnect coupon holders with nylon hardware for mounting each coupon specimen. WESCO Chemicals. model number WES-ACR-40-B-7.
6. Pre-Fabrication:  Furnish a pre-fabricated panel with the controller, chemical metering pumps and sample stream assembly complete with quick release injection tees and isolation valves pre-mounted on a polyethylene panel to insure correct installation of water treatment equipment. WESCO Chemicals, model number WES-WM21-A6B4D4E6.
7. Double Wall Chemical Containment:  Furnish double wall containment tanks for each chemical product constructed of polyethylene where a 58-gallon inner tank sits inside a 70-gallon outer tank and one removable lid goes over both for easy access and cleaning.  The lid shall provide a large poor-in hole and have an adjustable low-level alarm wand pre-mounted. WESCO Chemicals, part number WES-DCT-55-DS1W .

Please contact WESCO Chemicals, Inc. for customized solutions, for full plant operations.

• 4-20 ma inputs (available in groups of 4, maximum of 8)
• Audible and visual process alarms
• Temperature monitoring
• Process pressure monitoring
• LED relay control lights
• And assorted other sensor capabilities