Envco – Environmental Equipment

Range of Versions
We offer a range of WQS versions to help you meet your monitoring needs: the standard version (WQS-STD), which includes the sampler unit, with the controller and a 9-channel serial/ USB datalogger in a separate enclosure; the light versions (WQS-LTS and WQS-LTU), which includes the sampler and a controller with a built in 2-channel serial or USB datalogger in a separate enclosure; and the integrated version (WQS-INT), which includes the sampler, a 9-channel serial/USB datalogger, and a controller within a single enclosure.

Powerful System Controller
The WQS’s controller includes an LCD display that shows the type of sensor being monitored, the data reading, and the engineering units. The display also indicates if either relay has been triggered since last reset, which relay was triggered, and whether the maximum or minimum limit was exceeded. Two separate relays are provided: one is used to trigger the WQS’s sampler, and the other can be used to control a variety of external devices including alarms, mixers, pumps, control valves, fl oodgates, and telemetry systems. Each relay is independently programmable to trigger on maximum and/or minimum levels in one of three different modes.

Rugged Composite/Discrete Water Sampler
The WQS’s lightweight composite/discrete water sampler is enclosed in a rugged rainproof enclosure. The sampler includes a 2.5-gallon polyethylene sample bottle, a peristaltic sampling pump, a pickup hose, a circuit board controller, a rechargeable gel cell battery, and a battery charger.

With the unit’s water sample size control, you can take individual time-weighted composite samples or full-bottle discrete grab samples.

Smart Water Quality Data Recorder
The WQS’s water quality data recorder includes Windows™-based Global Logger II software, which provides many useful features, such as real time readout, measurement interval and engineering unit selection, station ID setting, and sensor calibration. The software makes accessing stored data and setting options easy. The data recorder also includes Windows™ Cebased PDA software for simple fi eld data collection.

The WQS-STD and WQS-INT feature a data recorder with 7 analog channels, 2 pulse channels, and USB and serial communication ports. The WQS-LTS and WQS-LTU features a recorder with one analog channel, one pulse channel, and either a serial (LTS) or USB (LTU) communication port.

Specifi cations

Process Controller
Sensor Display 5 digit LCD
Accuracy 0.1% full scale + 0.005mA + sensor error

Analog Sensor Input
4-20 mA, 0-5V, 01V jumper selectable
Input Resolution .005mA or 1.2mV
Sensor Types/Units Water level (feet/meters), temperature (°F/°C), pH (no units), dissolved oxygen (%), turbidity (NTU/ppm), conductivity (μS), wind speed (mph/Kph), wind direction (°), soil moisture (%), custom sensor (any of the above, mA, mV, or custom programmed units)
Relay Contacts Voltage: 30VDC
Current: 5A/30VDC
Max Capacity: 150W
Relay 1 (All), Pulse Output: NPN to Ground, 1.0Kohm pull-up resistor (connected to sampler) (WQS-STD, WQS-LTS, and WQSLTU only)
Relay 2 (All), Pulse Output: NPN to Ground, Open-collector (WQSSTD, WQS-LTS, and WQS-LTU only)
Relay Time Ranges 1-60,000 seconds (16.7 hours)
Resolution: 1 second increments
Sleep Time Range 1-240 minutes (4 hours)
Resolution: 1 minute increments
Analog Output 4mA minimum, 20mA maximum (sensor reading)
Resolution: 0.005mA

Power
WQS-STD, WQS-LTS, WQS-LTU: Independent 12VDC rechargeable battery
WQS-INT: Uses the sampler’s 12VDC rechargeable battery 60mA DC normal, 100 mA maximum 120μA during sleep mode

Data Recorder
Memory Non-volatile fl ash memory
Power WQS-STD, WQS-LTS, and WQS-LTU: Independent 12VDC rechargeable battery WQS-INT: Uses sampler’s 12VDC rechargeable battery
Standby Current: 70μA typical
Logging Current: 5mA typical + sensor current

Analog Sensor Inputs
4-20 mA
Resolution: 12-bit, 4096 steps
Sensor Warm-up Time: Programmable, 0 to 60 sec
WQS-STD and WQS-INT: 6 input channels + flow rate + battery voltage monitor
WQS-LTS and WQS-LTU: Flow rate + battery voltage monitor

Digital Inputs
Maximum Input Voltage: 24VDC
Maximum Frequency: 100Hz
Minimum Pulse Width: 2mS
Maximum Count: 65,535 (16-bit)
WQS-STD and WQS-INT: Sample event + 1 input channel
WQS-LTS and WQS-LTU: 1 input channel connected to sample

Sample Modes Fixed interval programmable from 1 sec to >1 yr
High speed 10 samples per second
Logarithmic sample rate (approximation)
Exception (log only on deviation from previous reading)
Storage Capacity WQS-STD and WQS-INT: 40,879 recordings for all inputs plus time stamp

WQS-LTS and WQS-LTU: 81,759 recordings for all inputs plus time stamp
Data Overwrite Select memory wrap or unwrap (unwrap will stop logging once memory is full)

Communication Ports
WQS-STD and WQS-INT: RS-232 DB9 or USB Type B
WQS-LTS: RS-232 4-pin circular connector
WQS-LTU: USB Type B

Selectable Baud Rates
9600, 19200, 28800, 38400, 57600, 115200
Clock Synchronizes to user’s computer

Operating Temperature
Industrial, -40°C to +85°C (battery may not apply)
Enclosure Expanded UV protected PVC

Ordering Information
Water quality sensors sold separately.
The WQS-STD includes a sampler and external controller and datalogger.
The WQS-LTS and -LTU includes the sampler and a controller with a built in 2-channel serial (LTS) or USB (LTU) datalogger in a separate enclosure.
The WQS-INT includes the sampler with an internal version of the controller and datalogger.

WQS-STD2 Standard Water Quality Sampling System
WQS-LTS3 WQS with Built-In Serial Datalogger
WQS-LTU3 WQS with Built-In USB Datalogger
WQS-INT4 Integrated Water Quality Sampling System

Accessories & Parts
PDAWL16 PDA Package
00-010 Spare 12V Gel Cell Battery
FE0400 Battery Charger
00-419 2.5-Gallon Plastic Bottle
00-8356 1-Gallon Glass Bottle
CB0200 Bottle Cap with Float Switch
CA0300 Stainless Steel Suction Strainer
00-546 Suction Hose, per foot
00-744 Peristaltic Pump Tubing,per foot