The BL983321 is a compact, panel mounted, process controller for measuring total dissolved solids (TDS) of a process stream that is within the 0.00 to 19.99 ppm (mg/L) range. The device features a large LCD with protective cover. Users may choose from automatic or manual dosing modes. When in automatic mode the dry contact relay is activated when a reading is above the set point. The relay can be used to activate a solenoid that switches from one DI (deionized) tank to another or to open a valve that will allow lower TDS water to flow into a tank being monitored in order to lower its TDS. The BL983321 can also be used to monitor the quality of water produced from ion exchange, reverse osmosis (RO) or distillation.
*The BL983321 uses a 0.5 conversion factor in which 1.00 μS/cm = 0.50 ppm.
Multicolor LED Indicator
LED changes color based on status.
Fire Retardant Casing
For additional safety the controllers outer case is made of fire resistant plastic.
Splash Resistant Cover
A clear plastic cover protects the face panel from dirt and liquids.
Adjustable Dry Contact Dosing Relay
The BL983321 features a dosing relay that is activated when the reading is above a user programmable set point.
Programmable Overdose Protection
For enhanced safety the mini controller can be programmed to deactivate the dosing relay if the set point is not reached within a specified time interval. The overdosing timer is programmable from 5 to 30 minutes or disabled.
Relay Control Override
With the flick of a switch the mini controller's relay can be disabled (Off), placed in control (Auto), or be activated for manual operation (On) which is useful for priming a dosing pump.
Multicolor LED Indicator
Multicolor LED indicator allows an operator to quickly check the status of the controller.
- Green = Meter in measurement mode and reading is below the set point.
- Orange/Yellow = Reading is above the set point and the relay is activated.
- Blinking Red = Indicates an alarm condition such as when the maximum dosing time has been exceeded.
Fuse Protected Dosing Contacts
The relay dosing contact is rated for up to a 2A load and is fuse protected.
Labeled Termination Connections
Quick-connect terminal blocks are clearly labeled for easy connection to power, conductivity probe and relay that can be used to operate a dosing pump, valve, audible alarm, or light.
1/2'' NPT Male Threaded Amperometric Probe for Mounting In-line*
The BL983321 mini controller uses the HI7634 conductivity probe that is available with different cable lengths.
*HI7634 is not included and must be ordered separately
| SKU | BL983321-web |
|---|---|
| Product Name | TDS Mini Controller (0.00 to 19.99 ppm) - BL983321 |
| Quote Required | Yes |
| TDS Range | 0.00 to 19.99 ppm (mg/L) |
| TDS Resolution | 0.01 ppm (mg/L) |
| TDS Accuracy | ±2% f.s. |
| TDS Calibration | manual, with CAL trimmer |
| EC/TDS Temperature Compensation | automatic from 5 to 50°C (41 to 122°F) with β =2%/oC |
| EC to TDS Conversion Factor | 0.5 |
| EC/TDS Dosing Relay | maximum 2A (fuse protected), 250 Vac, 30 VDC |
| EC/TDS Dosing Set Point | adjustable from 0 to 19.99 mg/L (ppm) |
| Over Dosing Control | adjustable, typically from 5 to approximately 30 minutes |
| Power Supply | models “-0” |
| Dimensions | 83 x 53 x 99 mm (3.3 x 2.1 x 3.9’’) |
| Weight | models “-0” |
| Ordering Information | BL983321-1 (115/230 VAC) and BL983321-0 (12 VDC) are supplied with mounting brackets, transparent cover and instruction manual. |
US 14223 
GB 11219 
CA 10390 
AU 9302 
IE 6990 
BR 2861 
NZ 2020 
SG 741 
