Easy Installation
Designed with mounting holes built into a rugged base, BL7917 is simple to install. All of the controls and pump assemblies are conveniently located on the front of the unit.
Rugged Construction
BL7917 is housed in rugged, fiber-reinforced polypropylene IP55 rated casings to protect from hazardous spills and splashes. PVDF, FPM/FKM and PTFE materials are used for all parts that come into contact with liquid to resist corrosion caused by chemicals.
Simple Pump Action
A positive displacement solenoid with few moving parts makes the BL7917 more reliable than motor-driven pumps since there is no rotating parts, gears or cams; drastically reducing any chance of mechanical failure.
Proportional Dosing
A proportional control slows down the stroke rate as the measured value approaches the user selectable set points, avoiding overdosage of chemicals. This feature makes the pump’s dosing more accurate, saves chemicals and eliminates unnecessary and costly corrections to your process, especially with slow reacting chemicals.
Isolated Recorder Output
To enhance troubleshooting and the ability to record data while monitoring, simply attach a recording device to the instrument’s 4 to 20 mA output contacts, conveniently located on the front panel, to obtain a copy of the results on demand.
Auxiliary Dosing Contacts
Allows the user to attach a mixer or priming pump that is activated only when the pump is dosing.
| Specification Name | Detail |
|---|---|
| sku | BL7917-1 |
| ORP Range | -999 to +999 mV |
| ORP Resolution | 1 mV |
| ORP Accuracy (@20°C/68°F) | ±5 mV |
| Typical EMC Deviation | ±6 mV |
| Input Impedance | 10^¹² Ohm |
| Dosage | Proportional, acid or base, user selectable |
| Dosing Contact | Isolated, 2A, Max. 240V, resistive load, 1,000,000 strokes |
| Alarm Contact | Isolated, 2A, Max. 240V, resistive load, 1,000,000 strokes |
| Recorder Output | 4 to 20 mA (isolated) |
| Alarm Contacts | Terminals can be configured as normally open or normally closed (isolated output Max. 2A, Max. 240V, resistive load, 1,000,000 strokes). The alarm is activated if pH falls below the setpoint by the userselectable interval (0.0 to 2.0 pH), or conductivity exceeds the setpoint by more than the user-selectable interval (0 to 2.0 mS/cm) or due to overdosage |
| Probe | Any combination pH electrode with a universal BNC connector and Hanna Conductivity 4-ring potentiometric probe with built-in temperature sensor and DIN connector (optional) |
| Dosing Terminals | Two sets of independent terminals (115 to 240V, Max.2A, 1,000,000 strokes) are activated whenever pH exceeds the pH setpoint and/or conductivity falls below the EC setpoint |
| Power Supply | 230 Vac ±15% 50/60 Hz (40 W |
| Environment | 0 to 50°C (32 to 122°F); RH max 95% non-condensing |
| Dimensions | 221 x 142 x 181 mm (8.7 x 5.6 x 7.1”) |
| Weight | Approximately 5 kg (11 lb.) |
| Ordering Information | Each pump is supplied complete with: discharge and suction valves, LDPE tubing, 7 m (23′), power cord, and instruction manual. |
