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When activated, the alarm contacts will open or close, triggering the mechanism of your choice, whether a buzzer, light or any other electrical device. The alarm is activated when the measurements stray away from the set point by a predetermined value in the 0.5 to 2.5 pH range.
Hanna’s exclusive Fail Safe Alarm System protects against problems caused by power supply failure or signal interruption, which are typical risks in industrial environments. An alarm condition is indicated by a red LED, located directly on the front panel of the controller.
A dial on the front panel renders manual temperature compensation fast and easy. For automatic temperature compensation hook up a three wire Pt100 to the controller.
This controller is housed in a rugged, modular, fiber-reinforced ABS housing.
0.0 to 14.0 pH
0.1 % pH
manual, 1 point through CAL (offset) trimmer
maximum 2A (fuse protected), 250 Vac, 30 VDC
acid or alkaline
contact open=acid dosage=relay ON if measurement > setpoint
contact closed=alkaline dosage=relay ON if measurement < setpoint
adjustable from 0 to 14 pH
adjustable, typically from 5 to approximately 30 minutes
BL981411-0: 12 VDC adapter (included);
BL981411-1: 115/230 VAC; 50/60Hz
83 x 53 x 99 mm (3.3 x 2.1 x 3.9’’)
BL981411-0: 200 g (7.1 oz.);
BL981411-1: 300 g (10.6 oz.)
BL981411-0 (12 VDC) and BL981411-1 (115V) are supplied with mounting brackets, transparent cover, and instruction manual.
0.0 to 14.0 pH
0.01 % pH
through “OFFSET” and “SLOPE” trimmers (max. ±1.5 pH for offset and 80% to 110% for slope)
automatic from 0 to 50°C with Pt100 probe or manual from -10 to 80°C
Alarm Relay Setpoint
from 0.00 to 14.00 pH with “COARSE” and “FINE” trimmers with “ACID” or “ALK” (alkaline) selection
Alarm Relay Range
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 varies by more than user selectable interval (0.5 to 2.5 pH) from set point or due to ove
relay terminals (115 to 240V, max.2A,1,000,000 strokes) are activated when pH exceeds the set point with “ACID” dosage or falls below the set point with “ALK” selection (alkaline dosage)
Analog Output Signal
user selectable 0 to 20 mA or 4 to 20 mA over the 0-14 pH range with isolated output
fiber-reinforced, self-extinguishing ABS
±10% 115 VAC; 50/60 Hz
-10 to 50°C (14 to 122°F); RH max 95% non-condensing
221 x 181 x 86 mm (8.7 x 7.1 x 3.4’’)
1.6 kg (3.5 lb.)