Variable Area Flowmeter (VAF) with Two Switching Points

NCL and NCH switch types

NCH stands for "normally closed high" - when the top of the orange internal float is above the switch, the contacts will be closed.

NCL stands for "normally closed low" - when the top of the orange internal float is lower than the switch, the contacts are closed.

Most alarm systems operate on a "normally closed" basis - so when the alarm condition occurs, the contacts open, triggering the alarm. This acts as a fail safe in case the cable is damaged or broken as, detecting a break in the system, the alarm will activate.

If you require a different switching combination, please call us.

Products Total Items: 7
20mm Flowmeter with two adjustable switching points
Ref: 2967
25-250 lph. Plain union PVC ends
Switch 1 - NCH switch - open contacts on low flow, closed on high
Switch 2 - NCL switch - closed contacts on low flow, open on high
Maximum 24v ac-dc, 0.5A
Approximately 10 day delivery time.
£83.04 (£99.65 inc VAT)
20mm Flowmeter with two adjustable switching points
Ref: 2968
100-1000 lph. Plain union PVC ends
Switch 1 - NCH switch - open contacts on low flow, closed on high
Switch 2 - NCL switch - closed contacts on low flow, open on high
Maximum 24v ac-dc, 0.5A
Approximately 10 day delivery time.
£83.04 (£99.65 inc VAT)
32mm Flowmeter with two adjustable switching points
Ref: 2969
250-2500 lph. Plain union PVC ends
Switch 1 - NCH switch - open contacts on low flow, closed on high
Switch 2 - NCL switch - closed contacts on low flow, open on high
Maximum 24v ac-dc, 0.5A
Approximately 10 day delivery time.
£97.22 (£116.66 inc VAT)
40mm Flowmeter with two adjustable switching points
Ref: 2970
0.6-6m3/h. Plain union PVC ends
Switch 1 - NCH switch - open contacts on low flow, closed on high
Switch 2 - NCL switch - closed contacts on low flow, open on high
Maximum 24v ac-dc, 0.5A
Approximately 10 day delivery time.
£128.96 (£154.75 inc VAT)
63mm Flowmeter with two adjustable switching points
Ref: 2971
1.6-16 m3/h. Plain union PVC ends
Switch 1 - NCH switch - open contacts on low flow, closed on high
Switch 2 - NCL switch - closed contacts on low flow, open on high
Maximum 24v ac-dc, 0.5A
Approximately 10 day delivery time.
£206.21 (£247.45 inc VAT)
75mm Flowmeter with two adjustable switching points
Ref: 2972
8-40 m3/h. Plain union PVC ends
Switch 1 - NCH switch - open contacts on low flow, closed on high
Switch 2 - NCL switch - closed contacts on low flow, open on high
Maximum 24v ac-dc, 0.5A
Approximately 10 day delivery time.
£388.46 (£466.15 inc VAT)
75mm Flowmeter with two adjustable switching points
Ref: 2973
12-60 m3/h. Plain union PVC ends
Switch 1 - NCH switch - open contacts on low flow, closed on high
Switch 2 - NCL switch - closed contacts on low flow, open on high
Maximum 24v ac-dc, 0.5A
Approximately 10 day delivery time.
£388.46 (£466.15 inc VAT)
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