Type of Gas
Correction Factor
Air (specific gravity 1.0)
0.77
Propane (specific gravity 1.53)
0.63
1350 BTU Propane-Air Mixture
(specific gravity 1.20)
0.71
Nitrogen (specific gravity 0.97)
0.79
Dry CO
2
(specific gravity 1.52)
0.63
For other non-corrosive gases use the following formula:
0.60
Correction Factor =
Specific gravity of the gas
For use with gases not listed above, please contact your Sensus
representative or Industrial Distributor for recommendations.
Monitoring
The Model 441-57S Regulator makes an excellent monitor.
It can act as a standby regulator installed in series which
assumes control if a failure in the operating regulator
permits the outlet pressure to exceed the set-point. It can
be located in either the upstream or the downstream position.
When a Model 441-57S Regulator is used to monitor a
regulator with an identical inner valve (another 441-57S
Regulator), the
total maximum capacity
through both
regulators can be figured at 70% of the capacity of one
regulator alone. This applies with the monitor located either
upstream or downstream.
Models 441-57S Regulator
Installation and Maintenance Instructions
Limited Warranty
Seller warrants the Goods to be free from defects in materials manufactured by Seller and in Seller’s workmanship for a period of one (1) year after tender of delivery (the “Warranty Period"). THIS LIMITED WARRANTY
(a) IS IN LIEU OF, AND SELLER DISCLAIMS AND EXCLUDES ALL OTHER WARRANTIES, STATUTORY, EXPRESS OR IMPLIED, INCLUDING, WITH LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE, OR OF CONFORMITY TO MODELS OR SAMPLES; (b) does not apply to any Goods which have been (I) repaired, altered or improperly installed; (ii) subjected to improper use or storage,
(iii) used or incorporated with other materials or equipment, after buyer or anyone using the Goods has, or reasonably should have, knowledge of any defect or nonconformance of the Goods; or (iv) manufactured,
fabricated or assembled by anyone other than Seller, (c) shall not be effective unless buyer notifies Seller in writing of any purported defect or nonconformance with (thirty days) after Buyer discovers or should have
reasonably discovered such purported defect or nonconformance; and (d) shall only extend to Buyer and not to any subsequent buyers or users of the Goods. Buyer shall provide Seller access to the Goods as to which
Buyer claims a purported defect or nonconformance, upon request by Seller, buyer shall, at its own risk and expense, promptly return the Goods in question to Seller’s Plant.
© Sensus 2009
Made in USA
12/09
Maximum Emergency Pressure
The Maximum emergency pressure that the inlet side of the
Model 441-57S Regulator may be subjected to under abnormal
conditions without causing damage to the regulator is:
Cast Iron Body
Maximum Inlet Pr 25 psi
Ductile Iron Body
Maximum Inlet Pr 60 psi
Cast Steel Body
Maximum Inlet Pr 100 psi
If pressure exceeds the above values the regulator must be
removed from service and inspected. Damaged or otherwise
unsatisfactory parts must be repaired or replaced before return-
ing the regulator to service.
The maximum pressure which the diaphragm may be subjected
to under abnormal conditions without causing internal damage is
the set-point + 25 psi. If the pressure on the diaphragm exceeds
set-point by more than + 25 psi, the regulator must be removed
from service and inspected. Damaged or otherwise unsatisfactory
parts must be repaired or replaced before returning the regulator
to service. The set-point is the outlet pressure the regulator is
adjusted to deliver.
The maximum pressure that can be safely contained by the
diaphragm case is 175 psi. Safely contained means no leakage as
well as no bursting.
Before using any of the above data, make sure this entire section
is clearly understood.
Other Gases
The Model 441-57S Regulator is mainly used on natural gas serv-
ices; however, this regulator will perform equally as well on other
gases. When using the Model 441-57S Regulator on other gases,
the regulator capacities must be adjusted using the following cor-
rection factors:
Authorized Distributor:
8
05 Liberty Boulevard
DuBois, PA 15801
800-375-8875
Fax: (814) 375-8460
www.sensus.com/gas
